I have a Berkeley-db database where both 'key' and 'value' are of type integer. Is there any way to traverse the database in descending order of 'value'?
I'm using Berkeley-db je-5.0.58 API. The sample code that i'm using from its documentation is shown below.
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2004-2010 Oracle. All rights reserved.
*
*/
package je;
import java.io.File;
import com.sleepycat.bind.tuple.IntegerBinding;
import com.sleepycat.je.Cursor;
import com.sleepycat.je.Database;
import com.sleepycat.je.DatabaseConfig;
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.DatabaseException;
import com.sleepycat.je.Environment;
import com.sleepycat.je.EnvironmentConfig;
import com.sleepycat.je.LockMode;
import com.sleepycat.je.OperationStatus;
import com.sleepycat.je.Transaction;
/**
* SimpleExample creates a database environment, a database, and a database
* cursor, inserts and retrieves data.
*/
class SimpleExample {
private static final int EXIT_SUCCESS = 0;
private static final int EXIT_FAILURE = 1;
private int numRecords; // num records to insert or retrieve
private int offset; // where we want to start inserting
private boolean doInsert; // if true, insert, else retrieve
private File envDir;
public SimpleExample(int numRecords,
boolean doInsert,
File envDir,
int offset) {
this.numRecords = numRecords;
this.doInsert = doInsert;
this.envDir = envDir;
this.offset = offset;
}
/**
* Usage string
*/
public static void usage() {
System.out.println("usage: java " +
"je.SimpleExample " +
"<dbEnvHomeDirectory> " +
"<insert|retrieve> <numRecords> [offset]");
System.exit(EXIT_FAILURE);
}
/**
* Main
*/
public static void main(String argv[]) {
if (argv.length < 2) {
usage();
return;
}
File envHomeDirectory = new File(argv[0]);
boolean doInsertArg = false;
if (argv[1].equalsIgnoreCase("insert")) {
doInsertArg = true;
} else if (argv[1].equalsIgnoreCase("retrieve")) {
doInsertArg = false;
} else {
usage();
}
int startOffset = 0;
int numRecordsVal = 0;
if (doInsertArg) {
if (argv.length > 2) {
numRecordsVal = Integer.parseInt(argv[2]);
} else {
usage();
return;
}
if (argv.length > 3) {
startOffset = Integer.parseInt(argv[3]);
}
}
try {
SimpleExample app = new SimpleExample(numRecordsVal,
doInsertArg,
envHomeDirectory,
startOffset);
app.run();
} catch (DatabaseException e) {
e.printStackTrace();
System.exit(EXIT_FAILURE);
}
System.exit(EXIT_SUCCESS);
}
/**
* Insert or retrieve data
*/
public void run() throws DatabaseException {
/* Create a new, transactional database environment */
EnvironmentConfig envConfig = new EnvironmentConfig();
envConfig.setTransactional(true);
envConfig.setAllowCreate(true);
Environment exampleEnv = new Environment(envDir, envConfig);
/*
* Make a database within that environment
*
* Notice that we use an explicit transaction to
* perform this database open, and that we
* immediately commit the transaction once the
* database is opened. This is required if we
* want transactional support for the database.
* However, we could have used autocommit to
* perform the same thing by simply passing a
* null txn handle to openDatabase().
*/
Transaction txn = exampleEnv.beginTransaction(null, null);
DatabaseConfig dbConfig = new DatabaseConfig();
dbConfig.setTransactional(true);
dbConfig.setAllowCreate(true);
dbConfig.setSortedDuplicates(true);
Database exampleDb = exampleEnv.openDatabase(txn,
"simpleDb",
dbConfig);
txn.commit();
/*
* Insert or retrieve data. In our example, database records are
* integer pairs.
*/
/* DatabaseEntry represents the key and data of each record */
DatabaseEntry keyEntry = new DatabaseEntry();
DatabaseEntry dataEntry = new DatabaseEntry();
if (doInsert) {
/* put some data in */
for (int i = offset; i < numRecords + offset; i++) {
/*
* Note that autocommit mode, described in the Getting
* Started Guide, is an alternative to explicitly
* creating the transaction object.
*/
txn = exampleEnv.beginTransaction(null, null);
/* Use a binding to convert the int into a DatabaseEntry. */
IntegerBinding.intToEntry(i, keyEntry);
IntegerBinding.intToEntry(i+1, dataEntry);
OperationStatus status =
exampleDb.put(txn, keyEntry, dataEntry);
/*
* Note that put will throw a DatabaseException when
* error conditions are found such as deadlock.
* However, the status return conveys a variety of
* information. For example, the put might succeed,
* or it might not succeed if the record alread exists
* and the database was not configured for duplicate
* records.
*/
if (status != OperationStatus.SUCCESS) {
throw new RuntimeException("Data insertion got status " +
status);
}
txn.commit();
}
} else {
/* retrieve the data */
Cursor cursor = exampleDb.openCursor(null, null);
while (cursor.getNext(keyEntry, dataEntry, LockMode.DEFAULT) ==
OperationStatus.SUCCESS) {
System.out.println("key=" +
IntegerBinding.entryToInt(keyEntry) +
" data=" +
IntegerBinding.entryToInt(dataEntry));
}
cursor.close();
}
exampleDb.close();
exampleEnv.close();
}
}
you can use a custom comparator and use a cursor to traverse the data in descending order.
In java you have to implement a custom Comparator:
EDIT:
import java.util.Comparator;
import com.sleepycat.bind.tuple.IntegerBinding;
import com.sleepycat.je.DatabaseEntry;
public class IntegerSorter implements Comparator<byte[]>
{
#Override
public int compare(byte[] o1, byte[] o2)
{
return
IntegerBinding.entryToInt(new DatabaseEntry(o1)) -
IntegerBinding.entryToInt(new DatabaseEntry(o2));
}
}
(...)
dbConfig.setBtreeComparator(IntegerSorter.class);
(...)
Related
I have Escrypt Smart Card to sign data bytes and get signature and certificate for it.
I have java tool to do it and everything was fine until Java 8. Now application migrated to Java 11. And problem start from here.
SunPKCS11.jar/ library is not a part of Java 11, hence application breaks.
I tried with different solution available over internet and oracle release notes, it suggest to use java.security package for cryptographic operation.
I am not able to switch from Java 8 to java 11, any support would be really useful.
Edit-1: Minimum usable code
Signature calculator is used to parse signature
It is written with Java 8 & SunPKCS11.jar want to migrate it to Java 11
'''
import java.io.IOException;
import java.util.Scanner;
import javax.xml.bind.annotation.adapters.HexBinaryAdapter;
import sun.security.pkcs11.wrapper.CK_ATTRIBUTE;
import sun.security.pkcs11.wrapper.CK_MECHANISM;
import sun.security.pkcs11.wrapper.CK_RSA_PKCS_PSS_PARAMS;
import sun.security.pkcs11.wrapper.PKCS11;
import sun.security.pkcs11.wrapper.PKCS11Constants;
import sun.security.pkcs11.wrapper.PKCS11Exception;
public class Application {
public static void main(String[] args) {
try {
// PKCS11 middleware (UBK PKI) path
String libraryPath = "";
OpenScPkcs11 openScPkcs11 = new OpenScPkcs11(libraryPath);
openScPkcs11.login("", "");
byte[] hash = null;
String keypath = null;
String oid = null;
String authbits = null;
openScPkcs11.calcSign(hash, keypath, oid, authbits);
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class OpenScPkcs11 {
private static HexBinaryAdapter hexBinaryAdapter = new HexBinaryAdapter();
private int slotId = 0x3;
private String libraryPath;
private PKCS11 pkcs11Instance;
private String signatureAlgo = "RSA";
private long session = -1;
private boolean isLoginDone = false;
private SignatureMechanism.Algorithms algorithm = SignatureMechanism.Algorithms.SHA256;
public OpenScPkcs11(String libraryPath) throws IOException, PKCS11Exception {
this.libraryPath = libraryPath;
initializeMiddleware();
}
public void calcSign(byte[] hash, String keyPath, String userOid, String authbits) throws Exception {
byte[] signature = new byte[512];
if (this.pkcs11Instance != null) {
if (this.session < 0) {
this.openSession();
}
if (!this.isLoginDone) {
this.login("", "");
}
Mechanism mechanism = SignatureMechanism.getMechanism(this.algorithm);
CK_ATTRIBUTE[] pTemplate = new CK_ATTRIBUTE[3];
pTemplate[0] = new CK_ATTRIBUTE(PKCS11Constants.CKA_CLASS, PKCS11Constants.CKO_PRIVATE_KEY);
pTemplate[1] = new CK_ATTRIBUTE(PKCS11Constants.CKA_VENDOR_DEFINED + 1, keyPath);
pTemplate[2] = new CK_ATTRIBUTE(PKCS11Constants.CKA_VENDOR_DEFINED + 2, authbits);
// define the attibutes for certificate
CK_ATTRIBUTE[] certAttribute = new CK_ATTRIBUTE[1];
certAttribute[0] = new CK_ATTRIBUTE(PKCS11Constants.CKA_VENDOR_DEFINED + 3);
long[] c_FindObjects = null;
this.pkcs11Instance.C_FindObjectsInit(this.session, pTemplate);
c_FindObjects = this.pkcs11Instance.C_FindObjects(this.session, 32);
this.pkcs11Instance.C_FindObjectsFinal(this.session);
CK_MECHANISM pMechanism = null;
// RSA Algorithm
String signatureAlgorithmType = this.getSignatureAlgorithmType();
if (signatureAlgorithmType.equalsIgnoreCase("RSA")) {
pMechanism = new CK_MECHANISM(mechanism.getId());
CK_RSA_PKCS_PSS_PARAMS ck_RSA_PKCS_PSS_PARAMS =
new CK_RSA_PKCS_PSS_PARAMS(this.algorithm.name(), "MGF1", this.algorithm.name(), (int) mechanism.getsLen());
pMechanism.pParameter = ck_RSA_PKCS_PSS_PARAMS;
}
else if (signatureAlgorithmType.equalsIgnoreCase("ECDSA")) { // ECDSA Algorithm
pMechanism = new CK_MECHANISM(PKCS11Constants.CKM_ECDSA);
}
else {
throw new Exception("Signature algorithm " + signatureAlgorithmType + " is not supported");
}
if ((c_FindObjects != null) && (c_FindObjects.length > 0)) {
long c_FindObjectFound = c_FindObjects[0];
boolean objFound = false;
for (long c_FindObject : c_FindObjects) {
this.pkcs11Instance.C_GetAttributeValue(this.session, c_FindObject, certAttribute);
// Binary certificate as byte array
byte[] certificateBytes = certAttribute[0].getByteArray();
if ((userOid != null) && !userOid.isEmpty()) {
// Match certificate with userOid, if matches (Certificate parser used)
if (parseOidInfo(certificateBytes, userOid)) {
c_FindObjectFound = c_FindObject;
objFound = true;
break;
}
}
}
if (objFound) {
System.out.println("Signature found for given OID configuration.");
}
else {
this.pkcs11Instance.C_GetAttributeValue(this.session, c_FindObjectFound, certAttribute);
CertificateParser certificateParser = new CertificateParser(certAttribute[0].getByteArray());
}
this.pkcs11Instance.C_SignInit(this.session, pMechanism, c_FindObjectFound);
this.pkcs11Instance.C_SignUpdate(this.session, 0, hash, 0, (int) mechanism.getsLen());
signature = this.pkcs11Instance.C_SignFinal(this.session, mechanism.getSignFinalArgument());
}
else {
String errorMessage = "Unable to find keys.";
throw new Exception(errorMessage);
}
}
else {
throw new Exception("Initialize middleware first.");
}
}
/**
* #return
*/
private String getSignatureAlgorithmType() {
return this.signatureAlgo;
}
public void login(String userName, String password) throws Exception {
if (this.pkcs11Instance != null) {
openSession();
String pwd = password;
if (pwd == null || pwd.trim().isEmpty()) {
Scanner sc = new Scanner(System.in);
pwd = sc.next();
sc.close();
}
this.pkcs11Instance.C_Login(this.session, PKCS11Constants.CKU_USER, pwd.toCharArray());
this.isLoginDone = true;
}
else {
throw new Exception("Initialize middleware first.");
}
}
public void logout() throws PKCS11Exception {
if (this.pkcs11Instance != null) {
this.pkcs11Instance.C_Logout(this.session);
}
}
public void openSession() throws Exception {
if (this.pkcs11Instance != null) {
if (this.session < 0) {
long[] c_GetSlotList = this.pkcs11Instance.C_GetSlotList(true);
if ((c_GetSlotList != null) && (c_GetSlotList.length > 0)) {
for (long element : c_GetSlotList) {
if (element == this.slotId) {
this.session =
this.pkcs11Instance.C_OpenSession(this.slotId, PKCS11Constants.CKF_SERIAL_SESSION, null, null);
break;
}
}
}
}
}
else {
throw new Exception("Initialize middleware first.");
}
}
public void closeSession() throws PKCS11Exception {
if ((this.pkcs11Instance != null) && (this.session >= 0)) {
this.pkcs11Instance.C_CloseSession(this.session);
this.session = -1;
}
}
public void initializeMiddleware(String libraryPath1) throws IOException, PKCS11Exception {
this.pkcs11Instance = PKCS11.getInstance(libraryPath1, "C_GetFunctionList", null, false);
this.libraryPath = libraryPath1;
}
public void initializeMiddleware() throws IOException, PKCS11Exception {
this.pkcs11Instance = PKCS11.getInstance(this.libraryPath, "C_GetFunctionList", null, false);
}
public static String getString(final byte[] data) {
if ((data != null) && (data.length > 0)) {
return hexBinaryAdapter.marshal(data);
}
return null;
}
}
class SignatureMechanism {
public static enum Algorithms {
SHA256(0x250),
/**
* Hash calculation Algorithm
*/
RIPEMD160(0x240),
/**
* Hash calculation Algorithm
*/
RIPEMD160_1(0x0),
/**
* Secure Hash Algorithm 512 for hash Calculation
*/
SHA512(0x251);
private int value = 0;
private Algorithms(final int algorithmValue) {
this.value = algorithmValue;
}
/**
* #return the hash value
*/
public int getValue() {
return this.value;
}
}
/**
* #param algorithm : Algorithm used for hash calculation
* #return signature mechanism
*/
public static Mechanism getMechanism(final Algorithms algorithm) {
Mechanism mechanism = new Mechanism();
if (algorithm == Algorithms.SHA256) {
mechanism.setHashAlg(PKCS11Constants.CKM_SHA256);
mechanism.setMgf(PKCS11Constants.CKG_MGF1_SHA1 + 1);
mechanism.setsLen(32);
mechanism.setSignFinalArgument(512);
} // TODO Verify with ETAS Middleware team
else if (algorithm == Algorithms.SHA512) {
mechanism.setHashAlg(PKCS11Constants.CKM_SHA512);
mechanism.setMgf(PKCS11Constants.CKG_MGF1_SHA1 + 1);
mechanism.setsLen(64);
mechanism.setSignFinalArgument(1024);
}
else if (algorithm == Algorithms.RIPEMD160) {
mechanism.setHashAlg(PKCS11Constants.CKM_RIPEMD160);
mechanism.setMgf(0x80000001); // hard coded becuase it is defined by escrypt and not present in PKCS11
mechanism.setsLen(20);
}
else if (algorithm == Algorithms.RIPEMD160_1) {
mechanism.setId(PKCS11Constants.CKM_RIPEMD160_RSA_PKCS);
}
return mechanism;
}
}
class Mechanism{
private long hashAlg;
private long mgf;
private long sLen;
private long ulMaxObjectCount = 32;
private int signFinalArgument = 128;
private long id = PKCS11Constants.CKM_RSA_PKCS_PSS;
/**
* #return the hashAlg
*/
public long getHashAlg() {
return hashAlg;
}
/**
* #param hashAlg the hashAlg to set
*/
public void setHashAlg(long hashAlg) {
this.hashAlg = hashAlg;
}
/**
* #return the mgf
*/
public long getMgf() {
return mgf;
}
/**
* #param mgf the mgf to set
*/
public void setMgf(long mgf) {
this.mgf = mgf;
}
/**
* #return the sLen
*/
public long getsLen() {
return sLen;
}
/**
* #param sLen the sLen to set
*/
public void setsLen(long sLen) {
this.sLen = sLen;
}
/**
* #return the ulMaxObjectCount
*/
public long getUlMaxObjectCount() {
return ulMaxObjectCount;
}
/**
* #param ulMaxObjectCount the ulMaxObjectCount to set
*/
public void setUlMaxObjectCount(long ulMaxObjectCount) {
this.ulMaxObjectCount = ulMaxObjectCount;
}
/**
* #return the signFinalArgument
*/
public int getSignFinalArgument() {
return signFinalArgument;
}
/**
* #param signFinalArgument the signFinalArgument to set
*/
public void setSignFinalArgument(int signFinalArgument) {
this.signFinalArgument = signFinalArgument;
}
/**
* #return the id
*/
public long getId() {
return id;
}
/**
* #param id the id to set
*/
public void setId(long id) {
this.id = id;
}
}
'''
Thank You!
Java 9 up no longer puts the standard-library in jar files (rt.jar, etc) but they are still there. Your problem is probably (though I didn't read through all the code and certainly can't test without your hardware) that Java 9 up also introduces modules. Much as in Java forever your code can reference another class or interface (or static member therof) by its simple name only if you import it or it is in the same package as your code (if any) or the special package java.lang, now in 9 up you can only access a package if it is in the same module as your code or the special java.base module or your module and/or the other module explicitly allow the access; the explicit specification closet to older Java is an 'open'.
Thus the quick solution is to add to your java command (explicitly or via _JAVA_OPTS or equivalent) --add-opens jdk.crypto.cryptoki/sun.security.pkcs11.*=ALL-UNNAMED -- this should produce substantially the same result as running on 8 (or lower).
The official solution is to put your code in a module -- either by itself or with other related code -- that requires the (or each) needed module, given it exports the needed parts, which I haven't checked for yours. However, since your code apparently isn't even in a package yet, putting it in a module will be some work.
I am trying to import a class of a jar file.
I am able to import every class except one.
Here you can see the jar which contains all the classes I would like to import:
Here you can see the import, missing the HexoskinHTTPClient class:
The class itself looks as follows:
package com.companyname.hexoskin;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.companyname.hexoskin.models.HexoskinDataPoint;
import com.companyname.hexoskin.models.HexoskinRecord;
import com.companyname.hexoskin.models.HexoskinDatatype;
import com.companyname.hexoskin.models.HexoskinUnit;
import kong.unirest.Unirest;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.text.DecimalFormat;
import java.util.*;
class HexoskinHTTPClient {
private String host;
private String[] incompatibleDatatypes = {"8192", "8193", "8194", "1019", "54", "215", "281", "282", "283", "1053", "1049"};
/**
* Constructor
* #param host: The url of the API
*/
HexoskinHTTPClient(String host) {
this.host = host;
}
/**
* https://api.hexoskin.com/docs/resource/record
* #return ArrayList: List of records of type HexoskinRecord
* #throws IOException
*/
ArrayList<HexoskinRecord> getRecordsWithoutDetails() throws IOException {
// Fetch records
String response = Unirest.get(this.host + "record" + "?limit=0")
.basicAuth(HexoskinCredentials.user, HexoskinCredentials.password)
.asString()
.getBody();
// Get records array from response
ObjectMapper objectMapper = new ObjectMapper();
JsonNode records = objectMapper.readTree(response).get("objects");
// Extract relevant properties and create object
ArrayList<HexoskinRecord> hexoskinRecords = new ArrayList<>();
for(int i = 0; i < records.size(); i++) {
HexoskinRecord hexoskinRecord = objectMapper.readValue(records.get(i).toString(), HexoskinRecord.class);
hexoskinRecords.add(hexoskinRecord);
}
return hexoskinRecords;
}
/**
* https://api.hexoskin.com/docs/resource/datatype
* #return ArrayList: List of datatypes of type HexoskinDatatype
* #throws IOException
*/
ArrayList<HexoskinDatatype> getDatatypes() throws IOException, URISyntaxException {
// Fetch records
String response = Unirest.get(this.host + "datatype?limit=0")
.basicAuth(HexoskinCredentials.user, HexoskinCredentials.password)
.asString()
.getBody();
// Get datatypes array from response
ObjectMapper objectMapper = new ObjectMapper();
JsonNode datatypes = objectMapper.readTree(response).get("objects");
// Convert String Array to List
List<String> incompatibleDatatypesAsList = Arrays.asList(incompatibleDatatypes);
// Extract relevant properties and create object
ArrayList<HexoskinDatatype> hexoskinDatatypes = new ArrayList<>();
for(int i = 0; i < datatypes.size(); i++) {
// filter out incompatible types
if (!incompatibleDatatypesAsList.contains(datatypes.get(i).get("id").toString())) {
HexoskinDatatype hexoskinDatatype = objectMapper.readValue(datatypes.get(i).toString(), HexoskinDatatype.class);
// Get the unit id from unit uri
URI uri = new URI(hexoskinDatatype.getUnit());
String[] segments = uri.getPath().split("/");
String id = segments[segments.length - 1];
// Create the unit object
HexoskinUnit hexoskinUnit = this.getUnit(id);
hexoskinDatatype.setUnitObject(hexoskinUnit);
hexoskinDatatypes.add(hexoskinDatatype);
}
}
return hexoskinDatatypes;
}
/**
* https://api.hexoskin.com/docs/resource/unit
* #param unitToFetch: The id of the unit of which data should be fetched
* #return Hashmap: Map of units of type HexoskinUnit
* #throws IOException
*/
HexoskinUnit getUnit(String unitToFetch) throws IOException {
// Fetch records
String response = Unirest.get(this.host + "unit/" + unitToFetch)
.basicAuth(HexoskinCredentials.user, HexoskinCredentials.password)
.asString()
.getBody();
// Get unit from response
ObjectMapper objectMapper = new ObjectMapper();
JsonNode unit = objectMapper.readTree(response);
HexoskinUnit hexoskinUnit = objectMapper.readValue(unit.toString(), HexoskinUnit.class);
return hexoskinUnit;
}
/**
* https://api.hexoskin.com/docs/resource/data/
* #param recordId: The id of the record of which data should be fetched
* #param datatypes: The datatypes to fetch
* #return ArrayList: List of datapoints of type HexoskinDataPoint
* #throws IOException
*/
ArrayList<HexoskinDataPoint> getRecord(String recordId, ArrayList<HexoskinDatatype> datatypes) throws IOException {
String datatypesList = "";
for(int i = 0; i < datatypes.size(); i++) {
datatypesList += datatypes.get(i).getId();
if (i < datatypes.size() - 1) {
datatypesList += ",";
}
}
String response = Unirest.get(this.host + "data?datatype__in=" + datatypesList + "&record=" + recordId + "&limit=0")
.basicAuth(HexoskinCredentials.user, HexoskinCredentials.password)
.asString()
.getBody();
// Get data array from response
ObjectMapper objectMapper = new ObjectMapper();
JsonNode dataPointWrappers = objectMapper.readTree(response).get(0).get("data");
// Extract relevant properties and create object
ArrayList<HexoskinDataPoint> hexoskinDataPoints = new ArrayList<>();
for(int i = 0; i < datatypes.size(); i++) {
JsonNode dataPointWrapper = dataPointWrappers.get(datatypes.get(i).getId());
// Only create data points for entries with subentries
if (dataPointWrapper != null && dataPointWrapper.size() != 0) {
for(int j = 0; j < dataPointWrapper.size(); j++) {
HexoskinDataPoint hexoskinDataPoint = new HexoskinDataPoint(datatypes.get(i).getId());
if (dataPointWrapper.get(j).get(0) != null && !dataPointWrapper.get(j).get(0).toString().equals("null")) {
// Remove decimals which cause scientific notation strings
double secondNumber = Double.parseDouble(dataPointWrapper.get(j).get(0).toString());
DecimalFormat decimalFormat = new DecimalFormat("0");
String timestamp = decimalFormat.format(secondNumber);
hexoskinDataPoint.setTimestamp(timestamp);
} else {
hexoskinDataPoint.setTimestamp("NA");
}
if (dataPointWrapper.get(j).get(1) != null && !dataPointWrapper.get(j).get(1).toString().equals("null")) {
hexoskinDataPoint.setValue(dataPointWrapper.get(j).get(1).toString());
} else {
hexoskinDataPoint.setValue("NA");
}
hexoskinDataPoints.add(hexoskinDataPoint);
}
}
}
return hexoskinDataPoints;
}
/**
* Unirest starts a background event loop and your Java application won’t be able to exit
* until you manually shutdown all the threads.
*/
void destroy() {
Unirest.shutDown();
}
}
Do you have any idea why exactly one class (HexoskinHTTPClient) cannot be found?
As per my understanding "HexoskinHTTPClient" is not public class, this class declared with default package modified that's why this class not visible outside of package. make the class public i think it will work.
The images will not cache on internal storage and crashes on devices without an External SD Card. I have tried what I know and nothing worked. Here is the ImageCache.java
package com.minecraftpix.android.bitmapfun.util;
import com.minecraftpix.BuildConfig;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.os.Environment;
import android.os.StatFs;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.util.LruCache;
import android.util.Log;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.ref.SoftReference;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashSet;
import java.util.Iterator;
public class ImageCache {
private static final String TAG = "ImageCache";
// Default memory cache size in kilobytes
private static final int DEFAULT_MEM_CACHE_SIZE = 1024 * 5; // 5MB
// Default disk cache size in bytes
private static final int DEFAULT_DISK_CACHE_SIZE = 1024 * 1024 * 10; // 10MB
// Compression settings when writing images to disk cache
private static final CompressFormat DEFAULT_COMPRESS_FORMAT = CompressFormat.JPEG;
private static final int DEFAULT_COMPRESS_QUALITY = 70;
private static final int DISK_CACHE_INDEX = 0;
// Constants to easily toggle various caches
private static final boolean DEFAULT_MEM_CACHE_ENABLED = true;
private static final boolean DEFAULT_DISK_CACHE_ENABLED = true;
private static final boolean DEFAULT_INIT_DISK_CACHE_ON_CREATE = false;
private DiskLruCache mDiskLruCache;
private LruCache<String, BitmapDrawable> mMemoryCache;
private ImageCacheParams mCacheParams;
private final Object mDiskCacheLock = new Object();
private boolean mDiskCacheStarting = true;
private HashSet<SoftReference<Bitmap>> mReusableBitmaps;
/**
* Create a new ImageCache object using the specified parameters. This should not be
* called directly by other classes, instead use
* {#link ImageCache#getInstance(FragmentManager, ImageCacheParams)} to fetch an ImageCache
* instance.
*
* #param cacheParams The cache parameters to use to initialize the cache
*/
private ImageCache(ImageCacheParams cacheParams) {
init(cacheParams);
}
/**
* Return an {#link ImageCache} instance. A {#link RetainFragment} is used to retain the
* ImageCache object across configuration changes such as a change in device orientation.
*
* #param fragmentManager The fragment manager to use when dealing with the retained fragment.
* #param cacheParams The cache parameters to use if the ImageCache needs instantiation.
* #return An existing retained ImageCache object or a new one if one did not exist
*/
public static ImageCache getInstance(
FragmentManager fragmentManager, ImageCacheParams cacheParams) {
// Search for, or create an instance of the non-UI RetainFragment
final RetainFragment mRetainFragment = findOrCreateRetainFragment(fragmentManager);
// See if we already have an ImageCache stored in RetainFragment
ImageCache imageCache = (ImageCache) mRetainFragment.getObject();
// No existing ImageCache, create one and store it in RetainFragment
if (imageCache == null) {
imageCache = new ImageCache(cacheParams);
mRetainFragment.setObject(imageCache);
}
return imageCache;
}
/**
* Initialize the cache, providing all parameters.
*
* #param cacheParams The cache parameters to initialize the cache
*/
private void init(ImageCacheParams cacheParams) {
mCacheParams = cacheParams;
// Set up memory cache
if (mCacheParams.memoryCacheEnabled) {
if (BuildConfig.DEBUG) {
Log.d(TAG, "Memory cache created (size = " + mCacheParams.memCacheSize + ")");
}
// If we're running on Honeycomb or newer, then
if (Utils.hasHoneycomb()) {
mReusableBitmaps = new HashSet<SoftReference<Bitmap>>();
}
mMemoryCache = new LruCache<String, BitmapDrawable>(mCacheParams.memCacheSize) {
/**
* Notify the removed entry that is no longer being cached
*/
#Override
protected void entryRemoved(boolean evicted, String key,
BitmapDrawable oldValue, BitmapDrawable newValue) {
if (RecyclingBitmapDrawable.class.isInstance(oldValue)) {
// The removed entry is a recycling drawable, so notify it
// that it has been removed from the memory cache
((RecyclingBitmapDrawable) oldValue).setIsCached(false);
} else {
// The removed entry is a standard BitmapDrawable
if (Utils.hasHoneycomb()) {
// We're running on Honeycomb or later, so add the bitmap
// to a SoftRefrence set for possible use with inBitmap later
mReusableBitmaps.add(new SoftReference<Bitmap>(oldValue.getBitmap()));
}
}
}
/**
* Measure item size in kilobytes rather than units which is more practical
* for a bitmap cache
*/
#Override
protected int sizeOf(String key, BitmapDrawable value) {
final int bitmapSize = getBitmapSize(value) / 1024;
return bitmapSize == 0 ? 1 : bitmapSize;
}
};
}
// By default the disk cache is not initialized here as it should be initialized
// on a separate thread due to disk access.
if (cacheParams.initDiskCacheOnCreate) {
// Set up disk cache
initDiskCache();
}
}
/**
* Initializes the disk cache. Note that this includes disk access so this should not be
* executed on the main/UI thread. By default an ImageCache does not initialize the disk
* cache when it is created, instead you should call initDiskCache() to initialize it on a
* background thread.
*/
public void initDiskCache() {
// Set up disk cache
synchronized (mDiskCacheLock) {
if (mDiskLruCache == null || mDiskLruCache.isClosed()) {
File diskCacheDir = mCacheParams.diskCacheDir;
if (mCacheParams.diskCacheEnabled && diskCacheDir != null) {
if (!diskCacheDir.exists()) {
diskCacheDir.mkdirs();
}
if (getUsableSpace(diskCacheDir) > mCacheParams.diskCacheSize) {
try {
mDiskLruCache = DiskLruCache.open(
diskCacheDir, 1, 1, mCacheParams.diskCacheSize);
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache initialized");
}
} catch (final IOException e) {
mCacheParams.diskCacheDir = null;
Log.e(TAG, "initDiskCache - " + e);
}
}
}
}
mDiskCacheStarting = false;
mDiskCacheLock.notifyAll();
}
}
/**
* Adds a bitmap to both memory and disk cache.
* #param data Unique identifier for the bitmap to store
* #param value The bitmap drawable to store
*/
public void addBitmapToCache(String data, BitmapDrawable value) {
if (data == null || value == null) {
return;
}
// Add to memory cache
if (mMemoryCache != null) {
if (RecyclingBitmapDrawable.class.isInstance(value)) {
// The removed entry is a recycling drawable, so notify it
// that it has been added into the memory cache
((RecyclingBitmapDrawable) value).setIsCached(true);
}
mMemoryCache.put(data, value);
}
synchronized (mDiskCacheLock) {
// Add to disk cache
if (mDiskLruCache != null) {
final String key = hashKeyForDisk(data);
OutputStream out = null;
try {
DiskLruCache.Snapshot snapshot = mDiskLruCache.get(key);
if (snapshot == null) {
final DiskLruCache.Editor editor = mDiskLruCache.edit(key);
if (editor != null) {
out = editor.newOutputStream(DISK_CACHE_INDEX);
value.getBitmap().compress(
mCacheParams.compressFormat, mCacheParams.compressQuality, out);
editor.commit();
out.close();
}
} else {
snapshot.getInputStream(DISK_CACHE_INDEX).close();
}
} catch (final IOException e) {
Log.e(TAG, "addBitmapToCache - " + e);
} catch (Exception e) {
Log.e(TAG, "addBitmapToCache - " + e);
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {}
}
}
}
}
/**
* Get from memory cache.
*
* #param data Unique identifier for which item to get
* #return The bitmap drawable if found in cache, null otherwise
*/
public BitmapDrawable getBitmapFromMemCache(String data) {
BitmapDrawable memValue = null;
if (mMemoryCache != null) {
memValue = mMemoryCache.get(data);
}
if (BuildConfig.DEBUG && memValue != null) {
Log.d(TAG, "Memory cache hit");
}
return memValue;
}
/**
* Get from disk cache.
*
* #param data Unique identifier for which item to get
* #return The bitmap if found in cache, null otherwise
*/
public Bitmap getBitmapFromDiskCache(String data) {
final String key = hashKeyForDisk(data);
Bitmap bitmap = null;
synchronized (mDiskCacheLock) {
while (mDiskCacheStarting) {
try {
mDiskCacheLock.wait();
} catch (InterruptedException e) {}
}
if (mDiskLruCache != null) {
InputStream inputStream = null;
try {
final DiskLruCache.Snapshot snapshot = mDiskLruCache.get(key);
if (snapshot != null) {
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache hit");
}
inputStream = snapshot.getInputStream(DISK_CACHE_INDEX);
if (inputStream != null) {
FileDescriptor fd = ((FileInputStream) inputStream).getFD();
// Decode bitmap, but we don't want to sample so give
// MAX_VALUE as the target dimensions
bitmap = ImageResizer.decodeSampledBitmapFromDescriptor(
fd, Integer.MAX_VALUE, Integer.MAX_VALUE, this);
}
}
} catch (final IOException e) {
Log.e(TAG, "getBitmapFromDiskCache - " + e);
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e) {}
}
}
return bitmap;
}
}
/**
* #param options - BitmapFactory.Options with out* options populated
* #return Bitmap that case be used for inBitmap
*/
protected Bitmap getBitmapFromReusableSet(BitmapFactory.Options options) {
Bitmap bitmap = null;
if (mReusableBitmaps != null && !mReusableBitmaps.isEmpty()) {
final Iterator<SoftReference<Bitmap>> iterator = mReusableBitmaps.iterator();
Bitmap item;
while (iterator.hasNext()) {
item = iterator.next().get();
if (null != item && item.isMutable()) {
// Check to see it the item can be used for inBitmap
if (canUseForInBitmap(item, options)) {
bitmap = item;
// Remove from reusable set so it can't be used again
iterator.remove();
break;
}
} else {
// Remove from the set if the reference has been cleared.
iterator.remove();
}
}
}
return bitmap;
}
/**
* Clears both the memory and disk cache associated with this ImageCache object. Note that
* this includes disk access so this should not be executed on the main/UI thread.
*/
public void clearCache() {
if (mMemoryCache != null) {
mMemoryCache.evictAll();
if (BuildConfig.DEBUG) {
Log.d(TAG, "Memory cache cleared");
}
}
synchronized (mDiskCacheLock) {
mDiskCacheStarting = true;
if (mDiskLruCache != null && !mDiskLruCache.isClosed()) {
try {
mDiskLruCache.delete();
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache cleared");
}
} catch (IOException e) {
Log.e(TAG, "clearCache - " + e);
}
mDiskLruCache = null;
initDiskCache();
}
}
}
/**
* Flushes the disk cache associated with this ImageCache object. Note that this includes
* disk access so this should not be executed on the main/UI thread.
*/
public void flush() {
synchronized (mDiskCacheLock) {
if (mDiskLruCache != null) {
try {
mDiskLruCache.flush();
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache flushed");
}
} catch (IOException e) {
Log.e(TAG, "flush - " + e);
}
}
}
}
/**
* Closes the disk cache associated with this ImageCache object. Note that this includes
* disk access so this should not be executed on the main/UI thread.
*/
public void close() {
synchronized (mDiskCacheLock) {
if (mDiskLruCache != null) {
try {
if (!mDiskLruCache.isClosed()) {
mDiskLruCache.close();
mDiskLruCache = null;
if (BuildConfig.DEBUG) {
Log.d(TAG, "Disk cache closed");
}
}
} catch (IOException e) {
Log.e(TAG, "close - " + e);
}
}
}
}
/**
* A holder class that contains cache parameters.
*/
public static class ImageCacheParams {
public int memCacheSize = DEFAULT_MEM_CACHE_SIZE;
public int diskCacheSize = DEFAULT_DISK_CACHE_SIZE;
public File diskCacheDir;
public CompressFormat compressFormat = DEFAULT_COMPRESS_FORMAT;
public int compressQuality = DEFAULT_COMPRESS_QUALITY;
public boolean memoryCacheEnabled = DEFAULT_MEM_CACHE_ENABLED;
public boolean diskCacheEnabled = DEFAULT_DISK_CACHE_ENABLED;
public boolean initDiskCacheOnCreate = DEFAULT_INIT_DISK_CACHE_ON_CREATE;
/**
* Create a set of image cache parameters that can be provided to
* {#link ImageCache#getInstance(FragmentManager, ImageCacheParams)} or
* {#link ImageWorker#addImageCache(FragmentManager, ImageCacheParams)}.
* #param context A context to use.
* #param diskCacheDirectoryName A unique subdirectory name that will be appended to the
* application cache directory. Usually "cache" or "images"
* is sufficient.
*/
public ImageCacheParams(Context context, String diskCacheDirectoryName) {
diskCacheDir = getDiskCacheDir(context, diskCacheDirectoryName);
}
/**
* Sets the memory cache size based on a percentage of the max available VM memory.
* Eg. setting percent to 0.2 would set the memory cache to one fifth of the available
* memory. Throws {#link IllegalArgumentException} if percent is < 0.05 or > .8.
* memCacheSize is stored in kilobytes instead of bytes as this will eventually be passed
* to construct a LruCache which takes an int in its constructor.
*
* This value should be chosen carefully based on a number of factors
* Refer to the corresponding Android Training class for more discussion:
* http://developer.android.com/training/displaying-bitmaps/
*
* #param percent Percent of available app memory to use to size memory cache
*/
public void setMemCacheSizePercent(float percent) {
if (percent < 0.05f || percent > 0.8f) {
throw new IllegalArgumentException("setMemCacheSizePercent - percent must be "
+ "between 0.05 and 0.8 (inclusive)");
}
memCacheSize = Math.round(percent * Runtime.getRuntime().maxMemory() / 1024);
}
}
/**
* #param candidate - Bitmap to check
* #param targetOptions - Options that have the out* value populated
* #return true if <code>candidate</code> can be used for inBitmap re-use with
* <code>targetOptions</code>
*/
private static boolean canUseForInBitmap(
Bitmap candidate, BitmapFactory.Options targetOptions) {
int width = targetOptions.outWidth / targetOptions.inSampleSize;
int height = targetOptions.outHeight / targetOptions.inSampleSize;
return candidate.getWidth() == width && candidate.getHeight() == height;
}
/**
* Get a usable cache directory (external if available, internal otherwise).
*
* #param context The context to use
* #param uniqueName A unique directory name to append to the cache dir
* #return The cache dir
*/
public static File getDiskCacheDir(Context context, String uniqueName) {
// Check if media is mounted or storage is built-in, if so, try and use external cache dir
// otherwise use internal cache dir
final String cachePath =
Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
!isExternalStorageRemovable() ? getExternalCacheDir(context).getPath() :
context.getCacheDir().getPath();
return new File(cachePath + File.separator + uniqueName);
}
/**
* A hashing method that changes a string (like a URL) into a hash suitable for using as a
* disk filename.
*/
public static String hashKeyForDisk(String key) {
String cacheKey;
try {
final MessageDigest mDigest = MessageDigest.getInstance("MD5");
mDigest.update(key.getBytes());
cacheKey = bytesToHexString(mDigest.digest());
} catch (NoSuchAlgorithmException e) {
cacheKey = String.valueOf(key.hashCode());
}
return cacheKey;
}
private static String bytesToHexString(byte[] bytes) {
// http://stackoverflow.com/questions/332079
StringBuilder sb = new StringBuilder();
for (int i = 0; i < bytes.length; i++) {
String hex = Integer.toHexString(0xFF & bytes[i]);
if (hex.length() == 1) {
sb.append('0');
}
sb.append(hex);
}
return sb.toString();
}
/**
* Get the size in bytes of a bitmap in a BitmapDrawable.
* #param value
* #return size in bytes
*/
#TargetApi(12)
public static int getBitmapSize(BitmapDrawable value) {
Bitmap bitmap = value.getBitmap();
if (Utils.hasHoneycombMR1()) {
return bitmap.getByteCount();
}
// Pre HC-MR1
return bitmap.getRowBytes() * bitmap.getHeight();
}
/**
* Check if external storage is built-in or removable.
*
* #return True if external storage is removable (like an SD card), false
* otherwise.
*/
#TargetApi(9)
public static boolean isExternalStorageRemovable() {
if (Utils.hasGingerbread()) {
return Environment.isExternalStorageRemovable();
}
return true;
}
/**
* Get the external app cache directory.
*
* #param context The context to use
* #return The external cache dir
*/
#TargetApi(8)
public static File getExternalCacheDir(Context context) {
if (Utils.hasFroyo()) {
return context.getExternalCacheDir();
}
// Before Froyo we need to construct the external cache dir ourselves
final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
}
/**
* Check how much usable space is available at a given path.
*
* #param path The path to check
* #return The space available in bytes
*/
#TargetApi(9)
public static long getUsableSpace(File path) {
if (Utils.hasGingerbread()) {
return path.getUsableSpace();
}
final StatFs stats = new StatFs(path.getPath());
return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
}
/**
* Locate an existing instance of this Fragment or if not found, create and
* add it using FragmentManager.
*
* #param fm The FragmentManager manager to use.
* #return The existing instance of the Fragment or the new instance if just
* created.
*/
private static RetainFragment findOrCreateRetainFragment(FragmentManager fm) {
// Check to see if we have retained the worker fragment.
RetainFragment mRetainFragment = (RetainFragment) fm.findFragmentByTag(TAG);
// If not retained (or first time running), we need to create and add it.
if (mRetainFragment == null) {
mRetainFragment = new RetainFragment();
fm.beginTransaction().add(mRetainFragment, TAG).commitAllowingStateLoss();
}
return mRetainFragment;
}
/**
* A simple non-UI Fragment that stores a single Object and is retained over configuration
* changes. It will be used to retain the ImageCache object.
*/
public static class RetainFragment extends Fragment {
private Object mObject;
/**
* Empty constructor as per the Fragment documentation
*/
public RetainFragment() {}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Make sure this Fragment is retained over a configuration change
setRetainInstance(true);
}
/**
* Store a single object in this Fragment.
*
* #param object The object to store
*/
public void setObject(Object object) {
mObject = object;
}
/**
* Get the stored object.
*
* #return The stored object
*/
public Object getObject() {
return mObject;
}
}
}
And here is the stack trace from Google Developer Console
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.minecraftpix/com.minecraftpix.pics.ImageGridActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
at android.app.ActivityThread.access$2300(ActivityThread.java:125)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:4627)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:521)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.minecraftpix.android.bitmapfun.util.ImageCache.getDiskCacheDir(ImageCache.java:514)
at com.minecraftpix.android.bitmapfun.util.ImageCache$ImageCacheParams.<init>(ImageCache.java:463)
at com.minecraftpix.pics.ImageGridFragment.onCreate(ImageGridFragment.java:80)
at android.support.v4.app.Fragment.performCreate(Fragment.java:1437)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:877)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1131)
at android.app.Activity.performStart(Activity.java:3781)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2636)
... 11 more
This:
Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ||
!isExternalStorageRemovable() ?
getExternalCacheDir(context).getPath() : context.getCacheDir().getPath();
is suspect, the !isExternalStorageRemovable() check overrides the MEDIA_MOUNTED check. Just because external storage is not removable, does not mean it cannot be unmounted. For example, on older versions of android, the default behavior was to mount the external storage as USB mass storage on the host computer. This would unmount it and make it unavailable to your application, regardless of whether the storage media could be physically removed or not.
In the case that external storage was not removable, yet not mounted, getExternalCacheDir() will return null.
This is assuming that context is non-null as well.
Try this..
if(android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
//some stuff
}
We have a Lotus Notes Plug-In, developed in Java. The current version of Notes we're supporting is 8.5.2.
This plug-in adds a button to the Notes UI. When the user clicks it, we present a window to the user, which allows the user to add the current item to our web-based application using web services. Everything works fine, except when the user tries to add a new email item.
The listener for the "click event" (if you will) needs to know the current document so that it can pass its field data to the web service call. In order to do that, a separate listener has been set up (DocumentContextService) which essentially gets invoked any time the input focus changes within the Notes UI.
DocumentContextService attempts to retrieve the URI of the current document. And that's where things fall apart. I am finding that an unsent email message has no URI. Further, there appears to be no way to get to the document and save it, so that I can obtain one.
Theoretically, this is by design. Oddly, I can see that the new document has a DocumentKey, so I know it exists (as a draft somewhere), but I cannot get to it. So there doesn't appear to be any way to access the document's data until it is actually saved.
Unless I'm wrong (and I very well could be). And there's the question: Is there a way to obtain the underlying document of a new email before it has been saved so that I can access its data (specifically, its fields)?
The code from the document context listener is below. The problem, again, is that the URI property always evaluates to an empty string for new emails.
package com.ibm.lotuslabs.context.service.internal;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Properties;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.model.IWorkbenchAdapter;
import org.eclipse.ui.views.properties.IPropertyDescriptor;
import org.eclipse.ui.views.properties.IPropertySource;
import com.ibm.lotuslabs.context.service.document.IDocumentContext;
import com.ibm.rcp.jface.launcher.IURIProvider;
import com.satuit.sys.The;
/**
* Extracts document information about about a selection object. Represents the document within the DocumentSelection.
*/
#SuppressWarnings("deprecation")
public class DocumentContext implements IDocumentContext
{
private IWorkbenchPart part;
private Object obj;
private String label;
private URI uri;
private ImageDescriptor icon;
private Properties properties;
private String id;
/**
* Initializes a new instance of the DocumentContext class.
*
* #param part The current view part.
* #param obj The currently selected object.
*/
public DocumentContext(final IWorkbenchPart part, final Object obj)
{
this.part = part;
this.obj = obj;
// Is this object a URIProvider?
final IURIProvider provider = (IURIProvider)ContextUtil.getAdapterObject(obj, IURIProvider.class);
if (provider != null)
{
this.uri = provider.getURI();
this.label = provider.getTitle();
this.icon = provider.getImageDescriptor();
}
if (this.label == null || this.icon == null)
{
// Is this object a workbench adapter?
final IWorkbenchAdapter wba = (IWorkbenchAdapter)ContextUtil.getAdapterObject(obj, IWorkbenchAdapter.class);
if (wba != null)
{
if (this.label != null)
{
this.label = wba.getLabel(obj);
}
if (this.icon != null)
{
this.icon = wba.getImageDescriptor(obj);
}
}
if (this.icon == null)
{
final Image i = part.getTitleImage();
if (i != null)
{
this.icon = ImageDescriptor.createFromImage(i);
}
}
}
// Is this object a URI?
if (this.uri == null)
{
this.uri = (URI)ContextUtil.getAdapterObject(obj, URI.class);
}
// Is this object a PropertySource?
// (A document that isn't a URI provider may provide a URI in its properties.)
final IPropertySource prop = (IPropertySource)ContextUtil.getAdapterObject(obj, IPropertySource.class);
if (prop != null)
{
this.properties = buildProperties(prop);
}
}
/**
* Gets the ID of this instance.
* #return A string containing the ID.
*/
public final String getId()
{
return this.id;
}
/**
* Gets the workbench part used to initialize this instance.
* #return
*/
public final IWorkbenchPart getPart()
{
return this.part;
}
/* (non-Javadoc)
* #see com.ibm.lotuslabs.context.service.document.IDocumentContext#getImageDescriptor()
*/
public final ImageDescriptor getImageDescriptor()
{
return this.icon;
}
/* (non-Javadoc)
* #see com.ibm.lotuslabs.context.service.document.IDocumentContext#getLabel()
*/
public final String getLabel()
{
if (this.label == null && this.part != null)
{
return this.part.getTitle();
}
return this.label;
}
/* (non-Javadoc)
* #see com.ibm.lotuslabs.context.service.document.IDocumentContext#getObject()
*/
public final Object getObject()
{
return this.obj;
}
/* (non-Javadoc)
* #see com.ibm.lotuslabs.context.service.document.IDocumentContext#getProperties()
*/
public final Properties getProperties()
{
return this.properties;
}
/* (non-Javadoc)
* #see com.ibm.lotuslabs.context.service.document.IDocumentContext#getURI()
*/
public final URI getURI()
{
return this.uri;
}
private Properties buildProperties(final IPropertySource source)
{
if (source == null)
{
return null;
}
final IPropertyDescriptor[] descs = source.getPropertyDescriptors();
if (The.Value(null).Is.NullOrEmpty(descs))
{
return null;
}
final Properties prop = new Properties();
for (int i = 0; i < descs.length; i++)
{
final Object id = descs[i].getId();
final String name = descs[i].getDisplayName();
String value = source.getPropertyValue(descs[i].getId()).toString();
if (The.Value(descs[i].getDescription()).Is.Not.Null())
{
value += "|" + source.getPropertyValue(descs[i].getDescription()).toString();
}
if (this.uri == null)
{
if (The.Value("URI").Is.OneOfIgnoreCase(id.toString(), name) ||
The.Value("URL").Is.OneOfIgnoreCase(id.toString(), name))
{
try
{
this.uri = new URI(value);
continue;
}
catch (URISyntaxException e)
{
}
}
}
prop.setProperty(name, value);
}
return prop;
}
}
Sorry, until the document is saved into the backend database, there is no document to get an URI for, as it does not exists anywhere but in memory. It simply does not exists on disk.
I have a couple of questions about a school project I'm working on. The code is as follows.
public class Player
{
private PlayList playList;
private Track track;
private int tracksPlayed;
private int totalTrackTime;
private double averageTrackTime;
/**
* Constructor ...
*/
public Player()
{
playList = new PlayList("audio");
track = playList.getTrack(0);
this.tracksPlayed = tracksPlayed;
this.totalTrackTime = totalTrackTime;
this.averageTrackTime = averageTrackTime;
}
/**
* Return the track collection currently loaded in this player.
*/
public PlayList getPlayList()
{
return playList;
}
/**
*
*/
public void play()
{
track.play();
tracksPlayed++;
int trackDuration = track.getDuration();
totalTrackTime = totalTrackTime + trackDuration;
averageTrackTime = totalTrackTime / tracksPlayed;
}
/**
*
*/
public void stop()
{
track.stop();
}
/**
*
*/
public void setTrack(int trackNumber)
{
int currentTrack = trackNumber;
track = playList.getTrack(currentTrack);
}
/**
*
*/
public String getTrackName()
{
String currentTrack = track.getName();
return currentTrack;
}
/**
*
*/
public String getTrackInfo()
{
String currentTrack = track.getName();
int trackDuration = track.getDuration();
return currentTrack + " " + "(" + trackDuration + ")";
}
/**
*
*/
public int getNumberOfTracksPlayed()
{
return tracksPlayed;
}
/**
*
*/
public int getTotalPlayedTrackLength()
{
return totalTrackTime;
}
/**
*
*/
public double averageTrackLength()
{
return averageTrackTime;
}
}
public class Track
{
private Clip soundClip;
private String name;
/**
* Create a track from an audio file.
*/
public Track(File soundFile)
{
soundClip = loadSound(soundFile);
name = soundFile.getName();
}
/**
* Play this sound track. (The sound will play asynchronously, until
* it is stopped or reaches the end.)
*/
public void play()
{
if(soundClip != null) {
soundClip.start();
}
}
/**
* Stop this track playing. (This method has no effect if the track is not
* currently playing.)
*/
public void stop()
{
if(soundClip != null) {
soundClip.stop();
}
}
/**
* Reset this track to its start.
*/
public void rewind()
{
if(soundClip != null) {
soundClip.setFramePosition(0);
}
}
/**
* Return the name of this track.
*/
public String getName()
{
return name;
}
/**
* Return the duration of this track, in seconds.
*/
public int getDuration()
{
if (soundClip == null) {
return 0;
}
else {
return (int) soundClip.getMicrosecondLength()/1000000;
}
}
/**
* Set the playback volume of the current track.
*
* #param vol Volume level as a percentage (0..100).
*/
public void setVolume(int vol)
{
if(soundClip == null) {
return;
}
if(vol < 0 || vol > 100) {
vol = 100;
}
double val = vol / 100.0;
try {
FloatControl volControl =
(FloatControl) soundClip.getControl(FloatControl.Type.MASTER_GAIN);
float dB = (float)(Math.log(val == 0.0 ? 0.0001 : val) / Math.log(10.0) * 20.0);
volControl.setValue(dB);
} catch (Exception ex) {
System.err.println("Error: could not set volume");
}
}
/**
* Return true if this track has successfully loaded and can be played.
*/
public boolean isValid()
{
return soundClip != null;
}
/**
* Load the sound file supplied by the parameter.
*
* #return The sound clip if successful, null if the file could not be decoded.
*/
private Clip loadSound(File file)
{
Clip newClip;
try {
AudioInputStream stream = AudioSystem.getAudioInputStream(file);
AudioFormat format = stream.getFormat();
// we cannot play ALAW/ULAW, so we convert them to PCM
//
if ((format.getEncoding() == AudioFormat.Encoding.ULAW) ||
(format.getEncoding() == AudioFormat.Encoding.ALAW))
{
AudioFormat tmp = new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
format.getSampleRate(),
format.getSampleSizeInBits() * 2,
format.getChannels(),
format.getFrameSize() * 2,
format.getFrameRate(),
true);
stream = AudioSystem.getAudioInputStream(tmp, stream);
format = tmp;
}
DataLine.Info info = new DataLine.Info(Clip.class,
stream.getFormat(),
((int) stream.getFrameLength() *
format.getFrameSize()));
newClip = (Clip) AudioSystem.getLine(info);
newClip.open(stream);
return newClip;
} catch (Exception ex) {
return null;
}
}
}
public class PlayList
{
private List<Track> tracks;
/**
* Constructor for objects of class TrackCollection
*/
public PlayList(String directoryName)
{
tracks = loadTracks(directoryName);
}
/**
* Return a track from this collection.
*/
public Track getTrack(int trackNumber)
{
return tracks.get(trackNumber);
}
/**
* Return the number of tracks in this collection.
*/
public int numberOfTracks()
{
return tracks.size();
}
/**
* Load the file names of all files in the given directory.
* #param dirName Directory (folder) name.
* #param suffix File suffix of interest.
* #return The names of files found.
*/
private List<Track> loadTracks(String dirName)
{
File dir = new File(dirName);
if(dir.isDirectory()) {
File[] allFiles = dir.listFiles();
List<Track> foundTracks = new ArrayList<Track>();
for(File file : allFiles) {
//System.out.println("found: " + file);
Track track = new Track(file);
if(track.isValid()) {
foundTracks.add(track);
}
}
return foundTracks;
}
else {
System.err.println("Error: " + dirName + " must be a directory");
return null;
}
}
/**
* Return this playlist as an array of strings with the track names.
*/
public String[] asStrings()
{
String[] names = new String[tracks.size()];
int i = 0;
for(Track track : tracks) {
names[i++] = track.getName();
}
return names;
}
}
I understand that to call the play methods in the player class, I have to initialize a Track class variable. I also need to initialize it using the PlayList getTrack method. However, how can I initialize it without defining a starting index variable (i.e I don't want it to automatically initialize to a specific song in the index, I want the user to have to select a song first)?
Also, how do I code the play method in the player class to stop a existing song if one is playing before starting a new song and to restart a song if the play method is called again one the same song?
1.
how can I initialize it without defining a starting index variable
public Player (int initTrack){
...
track = playList.getTrack(initTrack);
...
}
2.
You should try with a field storing the track that it is currently playing!