Develop Reference

PrintWriter printing "line.separator" twice in file

I have a method called saveAgendaDataArrayList() which is suposed to save the data from an ArrayList in a TXT file as following.
public void saveAgendaDataArrayList(String path, ArrayList<Contact> agendaDataArrayList) {
try {
if(agendaDataArrayList!=null) {
File file = new File(path);
PrintWriter p = new PrintWriter(file);
int count = agendaDataArrayList.size();
for(int i=0; i<count; i++) {
Contact temp = new Contact();
temp = agendaDataArrayList.get(i);
p.println(temp.getIdAdress()+";"+temp.getContactType()+";"+temp.getName()+";"+temp.getBirthdayDay()+
";"+temp.getBirthdayMonth()+";"+temp.getBirthdayYear()+";"+temp.getTel1()+";"+temp.getTel2()+
";"+temp.getNeigborhood()+";"+temp.getAddress()+";"+temp.getCep()+";"+temp.getEmail()
+";"+temp.getOtherInformation()+";"+temp.getCreationDate()+";");
}
p.close();
} else {
File file = new File(path);
PrintWriter p = new PrintWriter(file);
p.print("empty agenda");
p.close();
}
} catch (IOException e) {
e.printStackTrace();
}
However, when it runs, I have some new lines coming from I don't know where. Look below.
1;1;Guilhermee;00;00;;8666666;;sem bairro;;;;;12-09-2019 04:45:47;
2;1;Gabriella;00;00;;;;Morada do Sol;;;;;12-09-2019 04:45:57;
3;1;joao;00;00;;;;sem bairro;;;;;12-09-2019 05:38:13;
4;1;lua;00;00;;;;sem bairro;;;;;12-09-2019 06:11:15;
5;1;roberto;00;00;;;;sem bairro;;;;;12-09-2019 06:12:22;
6;1;joquina;00;00;;;;Monte Verde;;;;;12-09-2019 07:38:30;
7;1;luan silva;00;00;;;;sem bairro;;;;;12-09-2019 07:40:07;
8;1;manoel;00;00;;89898989;;sem bairro;asdasd;;;;12-09-2019 07:44:44;
9;1;joana;19;01;1954;;;Cidade Jardim;;;;;12-09-2019 07:48:03;
10;1;mariana;00;00;;;;sem bairro;;;;;12-09-2019 07:57:43;
11;1;agoradeucerto;00;00;;;;Morros;;;;;12-09-2019 08:01:46;
12;1;mais uma tentativa;00;00;;;;sem bairro;;;;;12-09-2019 08:43:19;
I'd like to have an output file as above, but without the empty lines.
I tried to see if the same would happen in console with the method System.out.println(), and it happened there too.
Looking in a text file editor, the Notepad, I noticed there are some LF mixed with CR LF in the end of lines.
I've reviewed the Contact class and all seems to be right.
So, what could I do to reach that result and avoid those empty lines, and why only the last line is in the correct place?
Thank you for your time.
EDIT 1 - The input method
Here is the input method. There are 2 ways to add the data into agendaDataArrayList. The first one is through reading a txt file (1st method) and the second one, through an input interface (2nd method).
1st method
public ArrayList<Contact> getAgendaDataArrayList(String path) {
try {
FileReader reader = new FileReader(path);
Scanner scanner1 = new Scanner(reader);
scanner1.useDelimiter("\r\n|\n");
int count = 0;
while(scanner1.hasNext()) {
scanner1.next();
count++;
}
System.out.println(count);
scanner1.close();
reader.close();
ArrayList<Contact> agendaDataArrayList = new ArrayList<Contact>();
FileReader reader2 = new FileReader(path);
Scanner scanner2 = new Scanner(reader2);
scanner2.useDelimiter(";");
for(int i=0; i<count; i++) {
Contact temp = new Contact();
temp.setIdAdress(scanner2.next()); //[0] id
temp.setContactType(scanner2.next()); //[1] type
temp.setName(scanner2.next()); //[2] name
temp.setBirthdayDay(scanner2.next()); //[3] birthdayDay
temp.setBirthdayMonth(scanner2.next()); //[4] birthdayMonth
temp.setBirthdayYear(scanner2.next()); //[5] birthdayYear
temp.setTel1(scanner2.next()); //[6] tel1
temp.setTel2(scanner2.next()); //[7] tel2
temp.setNeigborhood(scanner2.next()); //[8] neighborhood
temp.setAddress(scanner2.next()); //[9] address
temp.setCep(scanner2.next()); //[10] cep
temp.setEmail(scanner2.next()); //[11] email
temp.setOtherInformation(scanner2.next()); //[12] other information
temp.setCreationDate(scanner2.next()); //[13] creation date
agendaDataArrayList.add(temp);
}
scanner2.close();
reader2.close();
return agendaDataArrayList;
} catch (IOException e) {
e.printStackTrace();
ArrayList<Contact> agendaDataArrayList = new ArrayList<Contact>();
return agendaDataArrayList;
}
}
2nd method
public void saveActionButton() {
Date creationDate = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
Contact newContact = new Contact();
newContact.setIdAdress(mainApp.getNextIdAddress());
if(typeChoiceBox.getValue()==null) {
newContact.setContactType("1");
} else {
newContact.setContactType(typeChoiceBox.getValue());
}
if(nameTextField.getText()==null) {
newContact.setName("sem nome");
} else {
newContact.setName(nameTextField.getText());
}
if(dayChoiceBox.getValue()==null) {
newContact.setBirthdayDay("00");
}else {
newContact.setBirthdayDay(dayChoiceBox.getValue());
}
if(monthChoiceBox.getValue()==null) {
newContact.setBirthdayMonth("00");
}else {
newContact.setBirthdayMonth(monthChoiceBox.getValue());
}
if(yearTextField.getText()==null) {
newContact.setBirthdayYear("0000");
}else {
newContact.setBirthdayYear(yearTextField.getText());
}
if(tel1TextField.getText()==null) {
newContact.setTel1("sem número");
}else {
newContact.setTel1(tel1TextField.getText());
}
if(tel2TextField.getText()==null) {
newContact.setTel2("sem número");
}else {
newContact.setTel2(tel2TextField.getText());
}
if(neighborhoodChoiceBox.getValue()==null) {
newContact.setNeigborhood("sem bairro");
} else {
newContact.setNeigborhood(neighborhoodChoiceBox.getValue());
}
if(addressTextField.getText()==null) {
newContact.setAddress("sem endereço");
} else {
newContact.setAddress(addressTextField.getText());
}
if(cepTextField.getText()==null) {
newContact.setCep("sem CEP");
}else {
newContact.setCep(cepTextField.getText());
}
if(emailTextField.getText()==null) {
newContact.setEmail("sem e-mail");
} else {
newContact.setEmail(emailTextField.getText());
}
if(otherInfoTextArea.getText()==null) {
newContact.setOtherInformation("sem mais informações");
}else {
newContact.setOtherInformation(otherInfoTextArea.getText());
}
newContact.setCreationDate(formatter.format(creationDate).toString());
mainApp.addContactToAgendaDataArrayList(newContact);
mainApp.refreshFullContentInMainLayout();
mainApp.saveFile();
Stage stage = (Stage) saveButton.getScene().getWindow();
stage.close();
}
}

Compare the first method output of the entries with id address 12 and the other ones that have new lines before them.
It is possible that some data are inserted on windows (therefore the CR LF whitespaces) and some on the unix system (which uses only LF). Anyway, it seems tha data itself contains new line marks, the PrinterWriter works as you would like.
A small test:
import java.util.ArrayList;
import java.io.*;
public class Main {
public static void main(String[] args) {
System.out.println("Hello");
ArrayList<Contact> list = new ArrayList<>();
list.add(new Contact());
list.add(new Contact());
list.add(new Contact());
list.add(new Contact());
list.add(new Contact());
try {
File file = new File("output.txt");
PrintWriter p = new PrintWriter(file);
int count = list.size();
for (int i = 0; i < count; i++) {
Contact temp = list.get(i);
p.println(temp.getFavColour() + ";" + temp.getSurname() + ";" + temp.getName() + ";");
}
p.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static class Contact {
public String getName() {
return "John";
}
public String getSurname() {
return "Black";
}
public String getFavColour() {
return "red";
}
}
}

how to remove 503 exceptions in java

I have a list of names in the form of a CSV and I am up for google searching those names using java. But the problem that i am facing is that when i initially run the code i am able to search the query but in the middle of the code the code starts to throw 503 exceptions and when i again run the code it starts throwing 503 exceptions from the very beginning.Here is the code that i am using.
public class ExtractInformation
{
static String firstname,middlename,lastname;
public static final int PAGE_NUMBERS = 10;
public static void readCSV()
{
boolean first = true;
try
{
String splitBy = ",";
BufferedReader br = new BufferedReader(new FileReader("E:\\KOLDump\\names.csv"));
String line = null;
String site = null;
while((line=br.readLine())!=null)
{
if(first)
{
first = false;
continue;
}
String[] b = line.split(splitBy);
firstname = b[0];
middlename = b[1];
lastname = b[2];
String name = null;
if(middlename == null || middlename.length() == 0)
{
name = firstname+" "+lastname+" OR "+lastname+" "+firstname.charAt(0);
}
else
{
name = firstname+" "+lastname+" OR "+lastname+" "+firstname.charAt(0)+" OR "+firstname+" "+middlename.charAt(0)+". "+lastname;
}
BufferedReader brs = new BufferedReader(new FileReader("E:\\KOLDump\\site.csv"));
while((site = brs.readLine()) != null)
{
if(first)
{
first = false;
continue;
}
String [] s = site.split(splitBy);
String siteName = s[0];
siteName = (siteName.replace("www.", ""));
siteName = (siteName.replace("http://", ""));
getDataFromGoogle(name.trim(), siteName.trim());
}
brs.close();
}
//br.close();
}
catch(Exception e)
{
System.out.println("unable to read file...some problem in the csv");
}
}
public static void main(String[] args)
{
readCSV();
}
private static void getDataFromGoogle(String query,String siteName)
{
Set<String> result = new HashSet<String>();
String request = "http://www.google.co.in/search?q="+query+" "+siteName;
try
{
Document doc = Jsoup.connect(request).userAgent("Chrome").timeout(10000).get();
Element query_results = doc.getElementById("ires");
Elements gees = query_results.getElementsByClass("g");
for(Element gee : gees)
{
Element h3 = gee.getElementsByTag("h3").get(0);
String annotation = h3.getElementsByTag("a").get(0).attr("href");
if(annotation.split("q=",2)[1].contains(siteName))
{
System.out.println(annotation.split("q=",2)[1]);
}
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
any suggestions on how to remove this exceptions from the code would really be helpful.

If you wait a little do the 503's go away? If so, then you're probably being rate-limited by Google. https://support.google.com/gsa/answer/2686272?hl=en
You may need to put some kind of delay between requests.

How can i return an array in java that is accessible by other objects?

I want to return an array that is accessible by other objects after having read a text file. My instruction parsing class is:
import java.io.*;
public class Instruction {
public String[] instructionList;
public String[] readFile() throws IOException {
FileInputStream in = new FileInputStream("directions.txt");
BufferedReader br = new BufferedReader(new InputStreamReader(in));
int n = 5;
instructionList = new String[n];
for (int j = 0; j < instructionList.length; j++) {
instructionList[j] = br.readLine();
}
in.close();
return instructionList;
}
}
The above takes in a text file with 5 lines of text in it. In my main() I want to run that function and have the string array be accessible to other objects.
import java.util.Arrays;
public class RoverCommand {
public static void main(String[] args) throws Exception {
Instruction directions = new Instruction();
directions.readFile();
String[] directionsArray;
directionsArray = directions.returnsInstructionList();
System.out.println(Arrays.toString(directionsArray));
}
}
What's the best way to do that? I would need the elements of the array to be integers if they are numbers and strings if they are letters. P.S. I'm brand new to Java. is there a better way to do what I'm doing?

You don't have to use generics. I try to catch exceptions in the accessors and return null if anything blows up. So you can test if the value returned is null before proceeding.
// Client.java
import java.io.IOException;
public class Client {
public static void main(String args[]) {
try {
InstructionList il = new InstructionList();
il.readFile("C:\\testing\\ints.txt", 5);
int[] integers = il.getInstructionsAsIntegers();
if (integers != null) {
for (int i : integers) {
System.out.println(i);
}
}
} catch (IOException e) {
// handle
}
}
}
// InstructionList.java
import java.io.*;
public class InstructionList {
private String[] instructions;
public void readFile(String path, int lineLimit) throws IOException {
FileInputStream in = new FileInputStream(path);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
instructions = new String[lineLimit];
for (int i = 0; i < lineLimit; i++) {
instructions[i] = br.readLine();
}
in.close();
}
public String[] getInstructionsAsStrings() {
return instructions; // will return null if uninitialized
}
public int[] getInstructionsAsIntegers() {
if (this.instructions == null) {
return null;
}
int[] instructions = new int[this.instructions.length];
try {
for (int i = 0; i < instructions.length; i++) {
instructions[i] = new Integer(this.instructions[i]);
}
} catch (NumberFormatException e) {
return null; // data integrity fail, return null
}
return instructions;
}
}

check instructionList is null or not. if it is null, call readFile method.
public String[] returnsInstructionList() {
if (instructionList== null){
try { readFile(); } catch(Exception e){}
}
return instructionList;
}
because of readFile can throw exception, it would be good to use one extra variable. like:
private boolean fileReaded = false;
public String[] returnsInstructionList() {
if (!fileReaded){
fileReaded = true;
try { readFile(); } catch(Exception e){}
}
return instructionList;
}
and if readFile can be run concurrently, easiest way to make function synchronized, like
private boolean fileReaded = false;
public synchronized void readFile() throws IOException {
.
.
.
}
public synchronized String[] returnsInstructionList() {
if (!fileReaded){
fileReaded = true;
try { readFile(); } catch(Exception e){}
}
return instructionList;
}

There is no guarantee that readFile is called before returnsInstructionList is invoked. Leaving you returnsInstructionList returning null.
I would :
public String[] getContentsFromFile(String fileName) throws IOException {
FileInputStream in = new FileInputStream(fileName);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
int n = 5;
instructionList = new String[n];
for (int j = 0; j < instructionList.length; j++) {
instructionList[j] = br.readLine();
}
in.close();
return instructionList;
}
Part two to the question you can use generics. To achieve what you want but you have to incorporate a way to say what it is.
Eg
public class Foo {
public ReturnForFoo returnAStringOrIntger(boolean val) {
if(val){
return new ReturnForFoo("String", ValueType.STRING) ;
}
return new ReturnForFoo(10, ValueType.INTEGER); //int
}
}
public class ReturnForFoo {
Object value;
ValueType type;
public ReturnForFoo(Object value, ValueType type) {
this.value=value;
this.type=type
}
// Asume you have getters for both value and value type
public static ENUM ValueType {
STRING,
INTEGER,
UNKNOWN
}
}
This code is in your main.
Foo foo = new Foo();
String value;
int val;
ReturnForFoo returnForFoo = foo.returnAStringOrIntger(true);
// NOTE you can use switch instead of if's and else if's. It will be better
if(returnForFoo.getValueType().equals(ValueType.INTEGER)){
val = (int) returnForFoo.getValue();
} else if(returnForFoo.getValueType().equals(ValueType.STRING)){
value = (String) returnForFoo.getValue();
} else {
// UNKOWN Case
}

Iterate over folders in JAR file directly

I have the following code to iterate over folders and files in the class path and determine the classes and get a field with a ID and print them out to a logger. This is working fine if I run this code in my IDE, but if I package my project into a JAR file and this JAR file into a EXE file with launch4j, I can't iterate over my classes again.
I get the following path if I try to iterate over my classes in the JAR/EXE file:
file:/C:/ENTWICKLUNG/java/workspaces/MyProject/MyProjectTest/MyProjectSNAPSHOT.exe!/com/abc/def
How can I achieve this to iterate over all my classes in my JAR/EXE file?
public class ClassInfoAction extends AbstractAction
{
/**
* Revision/ID of this class from SVN/CVS.
*/
public static String ID = "#(#) $Id ClassInfoAction.java 43506 2013-06-27 10:23:39Z $";
private ClassLoader classLoader = ClassLoader.getSystemClassLoader();
private ArrayList<String> classIds = new ArrayList<String>();
private ArrayList<String> classes = new ArrayList<String>();
private int countClasses = 0;
#Override
public void actionPerformed(ActionEvent e)
{
countClasses = 0;
classIds = new ArrayList<String>();
classes = new ArrayList<String>();
getAllIds();
Iterator<String> it = classIds.iterator();
while (it.hasNext())
{
countClasses++;
//here I print out the ID
}
}
private void getAllIds()
{
String tempName;
String tempAbsolutePath;
try
{
ArrayList<File> fileList = new ArrayList<File>();
Enumeration<URL> roots = ClassLoader.getSystemResources("com"); //it is a path like com/abc/def I won't do this path public
while (roots.hasMoreElements())
{
URL temp = roots.nextElement();
fileList.add(new File(temp.getPath()));
GlobalVariables.LOGGING_logger.info(temp.getPath());
}
for (int i = 0; i < fileList.size(); i++)
{
for (File file : fileList.get(i).listFiles())
{
LinkedList<File> newFileList = null;
if (file.isDirectory())
{
newFileList = (LinkedList<File>) FileUtils.listFiles(file, TrueFileFilter.INSTANCE, TrueFileFilter.INSTANCE);
if (newFileList != null)
{
for (int j = 0; j < newFileList.size(); j++)
{
tempName = newFileList.get(j).getName();
tempAbsolutePath = newFileList.get(j).getAbsolutePath();
checkIDAndAdd(tempName, tempAbsolutePath);
}
}
}
else
{
tempName = file.getName();
tempAbsolutePath = file.getAbsolutePath();
checkIDAndAdd(tempName, tempAbsolutePath);
}
}
}
getIdsClasses();
}
catch (IOException e)
{
}
}
private void checkIDAndAdd(String name, String absolutePath)
{
if (name.endsWith(".class") && !name.matches(".*\\d.*") && !name.contains("$"))
{
String temp = absolutePath.replace("\\", ".");
temp = temp.substring(temp.lastIndexOf(/* Class prefix */)); //here I put in the class prefix
classes.add(FilenameUtils.removeExtension(temp));
}
}
private void getIdsClasses()
{
for (int i = 0; i < classes.size(); i++)
{
String className = classes.get(i);
Class<?> clazz = null;
try
{
clazz = Class.forName(className);
Field idField = clazz.getDeclaredField("ID");
idField.setAccessible(true);
classIds.add((String) idField.get(null));
}
catch (ClassNotFoundException e1)
{
}
catch (NoSuchFieldException e)
{
}
catch (SecurityException e)
{
}
catch (IllegalArgumentException e)
{
}
catch (IllegalAccessException e)
{
}
}
}
}

You cannot create File objects from arbitrary URLs and use the usual filesystem traversal methods. Now, I'm not sure if launch4j does make any difference, but as for iterating over the contents of plain JAR file, you can use the official API:
JarURLConnection connection = (JarURLConnection) url.openConnection();
JarFile file = connection.getJarFile();
Enumeration<JarEntry> entries = file.entries();
while (entries.hasMoreElements()) {
JarEntry e = entries.nextElement();
if (e.getName().startsWith("com")) {
// ...
}
}
Above snippet lists all the entries in the JAR file referenced by url, i.e. files and directories.

Sorting lines in a file by 2 fields with JAVA

I work at a printing company that has many programs in COBOL and I have been tasked to
convert the COBOL programs into JAVA programs. I've run into a snag in the one conversion. I need to take a file that each line is a record and on each line the data is blocked.
Example of a line is
60000003448595072410013 FFFFFFFFFFV 80 0001438001000014530020120808060134
I need to sort data by a 5 digit number at the 19-23 characters and then by the very first character on a line.
BufferedReader input;
BufferedWriter output;
String[] sort, sorted, style, accountNumber, customerNumber;
String holder;
int lineCount;
int lineCounter() {
int result = 0;
boolean eof = false;
try {
FileReader inputFile = new FileReader("C:\\Users\\cbook\\Desktop\\Chemical\\"
+ "LB26529.fil");
input = new BufferedReader(inputFile);
while (!eof) {
holder = input.readLine();
if (holder == null) {
eof = true;
} else {
result++;
}
}
} catch (IOException e) {
System.out.println("Error - " + e.toString());
}
return result;
}
chemSort(){
lineCount = this.lineCounter();
sort = new String[lineCount];
sorted = new String[lineCount];
style = new String[lineCount];
accountNumber = new String[lineCount];
customerNumber = new String[lineCount];
try {
FileReader inputFile = new FileReader("C:\\Users\\cbook\\Desktop\\Chemical\\"
+ "LB26529.fil");
input = new BufferedReader(inputFile);
for (int i = 0; i < (lineCount + 1); i++) {
holder = input.readLine();
if (holder != null) {
sort[i] = holder;
style[i] = sort[i].substring(0, 1);
customerNumber[i] = sort[i].substring(252, 257);
}
}
} catch (IOException e) {
System.out.println("Error - " + e.toString());
}
}
This what I have so far and I'm not really sure where to go from here or even if this is the correct way
to go about sorting the file. After the file is sorted it will be stored into another file and processed
again with another program for it to be ready for printing.

List<String> linesAsList = new ArrayList<String>();
String line=null;
while(null!=(line=reader.readLine())) linesAsList.add(line);
Collections.sort(linesAsList, new Comparator<String>() {
public int compare(String o1,String o2){
return (o1.substring(18,23)+o1.substring(0,1)).compareTo(o2.substring(18,23)+o2.substring(0,1));
}});
for (String line:linesAsList) System.out.println(line); // or whatever output stream you want
This phone's autocorrect is messing up my answer

Read the file into an ArrayList (instead of an array). Use the following methods:
// to declare the arraylist
ArrayList<String> lines = new ArrayList<String>();
// to add a new line to it (within your reading-lines loop)
lines.add(input.readLine());
Then, sort it using a custom Comparator:
Collections.sort(lines, new Comparator<String>() {
public int compare(String a, String b) {
String a5 = theFiveNumbersOf(a);
String b5 = theFiveNumbersOf(b);
int firstComparison = a5.compareTo(b5);
if (firstComparison != 0) { return firstComparison; }
String a1 = theDigitOf(a);
String b1 = theDigitOf(b);
return a1.compareTo(b1);
}
});
(It is unclear what 5 digits or what digit you want to compare; I've left them as functions for you to fill in).
Finally, write it to the output file:
BufferedWriter ow = new BufferedWriter(new FileOutputStream("filename.extension"));
for (String line : lines) {
ow.println(line);
}
ow.close();
(adding imports and try/catch as needed)

This code will sort a file based on mainframe sort parameters.
You pass 3 parameters to the main method of the Sort class.
The input file path.
The output file path.
The sort parameters in mainframe sort format. In your case, this string would be 19,5,CH,A,1,1,CH,A
This first class, the SortParameter class, holds instances of the sort parameters. There's one instance for every group of 4 parameters in the sort parameters string. This class is a basic getter / setter class, except for the getDifference method. The getDifference method brings some of the sort comparator code into the SortParameter class to simplify the comparator code in the Sort class.
public class SortParameter {
protected int fieldStartByte;
protected int fieldLength;
protected String fieldType;
protected String sortDirection;
public SortParameter(int fieldStartByte, int fieldLength, String fieldType,
String sortDirection) {
this.fieldStartByte = fieldStartByte;
this.fieldLength = fieldLength;
this.fieldType = fieldType;
this.sortDirection = sortDirection;
}
public int getFieldStartPosition() {
return fieldStartByte - 1;
}
public int getFieldEndPosition() {
return getFieldStartPosition() + fieldLength;
}
public String getFieldType() {
return fieldType;
}
public String getSortDirection() {
return sortDirection;
}
public int getDifference(String a, String b) {
int difference = 0;
if (getFieldType().equals("CH")) {
String as = a.substring(getFieldStartPosition(),
getFieldEndPosition());
String bs = b.substring(getFieldStartPosition(),
getFieldEndPosition());
difference = as.compareTo(bs);
if (getSortDirection().equals("D")) {
difference = -difference;
}
}
return difference;
}
}
The Sort class contains the code to read the input file, sort the input file, and write the output file. This class could probably use some more error checking.
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
public class Sort implements Runnable {
protected List<String> lines;
protected String inputFilePath;
protected String outputFilePath;
protected String sortParameters;
public Sort(String inputFilePath, String outputFilePath,
String sortParameters) {
this.inputFilePath = inputFilePath;
this.outputFilePath = outputFilePath;
this.sortParameters = sortParameters;
}
#Override
public void run() {
List<SortParameter> parameters = parseParameters(sortParameters);
lines = read(inputFilePath);
lines = sort(lines, parameters);
write(outputFilePath, lines);
}
protected List<SortParameter> parseParameters(String sortParameters) {
List<SortParameter> parameters = new ArrayList<SortParameter>();
String[] field = sortParameters.split(",");
for (int i = 0; i < field.length; i += 4) {
SortParameter parameter = new SortParameter(
Integer.parseInt(field[i]), Integer.parseInt(field[i + 1]),
field[i + 2], field[i + 3]);
parameters.add(parameter);
}
return parameters;
}
protected List<String> sort(List<String> lines,
final List<SortParameter> parameters) {
Collections.sort(lines, new Comparator<String>() {
#Override
public int compare(String a, String b) {
for (SortParameter parameter : parameters) {
int difference = parameter.getDifference(a, b);
if (difference != 0) {
return difference;
}
}
return 0;
}
});
return lines;
}
protected List<String> read(String filePath) {
List<String> lines = new ArrayList<String>();
BufferedReader reader = null;
try {
String line;
reader = new BufferedReader(new FileReader(filePath));
while ((line = reader.readLine()) != null) {
lines.add(line);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return lines;
}
protected void write(String filePath, List<String> lines) {
BufferedWriter writer = null;
try {
writer = new BufferedWriter(new FileWriter(filePath));
for (String line : lines) {
writer.write(line);
writer.newLine();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (writer != null) {
writer.flush();
writer.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
if (args.length < 3) {
System.err.println("The sort process requires 3 parameters.");
System.err.println(" 1. The input file path.");
System.err.println(" 2. The output file path.");
System.err.print (" 3. The sort parameters in mainframe ");
System.err.println("sort format. Example: 15,5,CH,A");
} else {
new Sort(args[0], args[1], args[2]).run();
}
}
}