I use LanguageTool for some spellchecking and spell correction functionality in my application.
The LanguageTool documentation describes how to exclude words from spell checking (with call the addIgnoreTokens(...) method of the spell checking rule you're using).
How do you add some words (e.g., from a specific dictionary) to spell checking? That is, can LanguageTool fix words with misspellings and suggest words from my specific dictionary?
Unfortunately, the API doesn't support this I think. Without the API, you can add words to spelling.txt to get them accepted and used as suggestions. With the API, you might need to extend MorfologikSpellerRule and change this place of the code. (Disclosure: I'm the maintainer of LanguageTool)
I have similar requirement, which is load some custom words into dictionary as "suggest words", not just "ignored words". And finally I extend MorfologikSpellerRule to do this:
Create class MorfologikSpellerRuleEx extends from MorfologikSpellerRule, override the method "match()", and write my own "initSpeller()" for creating spellers.
And then for the language tool, create this custom speller rule to replace existing one.
Code:
Language lang = new AmericanEnglish();
JLanguageTool langTool = new JLanguageTool(lang);
langTool.disableRule("MORFOLOGIK_RULE_EN_US");
try {
MorfologikSpellerRuleEx spellingRule = new MorfologikSpellerRuleEx(JLanguageTool.getMessageBundle(), lang);
spellingRule.setSpellingFilePath(spellingFilePath);
//spellingFilePath is the file has my own words + words from /hunspell/spelling_en-US.txt
langTool.addRule(spellingRule);
} catch (IOException e) {
e.printStackTrace();
}
The code of my custom MorfologikSpellerRuleEx:
public class MorfologikSpellerRuleEx extends MorfologikSpellerRule {
private String spellingFilePath = null;
private boolean ignoreTaggedWords = false;
public MorfologikSpellerRuleEx(ResourceBundle messages, Language language) throws IOException {
super(messages, language);
}
#Override
public String getFileName() {
return "/en/hunspell/en_US.dict";
}
#Override
public String getId() {
return "MORFOLOGIK_SPELLING_RULE_EX";
}
#Override
public void setIgnoreTaggedWords() {
ignoreTaggedWords = true;
}
public String getSpellingFilePath() {
return spellingFilePath;
}
public void setSpellingFilePath(String spellingFilePath) {
this.spellingFilePath = spellingFilePath;
}
private void initSpellerEx(String binaryDict) throws IOException {
String plainTextDict = null;
if (JLanguageTool.getDataBroker().resourceExists(getSpellingFileName())) {
plainTextDict = getSpellingFileName();
}
if (plainTextDict != null) {
BufferedReader br = null;
if (this.spellingFilePath != null) {
try {
br = new BufferedReader(new FileReader(this.spellingFilePath));
}
catch (Exception e) {
br = null;
}
}
if (br != null) {
speller1 = new MorfologikMultiSpeller(binaryDict, br, plainTextDict, 1);
speller2 = new MorfologikMultiSpeller(binaryDict, br, plainTextDict, 2);
speller3 = new MorfologikMultiSpeller(binaryDict, br, plainTextDict, 3);
br.close();
}
else {
speller1 = new MorfologikMultiSpeller(binaryDict, plainTextDict, 1);
speller2 = new MorfologikMultiSpeller(binaryDict, plainTextDict, 2);
speller3 = new MorfologikMultiSpeller(binaryDict, plainTextDict, 3);
}
setConvertsCase(speller1.convertsCase());
} else {
throw new RuntimeException("Could not find ignore spell file in path: " + getSpellingFileName());
}
}
private boolean canBeIgnored(AnalyzedTokenReadings[] tokens, int idx, AnalyzedTokenReadings token)
throws IOException {
return token.isSentenceStart() || token.isImmunized() || token.isIgnoredBySpeller() || isUrl(token.getToken())
|| isEMail(token.getToken()) || (ignoreTaggedWords && token.isTagged()) || ignoreToken(tokens, idx);
}
#Override
public RuleMatch[] match(AnalyzedSentence sentence) throws IOException {
List<RuleMatch> ruleMatches = new ArrayList<>();
AnalyzedTokenReadings[] tokens = getSentenceWithImmunization(sentence).getTokensWithoutWhitespace();
// lazy init
if (speller1 == null) {
String binaryDict = null;
if (JLanguageTool.getDataBroker().resourceExists(getFileName())) {
binaryDict = getFileName();
}
if (binaryDict != null) {
initSpellerEx(binaryDict); //here's the change
} else {
// should not happen, as we only configure this rule (or rather its subclasses)
// when we have the resources:
return toRuleMatchArray(ruleMatches);
}
}
int idx = -1;
for (AnalyzedTokenReadings token : tokens) {
idx++;
if (canBeIgnored(tokens, idx, token)) {
continue;
}
// if we use token.getToken() we'll get ignored characters inside and speller
// will choke
String word = token.getAnalyzedToken(0).getToken();
if (tokenizingPattern() == null) {
ruleMatches.addAll(getRuleMatches(word, token.getStartPos(), sentence));
} else {
int index = 0;
Matcher m = tokenizingPattern().matcher(word);
while (m.find()) {
String match = word.subSequence(index, m.start()).toString();
ruleMatches.addAll(getRuleMatches(match, token.getStartPos() + index, sentence));
index = m.end();
}
if (index == 0) { // tokenizing char not found
ruleMatches.addAll(getRuleMatches(word, token.getStartPos(), sentence));
} else {
ruleMatches.addAll(getRuleMatches(word.subSequence(index, word.length()).toString(),
token.getStartPos() + index, sentence));
}
}
}
return toRuleMatchArray(ruleMatches);
}
}
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I need to parse xml data in android. I have seen this project: here from github which teaches how to parse xml data in listbox. However, I want to get xml data to different strings. Although, I have used pretty much the same code as in the github project but I only get error and the app stops responding.
Code:
public class Main extends Fragment {
android.view.View myview;
EditText number;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myview = inflater.inflate(R.layout.fragment_screen, container, false);
number = (EditText) myview.findViewById(R.id.number);
XmlParser par = new XmlParser();
number.setText(par.getStackSitesFromFile(getActivity().getBaseContext())
.get(0).getLink()); **Error here**
return myview;
}
}
XmlParser.java
public class XmlParser {
static final String KEY_SITE = "rate";
static final String KEY_NAME = "Name";
static final String KEY_LINK = "Rate";
static final String KEY_ABOUT = "Date";
static final String KEY_IMAGE_URL = "Time";
public static List<HandleXML> getStackSitesFromFile(Context ctx) {
// List of StackSites that we will return
List<HandleXML> stackSites;
stackSites = new ArrayList<HandleXML>();
// temp holder for current StackSite while parsing
HandleXML curStackSite = null;
// temp holder for current text value while parsing
String curText = "";
try {
// Get our factory and PullParser
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
// Open up InputStream and Reader of our file.
FileInputStream fis = ctx.openFileInput("/sdcard/rates.xml");
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
// point the parser to our file.
xpp.setInput(reader);
// get initial eventType
int eventType = xpp.getEventType();
// Loop through pull events until we reach END_DOCUMENT
while (eventType != XmlPullParser.END_DOCUMENT) {
// Get the current tag
String tagname = xpp.getName();
// React to different event types appropriately
switch (eventType) {
case XmlPullParser.START_TAG:
if (tagname.equals("test")) {
curStackSite = new HandleXML();
}
break;
case XmlPullParser.TEXT:
//grab the current text so we can use it in END_TAG event
curText = xpp.getText();
break;
case XmlPullParser.END_TAG:
if (tagname.equalsIgnoreCase("test")) {
stackSites.add(curStackSite);
} else if (tagname.equalsIgnoreCase(KEY_NAME)) {
curStackSite.setName(curText);
} else if (tagname.equals("Rate")) {
curStackSite.setLink(curText);
} else if (tagname.equalsIgnoreCase(KEY_ABOUT)) {
curStackSite.setAbout(curText);
} else if (tagname.equalsIgnoreCase(KEY_IMAGE_URL)) {
curStackSite.setImgUrl(curText);
}
break;
default:
break;
}
eventType = xpp.next();
}
} catch (Exception e) {
e.printStackTrace();
}
// return the populated list.
return stackSites;
}
}
And finally, HandleXml.java
public class HandleXML {
private String name;
private String rate;
private String date;
private String time;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getLink() {
return rate;
}
public void setLink(String rate) {
this.rate = rate;
}
public String getAbout() {
return date;
}
public void setAbout(String date) {
this.date = date;
}
public String getImgUrl() {
return time;
}
public void setImgUrl(String time) {
this.time = time;
}
#Override
public String toString() {
return name + rate;
}
}
Xml File:
<?xml version="1.0" encoding="UTF-8"?>
<query xmlns:yahoo="http://www.yahooapis.com/v1/base.rng" yahoo:count="1" yahoo:created="2016-09-07T05:50:08Z" yahoo:lang="en-US">
<results>
<test>
<Name>EUR/USD</Name>
<Rate>1.1251</Rate>
<Date>9/7/2016</Date>
<Time>0:56am</Time>
</test>
<test>
<Name>EUR/USD</Name>
<Rate>1.1253</Rate>
<Date>9/7/2016</Date>
<Time>0:56am</Time>
</test>
</results>
</query>
The error is in the first fragment of code in: number.setText(par.getStackSitesFromFile(getActivity().getBaseContext()).get(0).getLink());
The arraylist returns empty because FileInputStream fis is set to open a file which contains path separator (/) , and it causes
java.lang.IllegalArgumentException: File /sdcard/rates.xml contains a path separator
. You have to use
FileInputStream fis = new FileInputStream (new File("/sdcard/rates.xml")); instead. Do not forget to close fis by fis.close();
Final code for XmlParser will be:
public class XmlParser {
static final String KEY_SITE = "rate";
static final String KEY_NAME = "Name";
static final String KEY_LINK = "Rate";
static final String KEY_ABOUT = "Date";
static final String KEY_IMAGE_URL = "Time";
FileInputStream fis;
public static List<HandleXML> getStackSitesFromFile() {
// List of StackSites that we will return
List<HandleXML> stackSites;
stackSites = new ArrayList<HandleXML>();
// temp holder for current StackSite while parsing
HandleXML curStackSite = null;
// temp holder for current text value while parsing
String curText = "";
try {
// Get our factory and PullParser
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
// Open up InputStream and Reader of our file.
fis = new FileInputStream(new File("/sdcard/rates.xml"));
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
// point the parser to our file.
xpp.setInput(reader);
// get initial eventType
int eventType = xpp.getEventType();
// Loop through pull events until we reach END_DOCUMENT
while (eventType != XmlPullParser.END_DOCUMENT) {
// Get the current tag
String tagname = xpp.getName();
// React to different event types appropriately
switch (eventType) {
case XmlPullParser.START_TAG:
if (tagname.equals("test")) {
curStackSite = new HandleXML();
}
break;
case XmlPullParser.TEXT:
//grab the current text so we can use it in END_TAG event
curText = xpp.getText();
break;
case XmlPullParser.END_TAG:
if (tagname.equalsIgnoreCase("test")) {
stackSites.add(curStackSite);
} else if (tagname.equalsIgnoreCase(KEY_NAME)) {
curStackSite.setName(curText);
} else if (tagname.equals("Rate")) {
curStackSite.setLink(curText);
} else if (tagname.equalsIgnoreCase(KEY_ABOUT)) {
curStackSite.setAbout(curText);
} else if (tagname.equalsIgnoreCase(KEY_IMAGE_URL)) {
curStackSite.setImgUrl(curText);
}
break;
default:
break;
}
eventType = xpp.next();
}
} catch (Exception e) {
e.printStackTrace();
}
try {
fis.close();
}catch(Exception e){
Log.i("Problem closing", "Closing fis");
}
// return the populated list.
return stackSites;
}
}
And then set number.setText() like that: number.setText(par.getStackSitesFromFile().get(0).getLink());
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.
I have this simple formatter class in my webservice
public class SimpleFormatter extends BaseFormatter
{
public String getXml(String str)
{
sb = new StringBuilder();
sb.append(XML);
sb.append(str);
return sb.toString();
}
public String getXml(byte[] ba)
{
sb = new StringBuilder();
sb.append(XML);
sb.append(new String(ba));
return sb.toString();
}
public static void main(String[] args)
{
SimpleFormatter sf = new SimpleFormatter();
String result = sf.getXml("<result></result>");
System.out.println(result);
}
BaseFormatter Class
public abstract class BaseFormatter
{
protected static final String XML = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>";
protected static final String ERROR = "error";
protected static final String RESULT = "result";
public static final String EMPTY = XML + "<results/>";
protected StringBuilder sb = null;
protected void openTag(String tag)
{
sb.append("<");
sb.append(tag);
sb.append(">");
}
protected void openTagWithAttr(String tag, String attr, String val)
{
sb.append("<");
sb.append(tag);
if (val.length()>0)
{
sb.append(" ");
sb.append(attr);
sb.append("=\"");
sb.append(val);
sb.append("\"");
}
sb.append(">");
}
protected void closeTag(String tag)
{
sb.append("</");
sb.append(tag);
sb.append(">");
}
/**
Returns an error document
**/
public String getError(String msg)
{
sb = new StringBuilder();
sb.append(XML);
openTag(ERROR);
sb.append(msg);
closeTag(ERROR);
return sb.toString();
}
private void addEmpty(String tag)
{
sb.append("<");
sb.append(tag);
sb.append("/>");
}
/**
Adds elements to the document; NOTE: adds an empty element even if the value list is empty
**/
protected void addElement(List<String> vals, List<String> keys)
{
int len = vals.size();
openTag(RESULT);
if (len == 0 && keys.size() > 0) addEmpty(keys.get(0));
for (int i=0; i < len; i++)
{
String key = keys.get(i);
openTag(key);
sb.append(vals.get(i));
closeTag(key);
}
closeTag(RESULT);
}
}
And im using it to format result when using the web service
private SimpleFormatter formatter = null;
public String getJobData(Map<String, String> paramMap)
{
String str1 = (String)paramMap.get("jobId");
if (str1 == null) {
return this.formatter.getError("No job ID provided for query");
}
Query_filter localQuery_filter = new Query_filter("Job", str1);
Query_filter[] arrayOfQuery_filter = { localQuery_filter };
Node localNode = mgr.getQueryResult("HolderJob", JOB_NAMES, JOB_TAGS, arrayOfQuery_filter);
if (localNode == null) {
return this.formatter.getError("Could not retrieve job data; check job ID");
}
String str2 = null;
try
{
str2 = Documents.writeToString(localNode);
}
catch (Exception localException) {}
return this.formatter.getXml(str2);
}
I am getting a null pointer exception when using the formatter class.
but if i do it like this:
return str2;
the result im getting is just a plain string:
false150305510190 ROW VERI219254591150110
This is the result i am expecting if i use the formatter class.
<Table><Claimable>false</Claimable><MinorRev>150305</MinorRev><Operation>510190 ROW VERI</Operation><Experiment>219254</Experiment><HTNum>591</HTNum><WaferEC>150110</WaferEC></Table>
Im using Netbeans 8.0.2
Apache 7.0.63
Can anyone guide me about this?
Thank you.
I'm doing a simple MessageRenderer.
It's specification:
Render message based on an Context (it's a map that's contains all key/value pair parameters)
Supports simple render such as: Your username is << username >>. Assume username in the context is barcelona and the result will be Your username is Barcelona.
Supported function-like object. Example: Current time is << now() >>, now(): is an object that will returns a string of current date time. And result will be: Current time is 2011-05-30
Each parameter of function can also be templated: Current time is << now( << date_format >> ) >> . This template returns a string of current date time with format is the value of key 'date_format' retrieved from the Context. Assume date_format in Context is dd/MM/yyyy and the result will be: Current time is 30/05/2011
Each parameter of function can also be templated with a different method call: Time is << now_locale ( << getLocale() >> ). Assume that getLocale() is an function object that will be return a locale is en_US and the result will be: Time is 2011/05/30 11:20:34 PM
Template can be nested. Example: Your user name is << << username >> >>. It means, Key username has value param1, Key param1 has value is barcelona so the final result will be: Your user name is Barcelona.
My classes and interfaces:
RenderContext.java
public interface RenderContext {
public String getParameter(String key);
}
MessageRenderer.java
public interface MessageRenderer {
public String render(String s, RenderContext... context);
}
MethodExpressionEvaluator.java
// Using this class to implements the method evaluation, such as now(), now_locale()
public interface MethodExpressionEvaluator {
public String evaluate(String[] methodParams, RenderContext... context);
}
AbstractMessageRenderer.java
public abstract class AbstractMessageRenderer implements MessageRenderer {
public static final String DEFAULT_NULL = "###";
public static final String PLACEHOLDER_START_TOKEN = "<<";
public static final String PLACEHOLDER_END_TOKEN = ">>";
protected int lenPlaceholderStartToken = 0;
protected int lenPlaceholderEndToken = 0;
protected String nullToken;
protected String placeholderStartToken;
protected String placeholderEndToken;
protected boolean escape = true;
public AbstractMessageRenderer() {
placeholderStartToken = PLACEHOLDER_START_TOKEN;
placeholderEndToken = PLACEHOLDER_END_TOKEN;
lenPlaceholderStartToken = placeholderStartToken.length();
lenPlaceholderEndToken = placeholderEndToken.length();
nullToken = DEFAULT_NULL;
}
public String getNullToken() {
return nullToken;
}
public void setNullToken(String defaultNull) {
this.nullToken = defaultNull;
}
public String getPlaceholderStartToken() {
return placeholderStartToken;
}
public void setPlaceholderStartToken(String placeholderStartToken) {
this.placeholderStartToken = placeholderStartToken;
lenPlaceholderStartToken = placeholderStartToken.length();
}
public String getPlaceholderEndToken() {
return placeholderEndToken;
}
public void setPlaceholderEndToken(String placeholderEndToken) {
this.placeholderEndToken = placeholderEndToken;
lenPlaceholderEndToken = placeholderEndToken.length();
}
public boolean isEscape() {
return escape;
}
public boolean getEscape() {
return escape;
}
public void setEscape(boolean escape) {
this.escape = escape;
}
public String getParam(String key, RenderContext... context) {
if(context != null)
{
for(RenderContext param:context)
{
if(param != null)
{
String value = param.getParameter(key);
if(!StringUtil.isEmpty(value))
{
return value;
}
}
}
}
return nullToken;
}
public String render(String s, RenderContext... context) {
// handle trivial cases of empty template or no placeholders
if (s == null)
{
Log4j.app.debug("Message is null in template. Cannot render null message.");
return nullToken;
}
if (context == null)
{
Log4j.app.debug("RenderContext is null. Cannot render message with null RenderContext.");
return nullToken;
}
if (s.indexOf(placeholderStartToken) < 0)
{
return s;
}
String msg = nullToken;
try
{
// private int renderTemplate(Renderable r, String src, StringBuffer dst, String nil, int i, String[] marks, StringBuffer end,boolean escapes)
msg = doRender(s, context);
}
catch (Exception e)
{
Log4j.app.error("Exception in rendering template: " + e.getMessage(), e);
return nullToken;
}
return msg;
}
protected abstract String doRender(String s, RenderContext... context);
}
MethodExpressionRenderer.java
public class MethodExpressionRenderer extends AbstractMessageRenderer {
private boolean inSingleQuote = false;
private boolean inDoubleQuote=false;
private int placeholders;
private Stack<String> methodStack;
private String[] endTokens;
private String marker;
private List<String> methodParams;
private String prefix = "&";
public MethodExpressionRenderer() {
super();
methodStack = new Stack<String>();
marker = ",";
endTokens = new String[] { placeholderEndToken, marker, "(", ")" };
methodParams = new ArrayList<String>();
}
public String getPrefix() {
return prefix;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public String getMarker() {
return marker;
}
public void setMarker(String marker) {
this.marker = marker;
endTokens = new String[] { placeholderEndToken, marker };
}
#Override
public void setPlaceholderEndToken(String placeholderEndToken) {
super.setPlaceholderEndToken(placeholderEndToken);
endTokens = new String[] { placeholderEndToken, marker };
}
protected String doRender(String s, RenderContext... context) {
StringBuffer sb = new StringBuffer();
try
{
renderTemplate(s, sb, nullToken, 0, endTokens, null, context);
}
catch (Exception e)
{
Log4j.app.error("Exception in rendering method expression message emplate: " + e.getMessage(), e);
return nullToken;
}
return sb.toString();
}
private int renderTemplate(String src, StringBuffer dst, String nil, int i, String[] marks, StringBuffer end, RenderContext... context) {
int len = src.length();
while (i < len)
{
char c = src.charAt(i);
if (escape)
{
if (c=='\\')
{
i++;
char ch = src.charAt(i);
if(inSingleQuote)
{
if(ch=='\'')
{
inSingleQuote=false;
}
}
else if(inDoubleQuote)
{
if(ch=='"')
{
inDoubleQuote=false;
}
}
else
{
if(ch=='\'')
{
inSingleQuote=true;
}
else if(ch=='"')
{
inDoubleQuote=true;
}
}
dst.append(ch);
i++;
continue;
}
}
if(inSingleQuote)
{
if(c=='\'')
{
inSingleQuote=false;
}
}
else if(inDoubleQuote)
{
if(c=='"')
{
inDoubleQuote=false;
}
}
else
{
if(c=='\'')
{
inSingleQuote=true;
}
else if(c=='"')
{
inDoubleQuote=true;
}
}
// check for end marker
if (marks != null && !inSingleQuote && !inDoubleQuote)
{
for (int m = 0; m < marks.length; m++)
{
// If one of markers found
if (src.regionMatches(i, marks[m], 0, marks[m].length()))
{
// return marker if required
if (end != null)
{
end.append(marks[m]);
}
return i+marks[m].length();
}
}
}
// check for start of placeholder
if (src.regionMatches(i, placeholderStartToken, i, lenPlaceholderStartToken))
{
synchronized(this)
{
++placeholders;
}
i = renderPlaceholder(src, dst, nil, i, new ArrayList<String>(), context);
continue;
}
// just add plain character
if(c != '\'' && c!= '"')
{
dst.append(c);
}
i++;
}
return i;
}
private int renderPlaceholder(String src, StringBuffer dst, String nil, int i, List<String> params, RenderContext... context){
StringBuffer token = new StringBuffer(); // placeholder token
StringBuffer end = new StringBuffer(); // placeholder end marker
String value;
i = renderTemplate(src, token, nil, i+lenPlaceholderStartToken, endTokens, end);
String sToken = token.toString().trim();
String sEnd = end.toString().trim();
boolean isFunction = sEnd.equals("(");
// This is method name
if(isFunction && placeholders > methodStack.size())
{ // Method
synchronized(this)
{
methodStack.push(sToken); // put method into stack
}
}
else if(!isFunction && (methodStack.size()==0) && sEnd.equals(placeholderEndToken)) // Single template param such as <<param>>
{
value = getParam(sToken, context);
if(value != null)
{
if(value.trim().startsWith(placeholderStartToken))
{
value = render(src, context);
}
dst.append(value);
return i;
}
}
// TODO: Process method parameters to invoke
//.... ?????????
// Found end method token ')'
// Pop method out of stack to invoke
if ( (methodStack.size() >0) && (sEnd.length() == 0 || sEnd.equals(")")))
{
String method = null;
synchronized(this)
{
// Pop method out of stack to invoke
method = methodStack.pop();
--placeholders;
dst.append(invokeMethodEvaluator(method, methodParams.toArray(new String[0]), context));
methodParams.clear();
}
}
return i;
}
// Currently this method just implement to test so it just printout the method name
// and its parameter
// We can register MethodExpressionEvaluator to process
protected String invokeMethodEvaluator(String method, String[] params, RenderContext... context){
StringBuffer result = new StringBuffer();
result.append("[ ")
.append(method)
.append(" ( ");
if(params != null)
{
for(int i=0; i<params.length; i++)
{
result.append(params[i]);
if(i != params.length-1)
{
result.append(" , ");
}
}
}
result.append(" ) ")
.append(" ] ");
return result.toString();
}
}
We can easily register more method to the renderer to invoke. Each method will be an object and can be reused. But I'm in trouble how to resolve the nested method parameter. Can anyone give me an advice how we can process nested template of method parameter to invoke??? The line has TODO. Will my code in on the right way???
When you evaluate something like << count( << getTransId() >> ) >> you can either:
perform direct-evaluation as you parse, and push each function onto a stack, so that once you've evaluated getTransId() you pop the stack and use the return value (from the stack) as an argument for count(), or
you can build a parse tree to represent all the function calls that will be made, and then evaluate your parse tree after building it. (Building a tree probably doesn't buy you anything; since you're writing a template engine there is probably no high-level tree operation 'optimizations' that you could perform.)
An excellent little book I really enjoyed was Language Implementation Patterns by Parr. He walks through building simple to complex languages, and covers decisions like this in some depth. (Yes, he uses the ANTLR parser generator throughout, but your code looks like you're familiar enough with hand-generated parsers that different tools won't be a distraction for you.)
I found the bug and fixed it.
This is my new source:
// AbstractMethodExpressionRenderer.java
public class AbstractMethodExpressionRenderer extends AbstractMessageRenderer {
private boolean inSingleQuote = false;
private boolean inDoubleQuote=false;
private Stack<MethodExpressionDescriptor> functionStack;
private String[] endTokens;
private String marker;
private String prefix = "~";
public AbstractMethodExpressionRenderer() {
super();
functionStack = new Stack<MethodExpressionDescriptor>();
marker = ",";
endTokens = new String[] { placeholderEndToken, "(", ")", };
}
private class MethodExpressionDescriptor {
public List<String> params;
public String function;
public MethodExpressionDescriptor() {
params = new ArrayList<String>();
}
public MethodExpressionDescriptor(String name) {
this();
this.function = name;
}
}
public String getPrefix() {
return prefix;
}
public void setPrefix(String prefix) {
this.prefix = prefix;
}
public String getMarker() {
return marker;
}
public void setMarker(String marker) {
this.marker = marker;
endTokens = new String[] { placeholderEndToken, marker };
}
#Override
public void setPlaceholderEndToken(String placeholderEndToken) {
super.setPlaceholderEndToken(placeholderEndToken);
endTokens = new String[] { placeholderEndToken, marker };
}
protected String doRender(String s, RenderContext... context) {
StringBuffer sb = new StringBuffer();
try
{
renderTemplate(s, sb, nullToken, 0, endTokens, null, context);
}
catch (Exception e)
{
Log4j.app.error("Exception in rendering method expression message emplate: " + e.getMessage(), e);
return nullToken;
}
return sb.toString();
}
private int renderTemplate(String src, StringBuffer dst, String nil, int i, String[] marks, StringBuffer end, RenderContext... context) {
int len = src.length();
while (i < len)
{
char c = src.charAt(i);
if (escape)
{
if (c=='\\')
{
i++;
char ch = src.charAt(i);
if(inSingleQuote)
{
if(ch=='\'')
{
inSingleQuote=false;
}
}
else if(inDoubleQuote)
{
if(ch=='"')
{
inDoubleQuote=false;
}
}
else
{
if(ch=='\'')
{
inSingleQuote=true;
}
else if(ch=='"')
{
inDoubleQuote=true;
}
}
dst.append(ch);
i++;
continue;
}
}
if(inSingleQuote)
{
if(c=='\'')
{
inSingleQuote=false;
}
}
else if(inDoubleQuote)
{
if(c=='"')
{
inDoubleQuote=false;
}
}
else
{
if(c=='\'')
{
inSingleQuote=true;
}
else if(c=='"')
{
inDoubleQuote=true;
}
}
// check for end marker
if (marks != null && !inSingleQuote && !inDoubleQuote)
{
for (int m = 0; m < marks.length; m++)
{
// If one of markers found
if (src.regionMatches(i, marks[m], 0, marks[m].length()))
{
// return marker if required
if (end != null)
{
end.append(marks[m]);
}
return i+marks[m].length();
}
}
}
// check for start of placeholder
if (src.regionMatches(i, placeholderStartToken, 0, lenPlaceholderStartToken))
{
i = renderPlaceholder(src, dst, nil, i, new ArrayList<String>(), context);
continue;
}
// just add plain character
if(c != '\'' && c!= '"')
{
dst.append(c);
}
i++;
}
return i;
}
/**
* Render a placeholder as follows:
*
* <<key>>: Simple render, key value map
* <<function(<<param1>>, <<param2>>)>> : Function object render
*
* #param src
* #param dst
* #param nil
* #param i
* #param params
* #param context
* #return
*/
private int renderPlaceholder(String src, StringBuffer dst, String nil, int i, List<String> params, RenderContext... context){
StringBuffer token = new StringBuffer(); // placeholder token
StringBuffer end = new StringBuffer(); // placeholder end marker
String value = null;
// Simple key
i = renderTemplate(src, token, nil, i+lenPlaceholderStartToken, endTokens, end, context);
String sToken = token.toString().trim();
String sEnd = end.toString().trim();
// This is method name
if(sEnd.equals("("))
{ // Method
functionStack.add(new MethodExpressionDescriptor(sToken));
}
else // Try to resolve value
{
if(sToken.startsWith(placeholderStartToken))
{
value = render(sToken, context);
}
else if(sToken.startsWith(prefix))
{
if(functionStack.size() > 0)
{
functionStack.peek().params.add(sToken.substring(1));
}
return i;
}
else
{
value = getParam(sToken, context);
}
}
if (sEnd.length() == 0 || sEnd.equals(placeholderEndToken))
{
// No method found but found the end of placeholder token
if(functionStack.size() == 0)
{
if(value != null)
{
dst.append(value);
}
else
{
dst.append(nil);
}
}
else
{
functionStack.peek().params.add(value);
}
}
else
{
if(value != null)
{
value = value.trim();
}
if(end.substring(0, 1).equals("(") ||
end.substring(0, 1).equals(marker))
{
// right hand side is remainder of placeholder
StringBuffer tmp = new StringBuffer();
end = new StringBuffer();
i = renderTemplate(src, tmp, nil, i, endTokens, end, context);
}
if(end.substring(0, 1).equals(")"))
{
if ( functionStack.size() > 0 )
{
// Pop method out of stack to invoke
MethodExpressionDescriptor descriptor = functionStack.pop();
if(functionStack.size() > 0 )
{
functionStack.peek().params.add(invokeMethodEvaluator(descriptor.function, descriptor.params.toArray(new String[0]), context));
}
else
{
dst.append(invokeMethodEvaluator(descriptor.function, descriptor.params.toArray(new String[0]), context));
}
end = new StringBuffer();
StringBuffer tmp = new StringBuffer();
i = renderTemplate(src, tmp, nil, i, endTokens, end, context);
}
}
}
return i;
}
protected String invokeMethodEvaluator(String method, String[] params, RenderContext... context){
StringBuffer result = new StringBuffer();
result.append("[ ")
.append(method)
.append(" ( ");
if(params != null)
{
for(int i=0; i<params.length; i++)
{
result.append(params[i]);
if(i != params.length-1)
{
result.append(" , ");
}
}
}
result.append(" ) ")
.append(" ] ");
return result.toString();
}
}