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/*******************************************************************************
* Copyright (c) 2004, 2009 John Anvik and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* John Anvik - initial API and implementation
*******************************************************************************/
package org.eclipse.mylyn.internal.bugzilla.core.history;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.text.ParseException;
import java.util.Iterator;
import java.util.Locale;
import javax.security.auth.login.LoginException;
import javax.swing.text.html.HTML.Tag;
import org.apache.commons.lang.StringEscapeUtils;
import org.eclipse.mylyn.commons.net.HtmlStreamTokenizer;
import org.eclipse.mylyn.commons.net.HtmlTag;
import org.eclipse.mylyn.commons.net.HtmlStreamTokenizer.Token;
import org.eclipse.mylyn.internal.bugzilla.core.BugzillaLanguageSettings;
/**
* Parses Bugzilla bug activity page to fill in a BugActivity object
*
* @author John Anvik
*/
public class BugzillaTaskHistoryParser {
private final InputStream inStream;
private final String characterEncoding;
public BugzillaTaskHistoryParser(InputStream inStream, String characterEncoding) {
this.inStream = inStream;
this.characterEncoding = characterEncoding;
}
/**
* Parse the activity page for events
*
* @return A BugActivity object containing the activity history
*/
public TaskHistory retrieveHistory(BugzillaLanguageSettings bugzillaLanguageSettings) throws IOException,
ParseException, LoginException {
TaskHistory activity = new TaskHistory();
HtmlStreamTokenizer tokenizer = new HtmlStreamTokenizer(new BufferedReader(new InputStreamReader(inStream,
characterEncoding)), null);
boolean isTitle = false;
boolean possibleBadLogin = false;
String title = ""; //$NON-NLS-1$
for (Token token = tokenizer.nextToken(); token.getType() != Token.EOF; token = tokenizer.nextToken()) {
// make sure that bugzilla doesn't want us to login
if (token.getType() == Token.TAG && ((HtmlTag) (token.getValue())).getTagType() == Tag.TITLE
&& !((HtmlTag) (token.getValue())).isEndTag()) {
isTitle = true;
continue;
}
if (isTitle) {
// get all of the data from inside of the title tag
if (token.getType() != Token.TAG) {
title += ((StringBuffer) token.getValue()).toString().toLowerCase() + " "; //$NON-NLS-1$
continue;
} else if (token.getType() == Token.TAG && ((HtmlTag) token.getValue()).getTagType() == Tag.TITLE
&& ((HtmlTag) token.getValue()).isEndTag()) {
// check if we may have a problem with login by looking
// at
// the title of the page
boolean found = false;
for (Iterator<String> iterator = bugzillaLanguageSettings.getResponseForCommand(
BugzillaLanguageSettings.COMMAND_BAD_LOGIN).iterator(); iterator.hasNext() && !found;) {
String value = iterator.next().toLowerCase(Locale.ENGLISH);
found = found || title.indexOf(value) != -1;
}
if (found) {
possibleBadLogin = true;
}
isTitle = false;
title = ""; //$NON-NLS-1$
}
continue;
}
if (token.getType() == Token.TAG) {
HtmlTag tag = (HtmlTag) token.getValue();
// Skip till find <br> - "there can be only one"
if (tag.getTagType() == Tag.BR && !tag.isEndTag()) {
// skip tags until start of real data
while (true) {
token = tokenizer.nextToken();
if (token.getType() == Token.TAG) {
tag = (HtmlTag) token.getValue();
if ((tag.isEndTag() && tag.getTagType() == Tag.TR) || tag.getTagType() == Tag.P) {
break;
}
}
}
parseActivity(tokenizer, activity);
}
}
}
// if we don't have any keywords and suspect that there was a login
// problem, assume we had a login problem
if (activity.size() == 0 && possibleBadLogin) {
throw new LoginException("Bugzilla login information incorrect"); //$NON-NLS-1$
}
return activity;
}
/**
* Parse the events that have happened to the bug
*
* @param tokenizer
* the token stream
* @param activity
* the activity object to store the events in
* @return
*/
private void parseActivity(HtmlStreamTokenizer tokenizer, TaskHistory activity) throws IOException, ParseException {
HtmlTag tag;
for (Token token = tokenizer.nextToken(); token.getType() != Token.EOF; token = tokenizer.nextToken()) {
if (token.getType() == Token.TAG) {
tag = (HtmlTag) token.getValue();
// End of events
if (tag.getTagType() == Tag.TABLE && tag.isEndTag()) {
break;
}
// Get event entry
this.parseEvent(tokenizer, activity);
}
}
}
/**
* Parse an activity entry
*
* @param tokenizer
* the stream of tokens
* @param activity
* the activity object to store events in
*/
private void parseEvent(HtmlStreamTokenizer tokenizer, TaskHistory activity) {
HtmlTag tag;
int numChanges = 0;
try {
// Discover how many changes for this entry
for (Token token = tokenizer.nextToken(); token.getType() != Token.EOF; token = tokenizer.nextToken()) {
if (token.getType() == Token.TAG) {
tag = (HtmlTag) token.getValue();
if (tag.getTagType() == Tag.TD && tag.hasAttribute("rowspan")) { //$NON-NLS-1$
numChanges = tag.getIntAttribute("rowspan"); //$NON-NLS-1$
break;
}
}
}
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
}
String name = getData(tokenizer);
String date = getData(tokenizer);
String what, removed, added;
TaskRevision event;
for (int change = 0; change < numChanges; change++) {
what = getData(tokenizer);
removed = getData(tokenizer);
added = getData(tokenizer);
event = TaskRevision.createEvent(what, added);
event.setName(name);
event.setDate(date);
event.setRemoved(removed);
activity.addEvent(event);
}
}
private String getData(HtmlStreamTokenizer tokenizer) {
Token token;
HtmlTag tag;
StringBuffer sb = new StringBuffer();
try {
for (token = tokenizer.nextToken(); token.getType() != Token.EOF; token = tokenizer.nextToken()) {
if (token.getType() == Token.TAG) {
tag = (HtmlTag) token.getValue();
if (tag.getTagType() == Tag.TD && tag.isEndTag()) {
String data = StringEscapeUtils.unescapeHtml(sb.toString());
if (data.startsWith("\n") && (data.contains("Attachment") == false)) { //$NON-NLS-1$ //$NON-NLS-2$
data = ""; // empty field //$NON-NLS-1$
}
return data;
}
}
if (token.getType() == Token.TEXT) {
sb.append(token.toString());
}
}
} catch (IOException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
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