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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.core.client.listeners;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.team.internal.ccvs.core.CVSException;
import org.eclipse.team.internal.ccvs.core.util.Assert;
import org.eclipse.team.internal.ccvs.core.Policy;
/**
* This class extracts matches server lines to expected patterns and extracts
* required information from the line.
*/
public class ServerMessageLineMatcher {
protected static final Pattern VARIABLE_MATCHING_PATTERN = Pattern.compile("(\\((\\w*):.*:\\2\\))"); //$NON-NLS-1$
Pattern pattern;
String[] variables;
public ServerMessageLineMatcher(String template, String[] expectedVariables) throws CVSException {
// Extract the variable names from the template
Matcher matcher = VARIABLE_MATCHING_PATTERN.matcher(template);
List variables = new ArrayList();
while (matcher.find()) {
if (matcher.groupCount() != 2) {
throw new CVSException(Policy.bind("ServerMessageLineMatcher.5", template)); //$NON-NLS-1$
}
variables.add(matcher.group(2));
}
ensureMatches(template, variables, expectedVariables);
this.variables = (String[]) variables.toArray(new String[variables.size()]);
// Modify the template so it can be used to match message lines from the server
// (i.e. remove the variable markup)
for (Iterator iter = variables.iterator(); iter.hasNext();) {
String element = (String) iter.next();
template = template.replaceAll(element + ":", ""); //$NON-NLS-1$ //$NON-NLS-2$
template = template.replaceAll(":" + element, ""); //$NON-NLS-1$ //$NON-NLS-2$
}
// Ensure that the number of groups in the pattern match the number of variables
int count = 0;
int start = -1;
while ((start = template.indexOf('(', start + 1)) != -1) {
count++;
}
if (count != variables.size()) {
throw new CVSException(Policy.bind("ServerMessageLineMatcher.6", template)); //$NON-NLS-1$
}
// Create the pattern fir matching lines from the server
this.pattern = Pattern.compile(template);
}
/*
* Throw an exception if the found variables do not match the expected variables
*/
private void ensureMatches(String template, List variables, String[] expectedVariables) throws CVSException {
for (int i = 0; i < expectedVariables.length; i++) {
String expected = expectedVariables[i];
if (!variables.contains(expected)) {
throw new CVSException(Policy.bind("ServerMessageLineMatcher.7", expected, template)); //$NON-NLS-1$
}
}
}
public Map processServerMessage(String line) {
Matcher matcher = pattern.matcher(line);
if (!matcher.find()) return null;
Assert.isTrue(matcher.groupCount() == variables.length);
Map result = new HashMap();
for (int i = 1; i <= matcher.groupCount(); i++) {
result.put(variables[i - 1], matcher.group(i));
}
return result;
}
public boolean matches(String line) {
Matcher matcher = pattern.matcher(line);
return (matcher.find());
}
}
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