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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.help.internal.search;
import org.apache.lucene.analysis.*;
import org.eclipse.core.runtime.*;
import org.eclipse.help.internal.*;
import org.eclipse.help.internal.util.*;
/**
* Text Analyzer Descriptor. Encapsulates Lucene Analyzer
*/
public class AnalyzerDescriptor {
private Analyzer luceneAnalyzer;
private String id;
private String lang;
/**
* Constructor
*/
public AnalyzerDescriptor(String locale) {
// try creating the analyzer for the specified locale (usually lang_country)
this.luceneAnalyzer = createAnalyzer(locale);
// try creating configured analyzer for the language only
if (this.luceneAnalyzer == null) {
String language = null;
if (locale.length() > 2) {
language = locale.substring(0, 2);
this.luceneAnalyzer = createAnalyzer(language);
}
}
// if all fails, create default analyzer
if (this.luceneAnalyzer == null) {
this.id =
HelpBasePlugin.getDefault().getDescriptor().getUniqueIdentifier()
+ "#"
+ HelpBasePlugin
.getDefault()
.getDescriptor()
.getVersionIdentifier()
.toString();
this.luceneAnalyzer = new DefaultAnalyzer(locale);
this.lang = locale;
}
}
/**
* Gets the analyzer.
* @return Returns a Analyzer
*/
public Analyzer getAnalyzer() {
return new SmartAnalyzer(lang, luceneAnalyzer);
}
/**
* Gets the id.
* @return Returns a String
*/
public String getId() {
return id;
}
/**
* Gets the language for the analyzer
* @return Returns a String
*/
public String getLang() {
return lang;
}
/**
* Creates analyzer for a locale,
* if it is configured in the org.eclipse.help.luceneAnalyzer
* extension point. The identifier of the analyzer and locale and lang are also set.
* @return Analyzer or null if no analyzer is configured
* for given locale.
*/
private Analyzer createAnalyzer(String locale) {
// find extension point
IConfigurationElement configElements[] =
Platform.getPluginRegistry().getConfigurationElementsFor(
HelpBasePlugin.PLUGIN_ID,
"luceneAnalyzer");
for (int i = 0; i < configElements.length; i++) {
if (!configElements[i].getName().equals("analyzer"))
continue;
String analyzerLocale = configElements[i].getAttribute("locale");
if (analyzerLocale == null || !analyzerLocale.equals(locale))
continue;
try {
Object analyzer =
configElements[i].createExecutableExtension("class");
if (!(analyzer instanceof Analyzer))
continue;
else {
String pluginId =
configElements[i]
.getDeclaringExtension()
.getDeclaringPluginDescriptor()
.getUniqueIdentifier();
String pluginVersion =
configElements[i]
.getDeclaringExtension()
.getDeclaringPluginDescriptor()
.getVersionIdentifier()
.toString();
this.luceneAnalyzer = (Analyzer) analyzer;
this.id = pluginId + "#" + pluginVersion;
this.lang = locale;
if (HelpBasePlugin.PLUGIN_ID.equals(pluginId)) {
// The analyzer is contributed by help plugin.
// Continue in case there is another analyzer for the same locale
// let another analyzer take precendence over one from help
} else {
// the analyzer does not come from help
return this.luceneAnalyzer;
}
}
} catch (CoreException ce) {
HelpBasePlugin.logError(
Resources.getString(
"ES23",
configElements[i].getAttribute("class"),
locale),
ce);
}
}
return this.luceneAnalyzer;
}
/**
* Checks whether analyzer is compatible with a given analyzer
* @param analyzerId id of analyzer used in the past by the index;
* id has a form: pluginID#pluginVersion
* @return true when it is known that given analyzer is compatible with
* this analyzer
*/
public boolean isCompatible(String analyzerId) {
if (id.equals(analyzerId)) {
return true;
}
// analyzers between versions 2.0.1 and 3.0.0 of org.eclipse.help plugin
// are compatible (logic unchanged), index can be preserved between them
if (analyzerId.compareTo(HelpBasePlugin.PLUGIN_ID + "#2.0.1") >= 0
&& analyzerId.compareTo(HelpBasePlugin.PLUGIN_ID + "#3.0.0") <= 0
&& id.compareTo(HelpBasePlugin.PLUGIN_ID + "#2.0.1") >= 0
&& id.compareTo(HelpBasePlugin.PLUGIN_ID + "#3.0.0") <= 0) {
return true;
}
return false;
}
}
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