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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.util;
import java.util.*;
import org.eclipse.core.runtime.*;
import org.eclipse.core.runtime.model.*;
import org.eclipse.help.internal.HelpBasePlugin;
import org.eclipse.help.internal.util.*;
/**
* Table of plugins. Records all plugins, their version, corresponding fragments versions
* The values are String in format:
* pluginID\npluginVersion\nfragment1ID\nfragment1Version\nfragment2ID\nfragment2Version
*/
public class PluginVersionInfo extends HelpProperties {
// Separates plugins and versions in value strings
static final String SEPARATOR = "\n";
Plugin basePlugin = HelpBasePlugin.getDefault();
boolean doComparison = true;
boolean hasChanged = false;
boolean ignoreSavedVersions;
Collection added = new ArrayList();
Collection removed = new ArrayList();
/**
* Creates table of current contributing plugins and their fragments with versions.
* @param name the name of the file to serialize the data to
* @param it iterator of current contributions (IConfigurationElement type)
* @param basePlugin use this plugin's state location to store the data
* @param ignoreSavedVersion if true, will cause detect change
* to ignore saved plugin version and behave like there was nothing saved
*/
public PluginVersionInfo(
String name,
Iterator it,
Plugin basePlugin,
boolean ignoreSavedVersions) {
super(name, basePlugin);
this.basePlugin = basePlugin;
this.ignoreSavedVersions = ignoreSavedVersions;
if (it == null)
return;
// create table of current contributions
for (; it.hasNext();) {
IPluginDescriptor plugin = (IPluginDescriptor) it.next();
StringBuffer pluginVersionAndFragments = new StringBuffer();
pluginVersionAndFragments.append(plugin.getUniqueIdentifier());
pluginVersionAndFragments.append(SEPARATOR);
pluginVersionAndFragments.append(
plugin.getVersionIdentifier().toString());
if (plugin instanceof PluginDescriptorModel) {
PluginFragmentModel[] fragmentModels =
((PluginDescriptorModel) plugin).getFragments();
if (fragmentModels != null) {
for (int f = 0; f < fragmentModels.length; f++) {
pluginVersionAndFragments.append(SEPARATOR);
pluginVersionAndFragments.append(
fragmentModels[f].getId());
pluginVersionAndFragments.append(SEPARATOR);
pluginVersionAndFragments.append(
fragmentModels[f].getVersion());
}
}
}
this.put(
plugin.getUniqueIdentifier(),
pluginVersionAndFragments.toString());
}
}
/**
* Detects changes in contributions or their version
* since last time the contribution table was saved.
* @return true if contributions have changed
*/
public boolean detectChange() {
if (!doComparison)
return hasChanged;
// Create table of contributions present before last save()
HelpProperties oldContrs = new HelpProperties(this.name, basePlugin);
if (!ignoreSavedVersions) {
oldContrs.restore();
}
// check if contributions changed
hasChanged = false;
for (Enumeration keysEnum = this.keys(); keysEnum.hasMoreElements();) {
String oneContr = (String) keysEnum.nextElement();
if (!oldContrs.containsKey(oneContr)) {
// plugin has been added
added.add(oneContr);
} else {
String versions = (String) this.get(oneContr);
String oldVersions = (String) oldContrs.get(oneContr);
if (!compare(versions, oldVersions)) {
// plugin version changed or fragments changed
added.add(oneContr);
}
}
}
for (Enumeration keysEnum = oldContrs.keys();
keysEnum.hasMoreElements();
) {
String oneContr = (String) keysEnum.nextElement();
if (!this.containsKey(oneContr)) {
// plugin has been removed
removed.add(oneContr);
} else {
String versions = (String) this.get(oneContr);
String oldVersions = (String) oldContrs.get(oneContr);
if (!compare(versions, oldVersions)) {
// plugin version changed or fragments changed
removed.add(oneContr);
}
}
}
hasChanged = added.size() > 0 || removed.size() > 0;
doComparison = false;
return hasChanged;
}
/**
* @return String - Collection of IDs of contributions that were added
* or upgraded
*/
public Collection getAdded() {
if (doComparison)
detectChange();
return added;
}
/**
* @return String - Collection of IDs of contributions that were removed
* or upgraded
*/
public Collection getRemoved() {
if (doComparison)
detectChange();
return removed;
}
/**
* Saves contributions to a file.
* After this method is called, calls to detectChange() will return false.
* @return true if operation was successful
*/
public boolean save() {
if (super.save()) {
doComparison = false;
hasChanged = false;
ignoreSavedVersions = false;
added = new ArrayList();
removed = new ArrayList();
return true;
}
return false;
}
/**
* Compares plugins and versions represented as a string for equality
* String have form id1\nverison1\nid2\nversion2
* String are equal of they contain the same set of IDs and their corresponding version equal
* @return true if plugins and versions match
*/
private boolean compare(String versions, String oldVersions) {
Map versionMap = new HashMap();
for (StringTokenizer t =
new StringTokenizer(versions, SEPARATOR, false);
t.hasMoreTokens();
) {
String pluginOrFragment = t.nextToken();
if (t.hasMoreTokens()) {
versionMap.put(pluginOrFragment, t.nextToken());
}
}
Map oldVersionMap = new HashMap();
for (StringTokenizer t =
new StringTokenizer(oldVersions, SEPARATOR, false);
t.hasMoreTokens();
) {
String pluginOrFragment = t.nextToken();
if (t.hasMoreTokens()) {
oldVersionMap.put(pluginOrFragment, t.nextToken());
}
}
return versionMap.equals(oldVersionMap);
}
}
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