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/*******************************************************************************
* Copyright (c) 2001, 2007 Oracle Corporation 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:
* Oracle Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.jsf.common.metadata.internal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResourceChangeEvent;
import org.eclipse.core.resources.IResourceChangeListener;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jst.jsf.common.JSFCommonPlugin;
/**
* Creates instances of IMetaDataLocators and caches them so that there is only one instance of a particular locator
* when client requests one.
*/
public class MetaDataLocatorFactory
implements IResourceChangeListener {
private static MetaDataLocatorFactory INSTANCE = null;
private Map<String, IMetaDataLocator> _locators;
private static final boolean DEBUG = false;
/**
* @return singleton instance of the MetaDataLocatorFactory
*/
public synchronized static MetaDataLocatorFactory getInstance(){
if (INSTANCE == null){
INSTANCE = new MetaDataLocatorFactory();
ResourcesPlugin.getWorkspace().addResourceChangeListener(INSTANCE,
IResourceChangeEvent.PRE_CLOSE | IResourceChangeEvent.PRE_DELETE);
}
return INSTANCE;
}
private Map<String, IMetaDataLocator> getLocators() {
if (_locators == null){
_locators = new HashMap<String, IMetaDataLocator>();
}
return _locators;
}
/**
* @param locatorClassName - may NOT be null
* @param bundleId - may NOT be null
* @param project - may be null
* @return shared instance of IMetaDataLocator
* may return null if is IPathSensitiveMetaDataLocator and there is no project context
*/
public IMetaDataLocator getLocator(final String locatorClassName, final String bundleId, final IProject project){
final Class klass = JSFCommonPlugin.loadClass(locatorClassName, bundleId);
String key = getKey(locatorClassName, bundleId);
IMetaDataLocator locator = null;
try {
IMetaDataLocator tempLocator = (IMetaDataLocator)klass.newInstance();
if (tempLocator != null) {
if (tempLocator instanceof IPathSensitiveMetaDataLocator) {
if (project == null)
return null;
key = getKey(locatorClassName, project.getName());
}
locator = getLocators().get(key);
if (locator == null) {
locator = tempLocator;
if (locator instanceof IPathSensitiveMetaDataLocator)
((IPathSensitiveMetaDataLocator)locator).setProjectContext(project);
if (DEBUG)
System.out.println("Created locator: "+locator.toString()); //$NON-NLS-1$
getLocators().put(key, locator);
locator.startLocating();
}
}
} catch (InstantiationException e) {
JSFCommonPlugin.log(IStatus.ERROR, "Could not instantiate IMetaDataLocator: "+key, e); //$NON-NLS-1$
} catch (IllegalAccessException e) {
JSFCommonPlugin.log(IStatus.ERROR, "IllegalAccessException while creating IMetaDataLocator: "+key, e); //$NON-NLS-1$
}
return locator;
}
/**
* @param locatorClassName
* @param contextId - this may be the bundleID or the projectName if it is a path sensitive locator
* @return key
*/
private String getKey(final String locatorClassName, final String contextId) {
StringBuffer buf = new StringBuffer(contextId);
buf.append(":"); //$NON-NLS-1$
buf.append(locatorClassName);
return buf.toString();
}
/**
* Stops and disposes all locators
*/
public void dispose(){
ResourcesPlugin.getWorkspace().removeResourceChangeListener(this);
for (Iterator it=getLocators().values().iterator();it.hasNext();){
IMetaDataLocator locator = (IMetaDataLocator)it.next();
locator.stopLocating();
}
getLocators().clear();
}
/*
* (non-Javadoc)
*
* @see
* org.eclipse.core.resources.IResourceChangeListener#resourceChanged(org
* .eclipse.core.resources.IResourceChangeEvent)
*/
public void resourceChanged(final IResourceChangeEvent event) {
if (event.getType() == IResourceChangeEvent.PRE_CLOSE
|| event.getType() == IResourceChangeEvent.PRE_DELETE) {
// a project is closing - release and cleanup
final IProject aProject = (IProject) event.getResource();
if (aProject != null) {
List<String> locatorsToRemove = new ArrayList<String>();
for (Iterator it=getLocators().keySet().iterator();it.hasNext();){
String key = (String)it.next();
if (locatorIsForProject(key, aProject.getName())) {
locatorsToRemove.add(key);
}
}
if (! locatorsToRemove.isEmpty()) {
for (String key : locatorsToRemove) {
IMetaDataLocator locator = getLocators().get(key);
if (DEBUG)
System.out.println("Removed locator: "+locator.toString()); //$NON-NLS-1$
locator.stopLocating();
getLocators().remove(key);
}
}
}
}
}
private boolean locatorIsForProject(final String key, final String projectName) {
StringTokenizer t = new StringTokenizer(key, ":"); //$NON-NLS-1$
String contextId = t.nextToken();
if (contextId.equals(projectName))
return true;
return false;
}
}
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