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/***************************************************************************************************
* Copyright (c) 2003, 2004 IBM 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: IBM Corporation - initial API and implementation
**************************************************************************************************/
package org.eclipse.wst.common.internal.emf.utilities;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.URIConverter;
public class ResourceDependencyRegister {
protected static Map GLOBAL_DEPENDENCIES = new HashMap();
private static String RESOURCE_DEPENDENCY_TYPE = "ResourceDependencyAdapter"; //$NON-NLS-1$
protected Map localDependencies = new HashMap();
class ResourceDependencyAdapter extends AdapterImpl {
Resource dependentResource;
ResourceDependencyAdapter(Resource aDependentResource) {
dependentResource = aDependentResource;
dependentResource.eAdapters().add(this);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.impl.AdapterImpl#isAdapterForType(java.lang.Object)
*/
public boolean isAdapterForType(Object type) {
return RESOURCE_DEPENDENCY_TYPE.equals(type);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.impl.AdapterImpl#notifyChanged(org.eclipse.emf.common.notify.Notification)
*/
public void notifyChanged(Notification msg) {
//Listen for unloads and removes
switch (msg.getFeatureID(null)) {
case Resource.RESOURCE__IS_LOADED :
if (msg.getNotifier() != dependentResource && msg.getOldBooleanValue() && !msg.getNewBooleanValue())
dependentResource.unload();
break;
case Resource.RESOURCE__RESOURCE_SET :
if (msg.getOldValue() != null && msg.getNewValue() == null) {
if (msg.getNotifier() == dependentResource)
((Resource) getTarget()).eAdapters().remove(this);
else {
ResourceSet set = dependentResource.getResourceSet();
if (set != null)
set.getResources().remove(dependentResource);
}
}
break;
}
}
}
class ResourceSetListener extends AdapterImpl {
/*
* (non-Javadoc)
*
* @see org.eclipse.emf.common.notify.impl.AdapterImpl#notifyChanged(org.eclipse.emf.common.notify.Notification)
*/
public void notifyChanged(Notification msg) {
if (msg.getEventType() == Notification.ADD)
proccessAddedResource((ResourceSet) msg.getNotifier(), (Resource) msg.getNewValue());
}
}
/**
* Register a dependency between two URIs. The first parameter, aURIString, is the one that
* dependentUriString depends on.
*
* @param aUriString
* java.lang.String
* @param dependentUriString
* java.lang.String
*/
public static void registerDependency(URI targetURI, URI dependentURI) {
if (targetURI != null && dependentURI != null) {
GLOBAL_DEPENDENCIES.put(dependentURI, targetURI);
}
}
public ResourceDependencyRegister(ResourceSet aResourceSet) {
initialize(aResourceSet);
}
ResourceDependencyRegister() {
super();
}
/**
* @param aResourceSet
*/
protected void initialize(ResourceSet aResourceSet) {
if (aResourceSet == null)
throw new NullPointerException("The ResourceSet cannot be null."); //$NON-NLS-1$
initializeLocalDependencies(aResourceSet);
setupDependencyAdapters(aResourceSet);
setupResourceSetListener(aResourceSet);
}
/**
* @param aResourceSet
*/
protected void setupResourceSetListener(ResourceSet aResourceSet) {
aResourceSet.eAdapters().add(new ResourceSetListener());
}
/**
* @param aResourceSet
* @return
*/
protected void setupDependencyAdapters(ResourceSet aResourceSet) {
if (!aResourceSet.getResources().isEmpty()) {
Iterator it = localDependencies.entrySet().iterator();
Map.Entry entry;
URI dependentURI, targetURI;
while (it.hasNext()) {
entry = (Map.Entry) it.next();
dependentURI = (URI) entry.getKey();
targetURI = (URI) entry.getValue();
setupDependencyAdapter(aResourceSet, dependentURI, targetURI);
}
}
}
/**
* @param aResourceSet
* @param dependentURI
* @param targetURI
* @return
*/
protected void setupDependencyAdapter(ResourceSet aResourceSet, URI dependentURI, URI targetURI) {
Resource dependent = aResourceSet.getResource(dependentURI, false);
if (dependent != null)
setupDependencyAdapter(dependent, targetURI, aResourceSet);
}
protected void setupDependencyAdapter(Resource dependent, URI targetURI, ResourceSet aResourceSet) {
Resource target = aResourceSet.getResource(targetURI, false);
if (target == null)
target = aResourceSet.createResource(targetURI);
target.eAdapters().add(new ResourceDependencyAdapter(dependent));
}
/**
* @param aResourceSet
*/
protected void initializeLocalDependencies(ResourceSet aResourceSet) {
URIConverter converter = aResourceSet.getURIConverter();
initializeLocalDependencies(converter);
}
/**
* @param aResourceSet
*/
protected void initializeLocalDependencies(URIConverter aConverter) {
Iterator it = GLOBAL_DEPENDENCIES.entrySet().iterator();
Map resolved = new HashMap();
Map.Entry entry;
URI key, value;
while (it.hasNext()) {
entry = (Map.Entry) it.next();
key = (URI) entry.getKey();
value = (URI) entry.getValue();
key = normalize(key, aConverter, resolved);
value = normalize(value, aConverter, resolved);
localDependencies.put(key, value);
}
}
/**
* @param relativeURI
* @param converter
* @param resolved
* @return
*/
protected URI normalize(URI relativeURI, URIConverter converter, Map resolved) {
URI result = (URI) resolved.get(relativeURI);
if (result == null) {
result = converter.normalize(relativeURI);
resolved.put(relativeURI, result);
}
return result;
}
/**
* @param set
* @param resource
*/
protected void proccessAddedResource(ResourceSet set, Resource resource) {
URI targetURI = (URI) localDependencies.get(resource.getURI());
if (targetURI != null)
setupDependencyAdapter(resource, targetURI, set);
}
}
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