/*******************************************************************************
* Copyright (c) 2005, 2006 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.core.internal.resources.mapping;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.core.internal.utils.Policy;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.resources.mapping.IModelProviderDescriptor;
import org.eclipse.core.resources.mapping.ModelProvider;
import org.eclipse.core.runtime.*;
public class ModelProviderManager {
private static Map descriptors;
private static ModelProviderManager instance;
public synchronized static ModelProviderManager getDefault() {
if (instance == null) {
instance = new ModelProviderManager();
}
return instance;
}
private void detectCycles() {
// TODO Auto-generated method stub
}
public IModelProviderDescriptor getDescriptor(String id) {
lazyInitialize();
return (IModelProviderDescriptor) descriptors.get(id);
}
public IModelProviderDescriptor[] getDescriptors() {
lazyInitialize();
return (IModelProviderDescriptor[]) descriptors.values().toArray(new IModelProviderDescriptor[descriptors.size()]);
}
public ModelProvider getModelProvider(String modelProviderId) throws CoreException {
IModelProviderDescriptor desc = getDescriptor(modelProviderId);
if (desc == null)
return null;
return desc.getModelProvider();
}
protected void lazyInitialize() {
if (descriptors != null)
return;
IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(ResourcesPlugin.PI_RESOURCES, ResourcesPlugin.PT_MODEL_PROVIDERS);
IExtension[] extensions = point.getExtensions();
descriptors = new HashMap(extensions.length * 2 + 1);
for (int i = 0, imax = extensions.length; i < imax; i++) {
IModelProviderDescriptor desc = null;
try {
desc = new ModelProviderDescriptor(extensions[i]);
} catch (CoreException e) {
Policy.log(e);
}
if (desc != null)
descriptors.put(desc.getId(), desc);
}
//do cycle detection now so it only has to be done once
//cycle detection on a graph subset is a pain
detectCycles();
}
}