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/*******************************************************************************
* Copyright (c) 2003, 2005 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.componentcore.internal.builder;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.eclipse.core.resources.IProject;
public class DependencyGraph {
private static final DependencyGraph INSTANCE = new DependencyGraph();
private final Map dependencies = new HashMap();
public static DependencyGraph getInstance() {
return INSTANCE;
}
public IProject[] getReferencingComponents(IProject target) {
Set referencingComponents = internalGetReferencingComponents(target);
return (IProject[]) referencingComponents.toArray(new IProject[referencingComponents.size()]);
}
public void addReference(IProject target, IProject referencingComponent) {
internalGetReferencingComponents(target).add(referencingComponent);
}
public void removeReference(IProject target, IProject referencingComponent) {
internalGetReferencingComponents(target).remove(referencingComponent);
}
protected Set internalGetReferencingComponents(IProject target) {
Set referencingComponents = (Set) dependencies.get(target);
if(referencingComponents == null)
dependencies.put(target, (referencingComponents = new HashSet()));
return referencingComponents;
}
public void clear() {
dependencies.clear();
}
}
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