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