001/*****************************************************************************
002 * Copyright (C) PicoContainer Organization. All rights reserved.            *
003 * ------------------------------------------------------------------------- *
004 * The software in this package is published under the terms of the BSD      *
005 * style license a copy of which has been included with this distribution in *
006 * the LICENSE.txt file.                                                     *
007 *                                                                           *
008 * Original code by                                                          *
009 *****************************************************************************/
010package org.picocontainer.gems.monitors.prefuse;
011
012import java.util.HashSet;
013import java.util.Set;
014
015import org.picocontainer.gems.monitors.ComponentDependencyMonitor.Dependency;
016
017/**
018 * Understands non-duplicated dependencies.
019 * 
020 * @author Peter Barry
021 * @author Kent R. Spillner
022 */
023public final class DependencySet implements ComponentDependencyListener {
024
025    private final Set uniqueDependencies = new HashSet();
026
027    private final ComponentDependencyListener listener;
028
029    public DependencySet(final ComponentDependencyListener listener) {
030        this.listener = listener;
031    }
032
033    public void addDependency(final Dependency dependency) {
034        if (uniqueDependencies.add(dependency)) {
035            listener.addDependency(dependency);
036        }
037    }
038
039    public Dependency[] getDependencies() {
040        return (Dependency[]) uniqueDependencies.toArray(new Dependency[uniqueDependencies.size()]);
041    }
042}