001package org.apache.maven.repository;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import java.util.ArrayList;
023import java.util.List;
024
025/**
026 * MetadataGraph node - as it's a directed graph - holds adjacency lists for incident and exident nodes
027 *
028 * @author Oleg Gusakov
029 *
030 */
031public class MetadataGraphNode
032{
033    /** node payload */
034    MavenArtifactMetadata metadata;
035
036    /** nodes, incident to this (depend on me) */
037    List<MetadataGraphNode> inNodes;
038
039    /** nodes, exident to this (I depend on) */
040    List<MetadataGraphNode> exNodes;
041
042    public MetadataGraphNode()
043    {
044        inNodes = new ArrayList<MetadataGraphNode>( 4 );
045        exNodes = new ArrayList<MetadataGraphNode>( 8 );
046    }
047
048    public MetadataGraphNode( MavenArtifactMetadata metadata )
049    {
050        this();
051        this.metadata = metadata;
052    }
053
054    public MetadataGraphNode addIncident( MetadataGraphNode node )
055    {
056        inNodes.add( node );
057        return this;
058    }
059
060    public MetadataGraphNode addExident( MetadataGraphNode node )
061    {
062        exNodes.add( node );
063        return this;
064    }
065
066    @Override
067    public boolean equals( Object obj )
068    {
069        if ( obj == null )
070        {
071            return false;
072        }
073
074        if ( MetadataGraphNode.class.isAssignableFrom( obj.getClass() ) )
075        {
076            MetadataGraphNode node2 = (MetadataGraphNode) obj;
077
078            if ( node2.metadata == null )
079            {
080                return metadata == null;
081            }
082
083            return metadata != null && metadata.toString().equals( node2.metadata.toString() );
084        }
085        else
086        {
087            return super.equals( obj );
088        }
089    }
090
091    @Override
092    public int hashCode()
093    {
094        if ( metadata == null )
095        {
096            return super.hashCode();
097        }
098
099        return metadata.toString().hashCode();
100    }
101}