001    package 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    
022    import java.util.ArrayList;
023    import 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     */
031    public 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    }