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.Collection;
024
025/**
026 * This is the main graph data structure used by the RepositorySystem to present tree and graph objects.
027 *
028 * @author Oleg Gusakov
029 *
030 */
031public class MetadataGraph
032{
033    /** all graph nodes */
034    Collection<MetadataGraphNode> nodes;
035
036    /** entry point for tree-like structures */
037    MetadataGraphNode entry;
038
039    public MetadataGraph( MetadataGraphNode entry )
040    {
041        this();
042
043        this.entry = entry;
044    }
045
046    public MetadataGraph()
047    {
048        nodes = new ArrayList<MetadataGraphNode>( 64 );
049    }
050
051    public void addNode( MetadataGraphNode node )
052    {
053        nodes.add( node );
054    }
055
056    /**
057     * find a node by the GAV (metadata)
058     *
059     * @param md
060     * @return
061     */
062    public MetadataGraphNode findNode( MavenArtifactMetadata md )
063    {
064        for ( MetadataGraphNode mgn : nodes )
065        {
066            if ( mgn.metadata.equals( md ) )
067            {
068                return mgn;
069            }
070        }
071
072        MetadataGraphNode node = new MetadataGraphNode( md );
073        addNode( node );
074        return node;
075    }
076
077    /**
078     * getter
079     *
080     * @return
081     */
082    public MetadataGraphNode getEntry()
083    {
084        return entry;
085    }
086
087    /**
088     * getter
089     *
090     * @return
091     */
092    public Collection<MetadataGraphNode> getNodes()
093    {
094        return nodes;
095    }
096}