001    package org.apache.maven;
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.io.File;
023    import java.util.LinkedHashMap;
024    import java.util.List;
025    import java.util.Map;
026    
027    /**
028     * Signals a collision of two or more projects with the same g:a:v during a reactor build.
029     * 
030     * @author Benjamin Bentmann
031     */
032    public class DuplicateProjectException
033        extends MavenExecutionException
034    {
035    
036        private Map<String, List<File>> collisions;
037    
038        /**
039         * Creates a new exception with specified details.
040         * 
041         * @param message The message text, may be {@code null}.
042         * @param collisions The POM files of the projects that collided, indexed by their g:a:v, may be {@code null}.
043         */
044        public DuplicateProjectException( String message, Map<String, List<File>> collisions )
045        {
046            super( message, (File) null );
047    
048            this.collisions = ( collisions != null ) ? collisions : new LinkedHashMap<String, List<File>>();
049        }
050    
051        /**
052         * Gets the POM files of the projects that collided.
053         * 
054         * @return The POM files of the projects that collided, indexed by their g:a:v, never {@code null}.
055         */
056        public Map<String, List<File>> getCollisions()
057        {
058            return collisions;
059        }
060    
061    }