001    package org.apache.maven.artifact.resolver.filter;
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 org.apache.maven.artifact.Artifact;
023    
024    public class InversionArtifactFilter
025        implements ArtifactFilter
026    {
027        private final ArtifactFilter toInvert;
028    
029        public InversionArtifactFilter( ArtifactFilter toInvert )
030        {
031            this.toInvert = toInvert;
032        }
033    
034        public boolean include( Artifact artifact )
035        {
036            return !toInvert.include( artifact );
037        }
038    
039        @Override
040        public int hashCode()
041        {
042            int hash = 17;
043            hash = hash * 31 + toInvert.hashCode();
044            return hash;
045        }
046    
047        @Override
048        public boolean equals( Object obj )
049        {
050            if ( this == obj )
051            {
052                return true;
053            }
054            
055            if ( !( obj instanceof InversionArtifactFilter ) )
056            {
057                return false;
058            }
059            
060            InversionArtifactFilter other = (InversionArtifactFilter) obj;
061            
062            return toInvert.equals( other.toInvert );
063        }
064    
065    }