package org.apache.maven.artifact.resolver.filter;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.artifact.Artifact;

public class InversionArtifactFilter
    implements ArtifactFilter
{
    private final ArtifactFilter toInvert;

    public InversionArtifactFilter( ArtifactFilter toInvert )
    {
        this.toInvert = toInvert;
    }

    public boolean include( Artifact artifact )
    {
        return !toInvert.include( artifact );
    }

    @Override
    public int hashCode()
    {
        int hash = 17;
        hash = hash * 31 + toInvert.hashCode();
        return hash;
    }

    @Override
    public boolean equals( Object obj )
    {
        if ( this == obj )
        {
            return true;
        }
        
        if ( !( obj instanceof InversionArtifactFilter ) )
        {
            return false;
        }
        
        InversionArtifactFilter other = (InversionArtifactFilter) obj;
        
        return toInvert.equals( other.toInvert );
    }

}
