package org.apache.maven.shared.dependency.graph.internal;
   
   /*
    * 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.project.MavenProject;
  
  /**
   * Uniquely defines an artifact by groupId, artifactId and version.
   */
  final class ArtifactKey
  {
      private static final int HASH_PRIME = 31;
  
      private final String groupId;
      private final String artifactId;
      private final String version;
  
      ArtifactKey( String groupId, String artifactId, String version )
      {
          this.groupId = groupId;
          this.artifactId = artifactId;
          this.version = version;
      }
  
      public ArtifactKey( MavenProject project )
      {
          this( project.getGroupId(), project.getArtifactId(), project.getVersion() );
      }
  
      @Override
      public boolean equals( Object o )
      {
          if ( this == o )
          {
              return true;
          }
  
          if ( !( o instanceof ArtifactKey ) )
          {
              return false;
          }
  
          ArtifactKey that = (ArtifactKey) o;
  
          return artifactId.equals( that.artifactId ) && groupId.equals( that.groupId ) && version.equals( that.version );
      }
  
      @Override
      public int hashCode()
      {
          int result = groupId.hashCode();
          result = HASH_PRIME * result + artifactId.hashCode();
          result = HASH_PRIME * result + version.hashCode();
          return result;
      }
  }