package org.eclipse.aether.util.artifact;
   
   /*
    * 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 java.io.File;
  import java.util.Map;
  
  import org.eclipse.aether.artifact.AbstractArtifact;
  import org.eclipse.aether.artifact.Artifact;
  
  /**
   * An artifact that delegates to another artifact instance. This class serves as a base for subclasses that want to
   * carry additional data fields.
   */
  public abstract class DelegatingArtifact
      extends AbstractArtifact
  {
  
      private final Artifact delegate;
  
      /**
       * Creates a new artifact instance that delegates to the specified artifact.
       * 
       * @param delegate The artifact to delegate to, must not be {@code null}.
       */
      protected DelegatingArtifact( Artifact delegate )
      {
          if ( delegate == null )
          {
              throw new IllegalArgumentException( "delegate artifact not specified" );
          }
          this.delegate = delegate;
      }
  
      /**
       * Creates a new artifact instance that delegates to the specified artifact. Subclasses should use this hook to
       * instantiate themselves, taking along any data from the current instance that was added.
       * 
       * @param delegate The artifact to delegate to, must not be {@code null}.
       * @return The new delegating artifact, never {@code null}.
       */
      protected abstract DelegatingArtifact newInstance( Artifact delegate );
  
      public String getGroupId()
      {
          return delegate.getGroupId();
      }
  
      public String getArtifactId()
      {
          return delegate.getArtifactId();
      }
  
      public String getVersion()
      {
          return delegate.getVersion();
      }
  
      public Artifact setVersion( String version )
      {
          Artifact artifact = delegate.setVersion( version );
          if ( artifact != delegate )
          {
              return newInstance( artifact );
          }
          return this;
      }
  
      public String getBaseVersion()
      {
          return delegate.getBaseVersion();
      }
  
      public boolean isSnapshot()
      {
          return delegate.isSnapshot();
      }
  
      public String getClassifier()
      {
          return delegate.getClassifier();
      }
 
     public String getExtension()
     {
         return delegate.getExtension();
     }
 
     public File getFile()
     {
         return delegate.getFile();
     }
 
     public Artifact setFile( File file )
     {
         Artifact artifact = delegate.setFile( file );
         if ( artifact != delegate )
         {
             return newInstance( artifact );
         }
         return this;
     }
 
     public String getProperty( String key, String defaultValue )
     {
         return delegate.getProperty( key, defaultValue );
     }
 
     public Map<String, String> getProperties()
     {
         return delegate.getProperties();
     }
 
     public Artifact setProperties( Map<String, String> properties )
     {
         Artifact artifact = delegate.setProperties( properties );
         if ( artifact != delegate )
         {
             return newInstance( artifact );
         }
         return this;
     }
 
     @Override
     public boolean equals( Object obj )
     {
         if ( obj == this )
         {
             return true;
         }
 
         if ( obj instanceof DelegatingArtifact )
         {
             return delegate.equals( ( (DelegatingArtifact) obj ).delegate );
         }
 
         return delegate.equals( obj );
     }
 
     @Override
     public int hashCode()
     {
         return delegate.hashCode();
     }
 
     @Override
     public String toString()
     {
         return delegate.toString();
     }
 
 }