package org.apache.maven.plugins.shade.resource;

 /*

  * 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.plugins.shade.relocation.Relocator;

 import org.codehaus.plexus.util.IOUtil;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.List;

 import java.util.Map;

 import java.util.jar.Attributes;

 import java.util.jar.JarEntry;

 import java.util.jar.JarFile;

 import java.util.jar.JarOutputStream;

 import java.util.jar.Manifest;

 /**

  * A resource processor that allows the arbitrary addition of attributes to

  * the first MANIFEST.MF that is found in the set of JARs being processed, or

  * to a newly created manifest for the shaded JAR.

  *

  * @author Jason van Zyl

  * @since 1.2

  */

 public class ManifestResourceTransformer

     implements ResourceTransformer

 {

     // Configuration

     private String mainClass;

     private Map<String, Attributes> manifestEntries;

     // Fields

     private boolean manifestDiscovered;

     private Manifest manifest;

     public boolean canTransformResource( String resource )

     {

         if ( JarFile.MANIFEST_NAME.equalsIgnoreCase( resource ) )

         {

             return true;

         }

         return false;

     }

     public void processResource( String resource, InputStream is, List<Relocator> relocators )

         throws IOException

     {

         // We just want to take the first manifest we come across as that's our project's manifest. This is the behavior

         // now which is situational at best. Right now there is no context passed in with the processing so we cannot

         // tell what artifact is being processed.

         if ( !manifestDiscovered )

         {

             manifest = new Manifest( is );

             manifestDiscovered = true;

             IOUtil.close( is );

         }

     }

     public boolean hasTransformedResource()

     {

         return true;

     }

     public void modifyOutputStream( JarOutputStream jos )

         throws IOException

     {

         // If we didn't find a manifest, then let's create one.

         if ( manifest == null )

         {

             manifest = new Manifest();

         }

         Attributes attributes = manifest.getMainAttributes();

         if ( mainClass != null )

         {

             attributes.put( Attributes.Name.MAIN_CLASS, mainClass );

         }

         if ( manifestEntries != null )

         {

             for ( Map.Entry<String,Attributes> entry : manifestEntries.entrySet() )

             {

                 attributes.put( new Attributes.Name( entry.getKey() ), entry.getValue() );

             }

         }

         jos.putNextEntry( new JarEntry( JarFile.MANIFEST_NAME ) );

         manifest.write( jos );

     }

 }