package org.apache.maven.plugin.war.util;

 /*

  * 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 com.thoughtworks.xstream.XStream;

 import com.thoughtworks.xstream.io.xml.DomDriver;

 import org.apache.maven.model.Dependency;

 import org.codehaus.plexus.util.IOUtil;

 import org.codehaus.plexus.util.ReaderFactory;

 import org.codehaus.plexus.util.WriterFactory;

 import java.io.File;

 import java.io.IOException;

 import java.io.Reader;

 import java.io.Writer;

 /**

  * Serializes {@link WebappStructure} back and forth.

  *

  * @author Stephane Nicoll

  * @version $Id: WebappStructureSerializer.java 985593 2010-08-14 22:12:09Z dennisl $

  */

 public class WebappStructureSerializer

 {

     private static final XStream xStream;

     static

     {

         xStream = new XStream( new DomDriver() );

         // Register aliases

         xStream.alias( "webapp-structure", WebappStructure.class );

         xStream.alias( "path-set", PathSet.class );

         xStream.alias( "dependency", Dependency.class );

     }

     /**

      * Creates a new instance of the serializer.

      */

     public WebappStructureSerializer()

     {

     }

     /**

      * Reads the {@link WebappStructure} from the specified file.

      *

      * @param file the file containing the webapp structure

      * @return the webapp structure

      * @throws IOException if an error occurred while reading the structure

      */

     public WebappStructure fromXml( File file )

         throws IOException

     {

         Reader reader = null;

         try

         {

             reader = ReaderFactory.newXmlReader( file );

             return (WebappStructure) xStream.fromXML( reader );

         }

         finally

         {

             IOUtil.close( reader );

         }

     }

     /**

      * Saves the {@link WebappStructure} to the specified file.

      *

      * @param webappStructure the structure to save

      * @param targetFile      the file to use to save the structure

      * @throws IOException if an error occurred while saving the webapp structure

      */

     public void toXml( WebappStructure webappStructure, File targetFile )

         throws IOException

     {

         Writer writer = null;

         try

         {

             if ( !targetFile.getParentFile().exists() && !targetFile.getParentFile().mkdirs() )

             {

                 throw new IOException(

                     "Could not create parent [" + targetFile.getParentFile().getAbsolutePath() + "]" );

             }

             if ( !targetFile.exists() && !targetFile.createNewFile() )

             {

                 throw new IOException( "Could not create file [" + targetFile.getAbsolutePath() + "]" );

             }

             writer = WriterFactory.newXmlWriter( targetFile );

             xStream.toXML( webappStructure, writer );

         }

         finally

         {

             IOUtil.close( writer );

         }

     }

 }