package org.apache.maven.archetype.source;
   
   /*
    * 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.io.IOException;
  import java.io.Reader;
  import java.io.Writer;
  
  import org.apache.maven.archetype.catalog.ArchetypeCatalog;
  import org.apache.maven.archetype.catalog.io.xpp3.ArchetypeCatalogXpp3Reader;
  import org.apache.maven.archetype.catalog.io.xpp3.ArchetypeCatalogXpp3Writer;
  import org.codehaus.plexus.logging.AbstractLogEnabled;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.WriterFactory;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  /**
   * @author Jason van Zyl
   */
  public abstract  class CatalogArchetypeDataSource
      extends AbstractLogEnabled
      implements ArchetypeDataSource
  {
      public static final String ARCHETYPE_CATALOG_PROPERTY = "file";
  
      protected void writeLocalCatalog( ArchetypeCatalog catalog, File catalogFile )
          throws ArchetypeDataSourceException
      {
          Writer writer = null;
          try
          {
              writer = WriterFactory.newXmlWriter( catalogFile );
  
              ArchetypeCatalogXpp3Writer catalogWriter = new ArchetypeCatalogXpp3Writer();
  
              catalogWriter.write( writer, catalog );
          }
          catch ( IOException e )
          {
              throw new ArchetypeDataSourceException( "Error writing archetype catalog.", e );
          }
          finally
          {
              IOUtil.close( writer );
          }
      }
  
      protected ArchetypeCatalog readCatalog( Reader reader )
          throws ArchetypeDataSourceException
      {
          try
          {
              ArchetypeCatalogXpp3Reader catalogReader = new ArchetypeCatalogXpp3Reader();
  
              return catalogReader.read( reader );
          }
          catch ( IOException e )
          {
              throw new ArchetypeDataSourceException( "Error reading archetype catalog.", e );
          }
          catch ( XmlPullParserException e )
          {
              throw new ArchetypeDataSourceException( "Error parsing archetype catalog.", e );
          }
          finally
          {
              IOUtil.close( reader );
          }
      }
  }