package org.apache.maven.plugins.antrun;
   
   /*
    * 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.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.util.xml.Xpp3DomUtils;
  import org.codehaus.plexus.util.xml.pull.MXSerializer;
  import org.codehaus.plexus.util.xml.pull.XmlSerializer;
  
  import java.io.BufferedOutputStream;
  import java.io.File;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.HashSet;
  import java.util.Set;
  
  /**
   * Write the Ant target Plexus configuration to an XML file.
   */
  class AntrunXmlPlexusConfigurationWriter
  {
  
      private static final Set<String> EXCLUDED_ATTRIBUTES =
          new HashSet<>( Arrays.asList( Xpp3DomUtils.CHILDREN_COMBINATION_MODE_ATTRIBUTE,
                                              Xpp3DomUtils.SELF_COMBINATION_MODE_ATTRIBUTE ) );
  
      /**
       * @param configuration {@link PlexusConfiguration}
       * @param file File to write the Plexus configuration to.
       * @param customTaskPrefix Prefix to use for the custom Ant tasks. Empty if no prefix should be used.
       * @param antTargetName Name of the default Ant target.
       * @throws IOException In case of problems.
       */
      public void write( PlexusConfiguration configuration, File file, String customTaskPrefix, String antTargetName )
          throws IOException
      {
          MXSerializer serializer = new MXSerializer();
          serializer.setProperty( "http://xmlpull.org/v1/doc/properties.html#serializer-line-separator",
                                  System.getProperty( "line.separator" ) );
          serializer.setProperty( "http://xmlpull.org/v1/doc/properties.html#serializer-indentation", "  " );
          try ( BufferedOutputStream bos = new BufferedOutputStream( new FileOutputStream( file ) ) )
          {
              serializer.setOutput( bos, AntRunMojo.UTF_8 );
              serializer.startDocument( AntRunMojo.UTF_8, null );
              if ( !customTaskPrefix.isEmpty() )
              {
                  serializer.setPrefix( customTaskPrefix, AntRunMojo.TASK_URI );
              }
              serializer.startTag( null, "project" );
              serializer.attribute( null, "name", "maven-antrun-" );
              serializer.attribute( null, "default", antTargetName );
              write( configuration, serializer );
              serializer.endTag( null, "project" );
              serializer.endDocument();
          }
      }
  
      private void write( PlexusConfiguration c, XmlSerializer serializer )
          throws IOException
      {
          serializer.startTag( null, c.getName() );
          writeAttributes( c, serializer );
  
          int count = c.getChildCount();
          if ( count == 0 )
          {
              String value = c.getValue();
              if ( value != null )
              {
                  serializer.text( value );
              }
          }
          else
          {
              for ( int i = 0; i < count; i++ )
              {
                  PlexusConfiguration child = c.getChild( i );
                  write( child, serializer );
              }
          }
  
         serializer.endTag( null, c.getName() );
     }
 
     private void writeAttributes( PlexusConfiguration c, XmlSerializer serializer )
         throws IOException
     {
         String[] names = c.getAttributeNames();
 
         for ( String name : names )
         {
             if ( !EXCLUDED_ATTRIBUTES.contains( name ) )
             {
                 serializer.attribute( null, name, c.getAttribute( name ) );
             }
         }
     }
 
 }