package org.apache.maven.internal.xml;
   
   /*
    * 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.IOException;
  import java.io.InputStream;
  import java.io.Reader;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.maven.api.xml.Dom;
  import org.codehaus.plexus.util.IOUtil;
  import org.codehaus.plexus.util.xml.pull.MXParser;
  import org.codehaus.plexus.util.xml.pull.XmlPullParser;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  /**
   *
   */
  public class Xpp3DomBuilder
  {
      private static final boolean DEFAULT_TRIM = true;
  
      public static Xpp3Dom build( Reader reader )
          throws XmlPullParserException, IOException
      {
          return build( reader, null );
      }
  
      /**
       * @param reader the reader
       * @param locationBuilder the builder
       * @since 3.2.0
       * @return DOM
       * @throws XmlPullParserException xml exception
       * @throws IOException io
       */
      public static Xpp3Dom build( Reader reader, InputLocationBuilder locationBuilder )
          throws XmlPullParserException, IOException
      {
          return build( reader, DEFAULT_TRIM, locationBuilder );
      }
  
      public static Xpp3Dom build( InputStream is, String encoding )
          throws XmlPullParserException, IOException
      {
          return build( is, encoding, DEFAULT_TRIM );
      }
  
      public static Xpp3Dom build( InputStream is, String encoding, boolean trim )
          throws XmlPullParserException, IOException
      {
          try
          {
              final XmlPullParser parser = new MXParser();
              parser.setInput( is, encoding );
  
              final Xpp3Dom xpp3Dom = build( parser, trim );
              is.close();
              is = null;
  
              return xpp3Dom;
          }
          finally
          {
              IOUtil.close( is );
          }
      }
  
      public static Xpp3Dom build( Reader reader, boolean trim )
          throws XmlPullParserException, IOException
      {
          return build( reader, trim, null );
      }
  
      /**
       * @param reader the reader
       * @param trim to trim
       * @param locationBuilder the builder
       * @since 3.2.0
      * @return DOM
      * @throws XmlPullParserException xml exception
      * @throws IOException io
      */
     public static Xpp3Dom build( Reader reader, boolean trim, InputLocationBuilder locationBuilder )
         throws XmlPullParserException, IOException
     {
         try
         {
             final XmlPullParser parser = new MXParser();
             parser.setInput( reader );
 
             final Xpp3Dom xpp3Dom = build( parser, trim, locationBuilder );
             reader.close();
             reader = null;
 
             return xpp3Dom;
         }
         finally
         {
             IOUtil.close( reader );
         }
     }
 
     public static Xpp3Dom build( XmlPullParser parser )
         throws XmlPullParserException, IOException
     {
         return build( parser, DEFAULT_TRIM );
     }
 
     public static Xpp3Dom build( XmlPullParser parser, boolean trim )
         throws XmlPullParserException, IOException
     {
         return build( parser, trim, null );
     }
 
     /**
      * @since 3.2.0
      * @param locationBuilder builder
      * @param parser the parser
      * @param trim do trim
      * @return DOM
      * @throws XmlPullParserException xml exception
      * @throws IOException io
      */
     public static Xpp3Dom build( XmlPullParser parser, boolean trim, InputLocationBuilder locationBuilder )
         throws XmlPullParserException, IOException
     {
         boolean spacePreserve = false;
         String name = null;
         String value = null;
         Object location = null;
         Map<String, String> attrs = null;
         List<Dom> children = null;
         int eventType = parser.getEventType();
         while ( eventType != XmlPullParser.END_DOCUMENT )
         {
             if ( eventType == XmlPullParser.START_TAG )
             {
                 if ( name == null )
                 {
                     name = parser.getName();
                     location = locationBuilder != null ? locationBuilder.toInputLocation( parser ) : null;
                     int attributesSize = parser.getAttributeCount();
                     if ( attributesSize > 0 )
                     {
                         attrs = new HashMap<>();
                         for ( int i = 0; i < attributesSize; i++ )
                         {
                             String aname = parser.getAttributeName( i );
                             String avalue = parser.getAttributeValue( i );
                             attrs.put( aname, avalue );
                             spacePreserve =
                                     spacePreserve || ( "xml:space".equals( aname ) && "preserve".equals( avalue ) );
                         }
                     }
                 }
                 else
                 {
                     if ( children == null )
                     {
                         children = new ArrayList<>();
                     }
                     Dom child = build( parser, trim, locationBuilder );
                     children.add( child );
                 }
             }
             else if ( eventType == XmlPullParser.TEXT )
             {
                 String text = parser.getText();
                 if ( trim && !spacePreserve )
                 {
                     text = text.trim();
                 }
                 value = value != null ? value + text : text;
             }
             else if ( eventType == XmlPullParser.END_TAG )
             {
                 return new Xpp3Dom( name, children == null ? value : null,
                         attrs, children, location );
             }
             eventType = parser.next();
         }
         throw new IllegalStateException( "End of document found before returning to 0 depth" );
     }
 
     /**
      * Input location builder interface, to be implemented to choose how to store data.
      *
      * @since 3.2.0
      */
     public interface InputLocationBuilder
     {
         Object toInputLocation( XmlPullParser parser );
     }
 }