package org.apache.maven.model.transform.pull;
   
   /*
    * 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.util.ArrayList;
  import java.util.List;
  import java.util.Objects;
  
  import org.codehaus.plexus.util.xml.pull.XmlPullParser;
  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
  
  /**
   * Buffer events while parsing a given element to allow some post-processing.
   *
   * @author Guillaume Nodet
   * @since 4.0.0
   */
  public abstract class NodeBufferingParser extends BufferingParser
  {
  
      private final List<Event> buffer = new ArrayList<>();
  
      private final String nodeName;
  
      private boolean buffering;
  
      public NodeBufferingParser( XmlPullParser xmlPullParser, String nodeName )
      {
          super( xmlPullParser );
          this.nodeName = Objects.requireNonNull( nodeName );
      }
  
      @Override
      protected boolean accept() throws XmlPullParserException, IOException
      {
          if ( nodeName.equals( xmlPullParser.getName() ) )
          {
              if ( xmlPullParser.getEventType() == START_TAG && !buffering )
              {
                  buffer.add( bufferEvent() );
                  buffering = true;
                  return false;
              }
              if ( xmlPullParser.getEventType() == END_TAG && buffering )
              {
                  buffer.add( bufferEvent() );
                  process( buffer );
                  buffering = false;
                  buffer.clear();
                  return false;
              }
          }
          else if ( buffering )
          {
              buffer.add( bufferEvent() );
              return false;
          }
          return true;
      }
  
      protected abstract void process( List<Event> buffer );
  
  }