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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.maven.model.transform.pull;
20  
21  import java.io.IOException;
22  import java.util.ArrayList;
23  import java.util.List;
24  import java.util.Objects;
25  
26  import org.codehaus.plexus.util.xml.pull.XmlPullParser;
27  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
28  
29  /**
30   * Buffer events while parsing a given element to allow some post-processing.
31   *
32   * @author Guillaume Nodet
33   * @since 4.0.0
34   */
35  public abstract class NodeBufferingParser extends BufferingParser {
36  
37      private final List<Event> buffer = new ArrayList<>();
38  
39      private final String nodeName;
40  
41      private boolean buffering;
42  
43      public NodeBufferingParser(XmlPullParser xmlPullParser, String nodeName) {
44          super(xmlPullParser);
45          this.nodeName = Objects.requireNonNull(nodeName);
46      }
47  
48      @Override
49      protected boolean accept() throws XmlPullParserException, IOException {
50          if (nodeName.equals(xmlPullParser.getName())) {
51              if (xmlPullParser.getEventType() == START_TAG && !buffering) {
52                  buffer.add(bufferEvent());
53                  buffering = true;
54                  return false;
55              }
56              if (xmlPullParser.getEventType() == END_TAG && buffering) {
57                  buffer.add(bufferEvent());
58                  process(buffer);
59                  buffering = false;
60                  buffer.clear();
61                  return false;
62              }
63          } else if (buffering) {
64              buffer.add(bufferEvent());
65              return false;
66          }
67          return true;
68      }
69  
70      protected abstract void process(List<Event> buffer);
71  }