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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  import org.codehaus.plexus.util.xml.pull.XmlPullParser;
26  import org.codehaus.plexus.util.xml.pull.XmlPullParserException;
27  
28  /**
29   * Buffer events while parsing a given element to allow some post-processing.
30   *
31   * @author Guillaume Nodet
32   * @since 4.0.0
33   */
34  public abstract class NodeBufferingParser extends BufferingParser {
35  
36      private final List<Event> buffer = new ArrayList<>();
37  
38      private final String nodeName;
39  
40      private boolean buffering;
41  
42      public NodeBufferingParser(XmlPullParser xmlPullParser, String nodeName) {
43          super(xmlPullParser);
44          this.nodeName = Objects.requireNonNull(nodeName);
45      }
46  
47      @Override
48      protected boolean accept() throws XmlPullParserException, IOException {
49          if (nodeName.equals(xmlPullParser.getName())) {
50              if (xmlPullParser.getEventType() == START_TAG && !buffering) {
51                  buffer.add(bufferEvent());
52                  buffering = true;
53                  return false;
54              }
55              if (xmlPullParser.getEventType() == END_TAG && buffering) {
56                  buffer.add(bufferEvent());
57                  process(buffer);
58                  buffering = false;
59                  buffer.clear();
60                  return false;
61              }
62          } else if (buffering) {
63              buffer.add(bufferEvent());
64              return false;
65          }
66          return true;
67      }
68  
69      protected abstract void process(List<Event> buffer);
70  }