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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.tika.sax.xpath;
18  
19  /**
20   * Evaluation state of a <code>...//...</code> XPath expression. Applies the
21   * contained evaluation state to the current element and all its descendants.
22   */
23  public class SubtreeMatcher extends Matcher {
24  
25      private final Matcher then;
26  
27      public SubtreeMatcher(Matcher then) {
28          this.then = then;
29      }
30  
31      @Override
32      public Matcher descend(String namespace, String name) {
33          Matcher next = then.descend(namespace, name);
34          if (next == FAIL || next == then) {
35              return this;
36          } else {
37              return new CompositeMatcher(next, this);
38          }
39      }
40  
41      @Override
42      public boolean matchesElement() {
43          return then.matchesElement();
44      }
45  
46      @Override
47      public boolean matchesAttribute(String namespace, String name) {
48          return then.matchesAttribute(namespace, name);
49      }
50  
51      @Override
52      public boolean matchesText() {
53          return then.matchesText();
54      }
55  
56  }