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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   * Intermediate evaluation state of a <code>.../name...</code> XPath
21   * expression. Matches nothing, but specifies the evaluation state
22   * for the child elements with the given name.
23   */
24  public class NamedElementMatcher extends ChildMatcher {
25  
26      private final String namespace;
27  
28      private final String name;
29  
30      protected NamedElementMatcher(String namespace, String name, Matcher then) {
31          super(then);
32          this.namespace = namespace;
33          this.name = name;
34      }
35  
36      public Matcher descend(String namespace, String name) {
37          if (equals(namespace, this.namespace) && name.equals(this.name)) {
38              return super.descend(namespace, name);
39          } else {
40              return FAIL;
41          }
42      }
43  
44      private static boolean equals(String a, String b) {
45          return (a == null) ? (b == null) : a.equals(b);
46      }
47  
48  }