RelativePath


1   /*
2    * Copyright 1999,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */ 
16  
17  package org.apache.taglibs.standard.extra.spath;
18  
19  import java.util.List  ;
20  import java.util.Vector  ;
21  
22  /**
23   * <p>Represents a relative SPath expression.</p>
24   *
25   * @author Shawn Bayern
26   */
27  public class RelativePath extends Path {
28  
29      private RelativePath next;
30      private Step step;
31  
32      /**
33       * Constructs a new RelativePath object, based on a Step and another
34       * (possibly null) RelativePath.  If 'all' is true, then the path
35       * matches all instances of 'next' underneath 'step'; otherwise;
36       * 'next' must be an immediate child of 'step'.
37       */
38      public RelativePath(Step step, RelativePath next) {
39      if (step == null)
40          throw new IllegalArgumentException  ("non-null step required");
41      this.step = step;
42      this.next = next;
43      }
44  
45      // inherit JavaDoc comment
46      public List   getSteps() {
47      // simply merge our 'step' with our 'next'
48      List   l;
49      if (next != null)
50          l = next.getSteps();
51      else
52          l = new Vector  ();
53      l.add(0, step);
54      return l;
55      }
56  }
57

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