View Javadoc

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  package org.apache.commons.jxpath.ri.axes;
17  
18  import org.apache.commons.jxpath.NodeSet;
19  import org.apache.commons.jxpath.ri.EvalContext;
20  import org.apache.commons.jxpath.ri.model.NodePointer;
21  
22  /***
23   * A simple context that is based on a NodeSet.
24   *
25   * @author Dmitri Plotnikov
26   * @version $Revision: 1.3 $ $Date: 2004/02/29 14:17:37 $
27   */
28  public class NodeSetContext extends EvalContext {
29      private boolean startedSet = false;
30      private NodeSet nodeSet;
31  
32      public NodeSetContext(EvalContext parentContext, NodeSet nodeSet) {
33          super(parentContext);
34          this.nodeSet = nodeSet;
35      }
36      
37      public NodeSet getNodeSet() {
38          return nodeSet;
39      }
40  
41      public NodePointer getCurrentNodePointer() {
42          if (position == 0) {
43              if (!setPosition(1)) {
44                  return null;
45              }
46          }
47          return (NodePointer) nodeSet.getPointers().get(position - 1);
48      }
49  
50      public boolean setPosition(int position) {
51          super.setPosition(position);
52          return position >= 1 && position <= nodeSet.getPointers().size();
53      }
54  
55      public boolean nextSet() {
56          if (startedSet) {
57              return false;
58          }
59          startedSet = true;
60          return true;
61      }
62  
63      public boolean nextNode() {
64          return setPosition(position + 1);
65      }
66  }