KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > commons > jxpath > ri > axes > NodeSetContext


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 }
Popular Tags