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.commons.jxpath.ri.axes;
18
19 import org.apache.commons.jxpath.NodeSet;
20 import org.apache.commons.jxpath.ri.EvalContext;
21 import org.apache.commons.jxpath.ri.model.NodePointer;
22
23 /**
24 * A simple context that is based on a {@link NodeSet}.
25 *
26 * @author Dmitri Plotnikov
27 * @version $Revision: 652845 $ $Date: 2008-05-02 19:46:46 +0200 (Fr, 02 Mai 2008) $
28 */
29 public class NodeSetContext extends EvalContext {
30 private boolean startedSet = false;
31 private NodeSet nodeSet;
32
33 /**
34 * Create a new NodeSetContext.
35 * @param parentContext parent context
36 * @param nodeSet associated NodeSet
37 */
38 public NodeSetContext(EvalContext parentContext, NodeSet nodeSet) {
39 super(parentContext);
40 this.nodeSet = nodeSet;
41 }
42
43 public NodeSet getNodeSet() {
44 return nodeSet;
45 }
46
47 public NodePointer getCurrentNodePointer() {
48 if (position == 0 && !setPosition(1)) {
49 return null;
50 }
51 return (NodePointer) nodeSet.getPointers().get(position - 1);
52 }
53
54 public boolean setPosition(int position) {
55 super.setPosition(position);
56 return position >= 1 && position <= nodeSet.getPointers().size();
57 }
58
59 public boolean nextSet() {
60 if (startedSet) {
61 return false;
62 }
63 startedSet = true;
64 return true;
65 }
66
67 public boolean nextNode() {
68 return setPosition(position + 1);
69 }
70 }