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.ri.EvalContext;
20 import org.apache.commons.jxpath.ri.compiler.NodeTest;
21 import org.apache.commons.jxpath.ri.model.NodePointer;
22
23 /**
24 * EvalContext that walks the "parent::" axis.
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 ParentContext extends EvalContext {
30 private NodeTest nodeTest;
31 private boolean setStarted = false;
32 private NodePointer currentNodePointer;
33
34 /**
35 * Create a new ParentContext.
36 * @param parentContext parent context
37 * @param nodeTest test
38 */
39 public ParentContext(EvalContext parentContext, NodeTest nodeTest) {
40 super(parentContext);
41 this.nodeTest = nodeTest;
42 }
43
44 public NodePointer getCurrentNodePointer() {
45 return currentNodePointer;
46 }
47
48 public int getCurrentPosition() {
49 return 1;
50 }
51
52 public int getDocumentOrder() {
53 return -1;
54 }
55
56 public void reset() {
57 super.reset();
58 setStarted = false;
59 }
60
61 public boolean setPosition(int position) {
62 super.setPosition(position);
63 return position == 1;
64 }
65
66 public boolean nextNode() {
67 // Each set contains exactly one node: the parent
68 if (setStarted) {
69 return false;
70 }
71 setStarted = true;
72 NodePointer thisLocation = parentContext.getCurrentNodePointer();
73 currentNodePointer = thisLocation.getImmediateParentPointer();
74 while (currentNodePointer != null
75 && currentNodePointer.isContainer()) {
76 currentNodePointer = currentNodePointer.getImmediateParentPointer();
77 }
78 if (currentNodePointer != null
79 && currentNodePointer.testNode(nodeTest)) {
80 position++;
81 return true;
82 }
83 return false;
84 }
85 }