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
18 package org.apache.commons.jxpath.ri.axes;
19
20 import org.apache.commons.jxpath.NodeSet;
21 import org.apache.commons.jxpath.ri.EvalContext;
22 import org.apache.commons.jxpath.ri.model.NodePointer;
23
24 /**
25 * A simple context that is based on a {@link NodeSet}.
26 */
27 public class NodeSetContext extends EvalContext {
28
29 private boolean startedSet;
30 private final NodeSet nodeSet;
31
32 /**
33 * Constructs a new NodeSetContext.
34 *
35 * @param parentContext parent context
36 * @param nodeSet associated NodeSet
37 */
38 public NodeSetContext(final EvalContext parentContext, final NodeSet nodeSet) {
39 super(parentContext);
40 this.nodeSet = nodeSet;
41 }
42
43 @Override
44 public NodePointer getCurrentNodePointer() {
45 if (position == 0 && !setPosition(1)) {
46 return null;
47 }
48 return (NodePointer) nodeSet.getPointers().get(position - 1);
49 }
50
51 @Override
52 public NodeSet getNodeSet() {
53 return nodeSet;
54 }
55
56 @Override
57 public boolean nextNode() {
58 return setPosition(position + 1);
59 }
60
61 @Override
62 public boolean nextSet() {
63 if (startedSet) {
64 return false;
65 }
66 startedSet = true;
67 return true;
68 }
69
70 @Override
71 public boolean setPosition(final int position) {
72 super.setPosition(position);
73 return position >= 1 && position <= nodeSet.getPointers().size();
74 }
75 }