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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 13:46:46 -0400 (Fri, 02 May 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  }