001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jxpath.ri.axes;
018
019 import org.apache.commons.jxpath.NodeSet;
020 import org.apache.commons.jxpath.ri.EvalContext;
021 import org.apache.commons.jxpath.ri.model.NodePointer;
022
023 /**
024 * A simple context that is based on a {@link NodeSet}.
025 *
026 * @author Dmitri Plotnikov
027 * @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
028 */
029 public class NodeSetContext extends EvalContext {
030 private boolean startedSet = false;
031 private NodeSet nodeSet;
032
033 /**
034 * Create a new NodeSetContext.
035 * @param parentContext parent context
036 * @param nodeSet associated NodeSet
037 */
038 public NodeSetContext(EvalContext parentContext, NodeSet nodeSet) {
039 super(parentContext);
040 this.nodeSet = nodeSet;
041 }
042
043 public NodeSet getNodeSet() {
044 return nodeSet;
045 }
046
047 public NodePointer getCurrentNodePointer() {
048 if (position == 0 && !setPosition(1)) {
049 return null;
050 }
051 return (NodePointer) nodeSet.getPointers().get(position - 1);
052 }
053
054 public boolean setPosition(int position) {
055 super.setPosition(position);
056 return position >= 1 && position <= nodeSet.getPointers().size();
057 }
058
059 public boolean nextSet() {
060 if (startedSet) {
061 return false;
062 }
063 startedSet = true;
064 return true;
065 }
066
067 public boolean nextNode() {
068 return setPosition(position + 1);
069 }
070 }