/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.jxpath.ri.axes;
import org.apache.commons.jxpath.Pointer;
import org.apache.commons.jxpath.ri.EvalContext;
import org.apache.commons.jxpath.ri.compiler.NodeTest;
import org.apache.commons.jxpath.ri.model.NodePointer;
/**
* EvalContext that returns the current node from the parent context if the
* test succeeds.
*
* @author Dmitri Plotnikov
* @version $Revision: 670727 $ $Date: 2008-06-23 15:10:38 -0500 (Mon, 23 Jun 2008) $
*/
public class SelfContext extends EvalContext {
private NodeTest nodeTest;
private boolean startedSet = false;
private NodePointer nodePointer;
/**
* Create a new SelfContext.
* @param parentContext EvalContext
* @param nodeTest guard
*/
public SelfContext(EvalContext parentContext, NodeTest nodeTest) {
super(parentContext);
this.nodeTest = nodeTest;
}
public Pointer getSingleNodePointer() {
return parentContext.getSingleNodePointer();
}
public NodePointer getCurrentNodePointer() {
if (position == 0 && !setPosition(1)) {
return null;
}
return nodePointer;
}
public boolean nextNode() {
return setPosition(getCurrentPosition() + 1);
}
public void reset() {
super.reset();
startedSet = false;
}
public boolean setPosition(int position) {
if (position != 1) {
return false;
}
super.setPosition(position);
if (!startedSet) {
startedSet = true;
nodePointer = (NodePointer) parentContext.getCurrentNodePointer();
}
if (nodePointer == null) {
return false;
}
return nodeTest == null || nodePointer.testNode(nodeTest);
}
}
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