/*
* 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.model.NodePointer;
/**
* A single-set EvalContext that provides access to the current node of
* the parent context and nothing else. It does not pass the iteration
* on to the parent context.
*
* @author Dmitri Plotnikov
* @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
*/
public class InitialContext extends EvalContext {
private boolean started = false;
private boolean collection;
private NodePointer nodePointer;
/**
* Create a new InitialContext.
* @param parentContext parent context
*/
public InitialContext(EvalContext parentContext) {
super(parentContext);
nodePointer =
(NodePointer) parentContext.getCurrentNodePointer().clone();
if (nodePointer != null) {
collection =
(nodePointer.getIndex() == NodePointer.WHOLE_COLLECTION);
}
}
public Pointer getSingleNodePointer() {
return nodePointer;
}
public NodePointer getCurrentNodePointer() {
return nodePointer;
}
public Object getValue() {
return nodePointer.getValue();
}
public boolean nextNode() {
return setPosition(position + 1);
}
public boolean setPosition(int position) {
this.position = position;
if (collection) {
if (position >= 1 && position <= nodePointer.getLength()) {
nodePointer.setIndex(position - 1);
return true;
}
return false;
}
return position == 1;
}
public boolean nextSet() {
if (started) {
return false;
}
started = true;
return true;
}
}
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