/*
* 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.ri.Compiler;
import org.apache.commons.jxpath.ri.EvalContext;
import org.apache.commons.jxpath.ri.QName;
import org.apache.commons.jxpath.ri.compiler.NodeNameTest;
import org.apache.commons.jxpath.ri.compiler.NodeTest;
import org.apache.commons.jxpath.ri.compiler.NodeTypeTest;
import org.apache.commons.jxpath.ri.model.NodeIterator;
import org.apache.commons.jxpath.ri.model.NodePointer;
/**
* EvalContext that walks the "attribute::" axis.
*
* @author Dmitri Plotnikov
* @version $Revision: 652845 $ $Date: 2008-05-02 12:46:46 -0500 (Fri, 02 May 2008) $
*/
public class AttributeContext extends EvalContext {
private static final QName WILDCARD = new QName(null, "*");
private NodeTest nodeTest;
private boolean setStarted = false;
private NodeIterator iterator;
private NodePointer currentNodePointer;
/**
* Create a new AttributeContext.
* @param parentContext represents the previous step on the path
* @param nodeTest is the name of the attribute we are looking for
*/
public AttributeContext(EvalContext parentContext, NodeTest nodeTest) {
super(parentContext);
this.nodeTest = nodeTest;
}
public NodePointer getCurrentNodePointer() {
return currentNodePointer;
}
public void reset() {
setStarted = false;
iterator = null;
super.reset();
}
public boolean setPosition(int position) {
if (position < getCurrentPosition()) {
reset();
}
while (getCurrentPosition() < position) {
if (!nextNode()) {
return false;
}
}
return true;
}
public boolean nextNode() {
super.setPosition(getCurrentPosition() + 1);
if (!setStarted) {
setStarted = true;
QName name;
if (nodeTest instanceof NodeNameTest) {
name = ((NodeNameTest) nodeTest).getNodeName();
}
else {
if (nodeTest instanceof NodeTypeTest
&& ((NodeTypeTest) nodeTest).getNodeType() == Compiler.NODE_TYPE_NODE) {
name = WILDCARD;
}
else {
iterator = null;
return false;
}
}
iterator = parentContext.getCurrentNodePointer().attributeIterator(
name);
}
if (iterator == null) {
return false;
}
if (!iterator.setPosition(iterator.getPosition() + 1)) {
return false;
}
currentNodePointer = iterator.getNodePointer();
return true;
}
}
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