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The XPath engine used by HtmlUnit.
/*
* 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.htmlunit.xpath.axes;
import org.htmlunit.xpath.Expression;
import org.htmlunit.xpath.compiler.Compiler;
import org.htmlunit.xpath.compiler.OpMap;
import org.htmlunit.xpath.xml.dtm.DTM;
/**
* This class implements a general iterator for those LocationSteps with only one step, and perhaps
* a predicate, that only go forward (i.e. it can not be used with ancestors, preceding, etc.)
*/
public class OneStepIteratorForward extends ChildTestIterator {
/** The traversal axis from where the nodes will be filtered. */
protected int m_axis;
/**
* Create a OneStepIterator object.
*
* @param compiler A reference to the Compiler that contains the op map.
* @param opPos The position within the op map, which contains the location path expression for
* this itterator.
* @throws javax.xml.transform.TransformerException if any
*/
OneStepIteratorForward(final Compiler compiler, final int opPos, final int analysis)
throws javax.xml.transform.TransformerException {
super(compiler, opPos, analysis);
final int firstStepPos = OpMap.getFirstChildPos(opPos);
m_axis = WalkerFactory.getAxisFromStep(compiler, firstStepPos);
}
/** {@inheritDoc} */
@Override
public void setRoot(final int context, final Object environment) {
super.setRoot(context, environment);
m_traverser = m_cdtm.getAxisTraverser(m_axis);
}
/** {@inheritDoc} */
@Override
protected int getNextNode() {
m_lastFetched =
(DTM.NULL == m_lastFetched)
? m_traverser.first(m_context)
: m_traverser.next(m_context, m_lastFetched);
return m_lastFetched;
}
/** {@inheritDoc} */
@Override
public int getAxis() {
return m_axis;
}
/** {@inheritDoc} */
@Override
public boolean deepEquals(final Expression expr) {
if (!super.deepEquals(expr)) {
return false;
}
return m_axis == ((OneStepIteratorForward) expr).m_axis;
}
}
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