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/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed 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.
*/
/*
* $Id: ForwardPositionIterator.java,v 1.2.4.1 2005/09/06 06:22:05 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.dom;
import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
/**
* This iterator is a wrapper that always returns the position of
* a node in document order. It is needed for the case where
* a call to position() occurs in the context of an XSLT element
* such as xsl:for-each, xsl:apply-templates, etc.
*
* The getPosition() methods in DTMAxisIterators defined
* in DTMDefaultBaseIterators always return the position
* in document order, which is backwards for XPath in the
* case of the ancestor, ancestor-or-self, previous and
* previous-sibling.
*
* XSLTC implements position() with the
* BasisLibrary.positionF() method, and uses the
* DTMAxisIterator.isReverse() method to determine
* whether the result of getPosition() should be
* interpreted as being equal to position().
* But when the expression appears in apply-templates of
* for-each, the position() function operates in document
* order.
*
* The only effect of the ForwardPositionIterator is to force
* the result of isReverse() to false, so that
* BasisLibrary.positionF() calculates position() in a way
* that's consistent with the context in which the
* iterator is being used."
*
* (Apparently the correction of isReverse() occurs
* implicitly, by inheritance. This class also appears
* to maintain its own position counter, which seems
* redundant.)
*
* @deprecated This class exists only for backwards compatibility with old
* translets. New code should not reference it.
*/
public final class ForwardPositionIterator extends DTMAxisIteratorBase {
private DTMAxisIterator _source;
public ForwardPositionIterator(DTMAxisIterator source) {
_source = source;
}
public DTMAxisIterator cloneIterator() {
try {
final ForwardPositionIterator clone =
(ForwardPositionIterator) super.clone();
clone._source = _source.cloneIterator();
clone._isRestartable = false;
return clone.reset();
}
catch (CloneNotSupportedException e) {
BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
e.toString());
return null;
}
}
public int next() {
return returnNode(_source.next());
}
public DTMAxisIterator setStartNode(int node) {
_source.setStartNode(node);
return this;
}
public DTMAxisIterator reset() {
_source.reset();
return resetPosition();
}
public void setMark() {
_source.setMark();
}
public void gotoMark() {
_source.gotoMark();
}
}
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