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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: FilterIterator.java,v 1.2.4.1 2005/09/06 06:21:10 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.DTMFilter;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
/**
* Similar to a CurrentNodeListIterator except that the filter has a
* simpler interface (only needs the node, no position, last, etc.)
* It takes a source iterator and a Filter object and returns nodes
* from the source after filtering them by calling filter.test(node).
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class FilterIterator extends DTMAxisIteratorBase {
/**
* Reference to source iterator.
*/
private DTMAxisIterator _source;
/**
* Reference to a filter object that to be applied to each node.
*/
private final DTMFilter _filter;
/**
* A flag indicating if position is reversed.
*/
private final boolean _isReverse;
public FilterIterator(DTMAxisIterator source, DTMFilter filter) {
_source = source;
// System.out.println("FI souce = " + source + " this = " + this);
_filter = filter;
_isReverse = source.isReverse();
}
public boolean isReverse() {
return _isReverse;
}
public void setRestartable(boolean isRestartable) {
_isRestartable = isRestartable;
_source.setRestartable(isRestartable);
}
public DTMAxisIterator cloneIterator() {
try {
final FilterIterator clone = (FilterIterator) 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 DTMAxisIterator reset() {
_source.reset();
return resetPosition();
}
public int next() {
int node;
while ((node = _source.next()) != END) {
if (_filter.acceptNode(node, DTMFilter.SHOW_ALL) == DTMIterator.FILTER_ACCEPT) {
return returnNode(node);
}
}
return END;
}
public DTMAxisIterator setStartNode(int node) {
if (_isRestartable) {
_source.setStartNode(_startNode = node);
return resetPosition();
}
return this;
}
public void setMark() {
_source.setMark();
}
public void gotoMark() {
_source.gotoMark();
}
}
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