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/*
* $Id: UnionIterator.java,v 1.11 2010-11-01 04:34:25 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.dom;
import 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;
/**
* UnionIterator takes a set of NodeIterators and produces
* a merged NodeSet in document order with duplicates removed
* The individual iterators are supposed to generate nodes
* in document order
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class UnionIterator extends MultiValuedNodeHeapIterator {
/** wrapper for NodeIterators to support iterator
comparison on the value of their next() method
*/
final private DOM _dom;
private final class LookAheadIterator
extends MultiValuedNodeHeapIterator.HeapNode
{
public DTMAxisIterator iterator;
public LookAheadIterator(DTMAxisIterator iterator) {
super();
this.iterator = iterator;
}
public int step() {
_node = iterator.next();
return _node;
}
public HeapNode cloneHeapNode() {
LookAheadIterator clone = (LookAheadIterator) super.cloneHeapNode();
clone.iterator = iterator.cloneIterator();
return clone;
}
public void setMark() {
super.setMark();
iterator.setMark();
}
public void gotoMark() {
super.gotoMark();
iterator.gotoMark();
}
public boolean isLessThan(HeapNode heapNode) {
LookAheadIterator comparand = (LookAheadIterator) heapNode;
return _dom.lessThan(_node, heapNode._node);
}
public HeapNode setStartNode(int node) {
iterator.setStartNode(node);
return this;
}
public HeapNode reset() {
iterator.reset();
return this;
}
} // end of LookAheadIterator
public UnionIterator(DOM dom) {
_dom = dom;
}
public UnionIterator addIterator(DTMAxisIterator iterator) {
addHeapNode(new LookAheadIterator(iterator));
return this;
}
}