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/*
* $Id: DupFilterIterator.java,v 1.10 2010-11-01 04:34:24 joehw 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.xalan.internal.xsltc.util.IntegerArray;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.ref.DTMAxisIteratorBase;
import com.sun.org.apache.xml.internal.dtm.ref.DTMDefaultBase;
/**
* Removes duplicates and sorts a source iterator. The nodes from the
* source are collected in an array upon calling setStartNode(). This
* array is later sorted and duplicates are ignored in next().
* @author G. Todd Miller
*/
public final class DupFilterIterator extends DTMAxisIteratorBase {
/**
* Reference to source iterator.
*/
private DTMAxisIterator _source;
/**
* Array to cache all nodes from source.
*/
private IntegerArray _nodes = new IntegerArray();
/**
* Index in _nodes array to current node.
*/
private int _current = 0;
/**
* Cardinality of _nodes array.
*/
private int _nodesSize = 0;
/**
* Last value returned by next().
*/
private int _lastNext = END;
/**
* Temporary variable to store _lastNext.
*/
private int _markedLastNext = END;
public DupFilterIterator(DTMAxisIterator source) {
_source = source;
// System.out.println("DFI source = " + source + " this = " + this);
// Cache contents of id() or key() index right away. Necessary for
// union expressions containing multiple calls to the same index, and
// correct as well since start-node is irrelevant for id()/key() exrp.
if (source instanceof KeyIndex) {
setStartNode(DTMDefaultBase.ROOTNODE);
}
}
/**
* Set the start node for this iterator
* @param node The start node
* @return A reference to this node iterator
*/
public DTMAxisIterator setStartNode(int node) {
if (_isRestartable) {
// KeyIndex iterators are always relative to the root node, so there
// is never any point in re-reading the iterator (and we SHOULD NOT).
if (_source instanceof KeyIndex
&& _startNode == DTMDefaultBase.ROOTNODE) {
return this;
}
if (node != _startNode) {
_source.setStartNode(_startNode = node);
_nodes.clear();
while ((node = _source.next()) != END) {
_nodes.add(node);
}
_nodes.sort();
_nodesSize = _nodes.cardinality();
_current = 0;
_lastNext = END;
resetPosition();
}
}
return this;
}
public int next() {
while (_current < _nodesSize) {
final int next = _nodes.at(_current++);
if (next != _lastNext) {
return returnNode(_lastNext = next);
}
}
return END;
}
public DTMAxisIterator cloneIterator() {
try {
final DupFilterIterator clone =
(DupFilterIterator) super.clone();
clone._nodes = (IntegerArray) _nodes.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 void setRestartable(boolean isRestartable) {
_isRestartable = isRestartable;
_source.setRestartable(isRestartable);
}
public void setMark() {
_markedNode = _current;
_markedLastNext = _lastNext; // Bugzilla 25924
}
public void gotoMark() {
_current = _markedNode;
_lastNext = _markedLastNext; // Bugzilla 25924
}
public DTMAxisIterator reset() {
_current = 0;
_lastNext = END;
return resetPosition();
}
}