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SortingIterator.javaAPI DocJava SE 5 API3900Fri Aug 26 14:55:40 BST 2005com.sun.org.apache.xalan.internal.xsltc.dom

SortingIterator

public final class SortingIterator extends DTMAxisIteratorBase
author
Jacek Ambroziak
author
Santiago Pericas-Geertsen
author
Morten Jorgensen

Fields Summary
private static final int
INIT_DATA_SIZE
private DTMAxisIterator
_source
private NodeSortRecordFactory
_factory
private NodeSortRecord[]
_data
private int
_free
private int
_current
Constructors Summary
public SortingIterator(DTMAxisIterator source, NodeSortRecordFactory factory)

	// index in _nodes of the next node to try

       
			     
	_source = source;
	_factory = factory;
    
Methods Summary
private voidaddRecord(com.sun.org.apache.xalan.internal.xsltc.dom.NodeSortRecord record)

	if (_free == _data.length) {
	    NodeSortRecord[] newArray = new NodeSortRecord[_data.length * 2];
	    System.arraycopy(_data, 0, newArray, 0, _free);
	    _data = newArray;
	}
	_data[_free++] = record;
    
public com.sun.org.apache.xml.internal.dtm.DTMAxisIteratorcloneIterator()
Clone a SortingIterator by cloning its source iterator and then sharing the factory and the array of NodeSortRecords.

	try {
	    final SortingIterator clone = (SortingIterator) super.clone();
	    clone._source = _source.cloneIterator();  
	    clone._factory = _factory;		// shared between clones
	    clone._data = _data;		// shared between clones
	    clone._free = _free;
	    clone._current = _current;
	    clone.setRestartable(false);
	    return clone.reset();
	}
	catch (CloneNotSupportedException e) {
	    BasisLibrary.runTimeError(BasisLibrary.ITERATOR_CLONE_ERR,
				      e.toString());
	    return null;
	}
    
public intgetLast()

	return _free;
    
public intgetPosition()

	return _current == 0 ? 1 : _current;
    
public voidgotoMark()

	_source.gotoMark();
	_current = _markedNode;
    
public intnext()

	return _current < _free ? _data[_current++].getNode() : END;
    
private intpartition(int p, int r)

	final NodeSortRecord x = _data[(p + r) >>> 1];
	int i = p - 1;
	int j = r + 1;
	while (true) {
	    while (x.compareTo(_data[--j]) < 0);
	    while (x.compareTo(_data[++i]) > 0);
	    if (i < j) {
		final NodeSortRecord t = _data[i];
		_data[i] = _data[j];
		_data[j] = t;
	    }
	    else {
		return(j);
	    }
	}
    
private voidquicksort(int p, int r)

	while (p < r) {
	    final int q = partition(p, r);
	    quicksort(p, q);
	    p = q + 1;
	}
    
public voidsetMark()

	_source.setMark();
	_markedNode = _current;
    
public com.sun.org.apache.xml.internal.dtm.DTMAxisIteratorsetStartNode(int node)

	try {
	    _source.setStartNode(_startNode = node);
	    _data = new NodeSortRecord[INIT_DATA_SIZE];
	    _free = 0;

	    // gather all nodes from the source iterator
	    while ((node = _source.next()) != END) {
		addRecord(_factory.makeNodeSortRecord(node,_free));
	    }
	    // now sort the records
	    quicksort(0, _free - 1);

	    _current = 0;
	    return this;
	}
	catch (Exception e) {
	    return this;
	}