/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xalan.transformer;
import java.util.Hashtable;
import java.util.Vector;
import javax.xml.transform.TransformerException;
import org.apache.xalan.templates.ElemNumber;
import org.apache.xml.dtm.DTM;
import org.apache.xpath.NodeSetDTM;
import org.apache.xpath.XPathContext;
/**
* <meta name="usage" content="internal"/>
* This is a table of counters, keyed by ElemNumber objects, each
* of which has a list of Counter objects. This really isn't a true
* table, it is more like a list of lists (there must be a technical
* term for that...).
*/
public class CountersTable extends Hashtable
{
/**
* Construct a CountersTable.
*/
public CountersTable(){}
/**
* Get the list of counters that corresponds to
* the given ElemNumber object.
*
* @param numberElem the given xsl:number element.
*
* @return the list of counters that corresponds to
* the given ElemNumber object.
*/
Vector getCounters(ElemNumber numberElem)
{
Vector counters = (Vector) this.get(numberElem);
return (null == counters) ? putElemNumber(numberElem) : counters;
}
/**
* Put a counter into the table and create an empty
* vector as it's value.
*
* @param numberElem the given xsl:number element.
*
* @return an empty vector to be used to store counts
* for this number element.
*/
Vector putElemNumber(ElemNumber numberElem)
{
Vector counters = new Vector();
this.put(numberElem, counters);
return counters;
}
/**
* Place to collect new counters.
*/
transient private NodeSetDTM m_newFound;
/**
* Add a list of counted nodes that were built in backwards document
* order, or a list of counted nodes that are in forwards document
* order.
*
* @param flist Vector of nodes built in forwards document order
* @param blist Vector of nodes built in backwards document order
*/
void appendBtoFList(NodeSetDTM flist, NodeSetDTM blist)
{
int n = blist.size();
for (int i = (n - 1); i >= 0; i--)
{
flist.addElement(blist.item(i));
}
}
// For diagnostics
/** Number of counters created so far */
transient int m_countersMade = 0;
/**
* Count forward until the given node is found, or until
* we have looked to the given amount.
*
* @param support The XPath context to use
* @param numberElem The given xsl:number element.
* @param node The node to count.
*
* @return The node count, or 0 if not found.
*
* @throws TransformerException
*/
public int countNode(XPathContext support, ElemNumber numberElem, int node)
throws TransformerException
{
int count = 0;
Vector counters = getCounters(numberElem);
int nCounters = counters.size();
// XPath countMatchPattern = numberElem.getCountMatchPattern(support, node);
// XPath fromMatchPattern = numberElem.m_fromMatchPattern;
int target = numberElem.getTargetNode(support, node);
if (DTM.NULL != target)
{
for (int i = 0; i < nCounters; i++)
{
Counter counter = (Counter) counters.elementAt(i);
count = counter.getPreviouslyCounted(support, target);
if (count > 0)
return count;
}
// In the loop below, we collect the nodes in backwards doc order, so
// we don't have to do inserts, but then we store the nodes in forwards
// document order, so we don't have to insert nodes into that list,
// so that's what the appendBtoFList stuff is all about. In cases
// of forward counting by one, this will mean a single node copy from
// the backwards list (m_newFound) to the forwards list (counter.m_countNodes).
count = 0;
if (m_newFound == null)
m_newFound = new NodeSetDTM(support.getDTMManager());
for (; DTM.NULL != target;
target = numberElem.getPreviousNode(support, target))
{
// First time in, we should not have to check for previous counts,
// since the original target node was already checked in the
// block above.
if (0 != count)
{
for (int i = 0; i < nCounters; i++)
{
Counter counter = (Counter) counters.elementAt(i);
int cacheLen = counter.m_countNodes.size();
if ((cacheLen > 0)
&& (counter.m_countNodes.elementAt(cacheLen
- 1) == target))
{
count += (cacheLen + counter.m_countNodesStartCount);
if (cacheLen > 0)
appendBtoFList(counter.m_countNodes, m_newFound);
m_newFound.removeAllElements();
return count;
}
}
}
m_newFound.addElement(target);
count++;
}
// If we got to this point, then we didn't find a counter, so make
// one and add it to the list.
Counter counter = new Counter(numberElem, new NodeSetDTM(support.getDTMManager()));
m_countersMade++; // for diagnostics
appendBtoFList(counter.m_countNodes, m_newFound);
m_newFound.removeAllElements();
counters.addElement(counter);
}
return count;
}
}