/*
* Copyright 1999-2004 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: KeyManager.java,v 1.16 2004/02/16 20:41:30 minchau Exp $
*/
package org.apache.xalan.transformer;
import java.util.Vector;
import org.apache.xalan.templates.ElemTemplateElement;
import org.apache.xml.utils.PrefixResolver;
import org.apache.xml.utils.QName;
import org.apache.xml.utils.XMLString;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XNodeSet;
/**
* This class manages the key tables.
*/
public class KeyManager
{
/**
* Table of tables of element keys.
* @see org.apache.xalan.transformer.KeyTable
*/
private transient Vector m_key_tables = null;
/**
* Given a valid element key, return the corresponding node list.
*
* @param xctxt The XPath runtime state
* @param doc The document node
* @param name The key element name
* @param ref The key value we're looking for
* @param nscontext The prefix resolver for the execution context
*
* @return A nodelist of nodes mathing the given key
*
* @throws javax.xml.transform.TransformerException
*/
public XNodeSet getNodeSetDTMByKey(
XPathContext xctxt, int doc, QName name, XMLString ref, PrefixResolver nscontext)
throws javax.xml.transform.TransformerException
{
XNodeSet nl = null;
ElemTemplateElement template = (ElemTemplateElement) nscontext; // yuck -sb
if ((null != template)
&& null != template.getStylesheetRoot().getKeysComposed())
{
boolean foundDoc = false;
if (null == m_key_tables)
{
m_key_tables = new Vector(4);
}
else
{
int nKeyTables = m_key_tables.size();
for (int i = 0; i < nKeyTables; i++)
{
KeyTable kt = (KeyTable) m_key_tables.elementAt(i);
if (kt.getKeyTableName().equals(name) && doc == kt.getDocKey())
{
nl = kt.getNodeSetDTMByKey(name, ref);
if (nl != null)
{
foundDoc = true;
break;
}
}
}
}
if ((null == nl) &&!foundDoc /* && m_needToBuildKeysTable */)
{
KeyTable kt =
new KeyTable(doc, nscontext, name,
template.getStylesheetRoot().getKeysComposed(),
xctxt);
m_key_tables.addElement(kt);
if (doc == kt.getDocKey())
{
foundDoc = true;
nl = kt.getNodeSetDTMByKey(name, ref);
}
}
}
return nl;
}
}