/* Copyright 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.
*/
package org.apache.xmlbeans.impl.xquery.saxon;
import java.util.List;
import java.util.Map;
import java.util.Iterator;
import java.util.ListIterator;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.TransformerException;
import org.w3c.dom.Node;
import net.sf.saxon.Configuration;
import net.sf.saxon.dom.NodeOverNodeInfo;
import net.sf.saxon.om.NodeInfo;
import net.sf.saxon.query.DynamicQueryContext;
import net.sf.saxon.query.StaticQueryContext;
import net.sf.saxon.query.XQueryExpression;
import org.apache.xmlbeans.XmlRuntimeException;
import org.apache.xmlbeans.XmlTokenSource;
import org.apache.xmlbeans.impl.store.QueryDelegate;
public class XBeansXQuery
implements QueryDelegate.QueryInterface
{
private XQueryExpression xquery;
private String contextVar;
private Configuration config;
/**
* Construct given an XQuery expression string.
* @param query The XQuery expression
* @param contextVar The name of the context variable
* @param boundary The offset of the end of the prolog
*/
public XBeansXQuery(String query, String contextVar, Integer boundary)
{
config = new Configuration();
config.setDOMLevel(2);
config.setTreeModel(net.sf.saxon.event.Builder.STANDARD_TREE);
StaticQueryContext sc = new StaticQueryContext(config);
this.contextVar = contextVar;
int bdry = boundary.intValue();
//Saxon requires external variables at the end of the prolog...
query = (bdry == 0) ?
"declare variable $" +
contextVar + " external;" + query :
query.substring(0, bdry) +
"declare variable $" +
contextVar + " external;" +
query.substring(bdry);
try
{
xquery = sc.compileQuery(query);
}
catch (TransformerException e)
{
throw new XmlRuntimeException(e);
}
}
public List execQuery(Object node, Map variableBindings)
{
try
{
Node contextNode = (Node)node;
NodeInfo contextItem =
config.buildDocument(new DOMSource(contextNode));
//config.unravel(new DOMSource(contextNode));
DynamicQueryContext dc = new DynamicQueryContext(config);
dc.setContextItem(contextItem);
dc.setParameter(contextVar, contextItem);
// Set the other variables
if (variableBindings != null)
{
for (Iterator it = variableBindings.entrySet().iterator();
it.hasNext(); )
{
Map.Entry entry = (Map.Entry)it.next();
String key = (String)entry.getKey();
Object value = entry.getValue();
if (value instanceof XmlTokenSource)
{
Node paramObject = ((XmlTokenSource)value).getDomNode();
dc.setParameter(key, paramObject);
}
else if (value instanceof String)
dc.setParameter(key, value);
}
}
List saxonNodes = xquery.evaluate(dc);
for (ListIterator it = saxonNodes.listIterator(); it.hasNext(); )
{
Object o = it.next();
if(o instanceof NodeInfo)
{
Node n = NodeOverNodeInfo.wrap((NodeInfo)o);
it.set(n);
}
}
return saxonNodes;
}
catch (TransformerException e)
{
throw new RuntimeException("Error binding " + contextVar, e);
}
}
}