/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/ext/EvaluateFunction.java,v 1.10 2006/02/05 21:47:42 elharo Exp $
* $Revision: 1.10 $
* $Date: 2006/02/05 21:47:42 $
*
* ====================================================================
*
* Copyright 2000-2002 bob mcwhirter & James Strachan.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the Jaxen Project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS 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 COPYRIGHT OWNER
* OR 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 Jaxen Project and was originally
* created by bob mcwhirter <bob@werken.com> and
* James Strachan <jstrachan@apache.org>. For more information on the
* Jaxen Project, please see <http://www.jaxen.org/>.
*
* $Id: EvaluateFunction.java,v 1.10 2006/02/05 21:47:42 elharo Exp $
*/
package org.orbeon.jaxen.function.ext;
import org.orbeon.jaxen.*;
import org.orbeon.jaxen.function.StringFunction;
import java.util.Collections;
import java.util.List;
/**
* <code><i>node-set</i> evaluate(<i>string</i>)</code>
*
* @author Erwin Bolwidt (ejb @ klomp.org)
*/
public class EvaluateFunction implements Function
{
public Object call( Context context, List args )
throws FunctionCallException
{
if ( args.size() == 1 ) {
return evaluate( context, args.get(0));
}
throw new FunctionCallException( "evaluate() requires one argument" );
}
public static List evaluate (Context context, Object arg)
throws FunctionCallException
{
List contextNodes = context.getNodeSet();
if (contextNodes.size() == 0)
return Collections.EMPTY_LIST;
Navigator nav = context.getNavigator();
String xpathString;
if ( arg instanceof String )
xpathString = (String)arg;
else
xpathString = StringFunction.evaluate(arg, nav);
try {
XPath xpath = nav.parseXPath(xpathString);
ContextSupport support = context.getContextSupport();
xpath.setVariableContext( support.getVariableContext() );
xpath.setFunctionContext( support.getFunctionContext() );
xpath.setNamespaceContext( support.getNamespaceContext() );
return xpath.selectNodes( context.duplicate() );
}
catch ( org.orbeon.jaxen.saxpath.SAXPathException e ) {
throw new FunctionCallException(e.toString());
}
}
}