/*
* $Header$
* $Revision: 1261 $
* $Date: 2006-11-30 10:49:27 -0800 (Thu, 30 Nov 2006) $
*
* ====================================================================
*
* 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: DefaultUnionExpr.java 1261 2006-11-30 18:49:27Z elharo $
*/
package org.jaxen.expr;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.jaxen.Context;
import org.jaxen.JaxenException;
import org.jaxen.XPathSyntaxException;
/**
* @deprecated this class will become non-public in the future;
* use the interface instead
*/
public class DefaultUnionExpr extends DefaultBinaryExpr implements UnionExpr
{
/**
*
*/
private static final long serialVersionUID = 7629142718276852707L;
public DefaultUnionExpr(Expr lhs,
Expr rhs)
{
super( lhs,
rhs );
}
public String getOperator()
{
return "|";
}
public String toString()
{
return "[(DefaultUnionExpr): " + getLHS() + ", " + getRHS() + "]";
}
public Object evaluate(Context context) throws JaxenException
{
List results = new ArrayList();
try {
List lhsResults = (List) getLHS().evaluate( context );
List rhsResults = (List) getRHS().evaluate( context );
Set unique = new HashSet();
results.addAll( lhsResults );
unique.addAll( lhsResults );
Iterator rhsIter = rhsResults.iterator();
while ( rhsIter.hasNext() )
{
Object each = rhsIter.next();
if ( ! unique.contains( each ) )
{
results.add( each );
unique.add( each );
}
}
Collections.sort(results, new NodeComparator(context.getNavigator()));
return results;
}
catch (ClassCastException e) {
throw new XPathSyntaxException(this.getText(), context.getPosition(), "Unions are only allowed over node-sets");
}
}
}