/*
* $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultFilterExpr.java,v 1.18 2006/05/03 16:07:02 elharo Exp $
* $Revision: 1.18 $
* $Date: 2006/05/03 16:07:02 $
*
* ====================================================================
*
* 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: DefaultFilterExpr.java,v 1.18 2006/05/03 16:07:02 elharo Exp $
*/
package org.orbeon.jaxen.expr;
import org.orbeon.jaxen.Context;
import org.orbeon.jaxen.JaxenException;
import java.util.ArrayList;
import java.util.List;
/**
* @deprecated this class will become non-public in the future;
* use the interface instead
*/
public class DefaultFilterExpr extends DefaultExpr implements FilterExpr, Predicated
{
/**
*
*/
private static final long serialVersionUID = -549640659288005735L;
private Expr expr;
private PredicateSet predicates;
public DefaultFilterExpr(PredicateSet predicateSet)
{
this.predicates = predicateSet;
}
public DefaultFilterExpr(Expr expr, PredicateSet predicateSet)
{
this.expr = expr;
this.predicates = predicateSet;
}
public void addPredicate(Predicate predicate)
{
this.predicates.addPredicate( predicate );
}
public List getPredicates()
{
return this.predicates.getPredicates();
}
public PredicateSet getPredicateSet()
{
return this.predicates;
}
public Expr getExpr()
{
return this.expr;
}
public String toString()
{
return "[(DefaultFilterExpr): expr: " + expr + " predicates: " + predicates + " ]";
}
public String getText()
{
String text = "";
if ( this.expr != null )
{
text = this.expr.getText();
}
text += predicates.getText();
return text;
}
public Expr simplify()
{
this.predicates.simplify();
if ( this.expr != null )
{
this.expr = this.expr.simplify();
}
if ( this.predicates.getPredicates().size() == 0 )
{
return getExpr();
}
return this;
}
/** Returns true if the current filter matches at least one of the context nodes
*/
public boolean asBoolean(Context context) throws JaxenException
{
Object results = null;
if ( expr != null )
{
results = expr.evaluate( context );
}
else
{
List nodeSet = context.getNodeSet();
ArrayList list = new ArrayList(nodeSet.size());
list.addAll( nodeSet );
results = list;
}
if ( results instanceof Boolean )
{
Boolean b = (Boolean) results;
return b.booleanValue();
}
if ( results instanceof List )
{
return getPredicateSet().evaluateAsBoolean(
(List) results, context.getContextSupport()
);
}
return false;
}
public Object evaluate(Context context) throws JaxenException
{
Object results = getExpr().evaluate( context );
if ( results instanceof List )
{
List newresults = getPredicateSet().evaluatePredicates( (List) results,
context.getContextSupport() );
results = newresults;
}
return results;
}
public void accept(Visitor visitor)
{
visitor.visit(this);
}
}