/*

  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/expr/DefaultFilterExpr.java,v 1.19 2006/11/30 18:49:26 elharo Exp $

  * $Revision: 1.19 $

  * $Date: 2006/11/30 18:49:26 $

  *

  * ====================================================================

  *

  * 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 1.19 2006/11/30 18:49:26 elharo Exp $

  */

 package org.jaxen.expr;

 import java.util.ArrayList;

 import java.util.List;

 import org.jaxen.Context;

 import org.jaxen.JaxenException;

 /**

  * @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;

     }

 }