content: /*
   * $Header$
   * $Revision$
   * $Date$
   *
   * ====================================================================
   *
   * 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/>.
   * 
   * $Id$
   */
  
  
  
  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;
      }
  
  }
  