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A lib to access XML via XPath
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/*
 * $Header: /cvs/jaxen/jaxen/src/java/main/org/jaxen/expr/DefaultTruthExpr.java,v 1.10 2006/02/05 21:47:40 elharo Exp $
 * $Revision: 1.10 $
 * $Date: 2006/02/05 21:47:40 $
 *
 * ====================================================================
 *
 * 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  and 
 * James Strachan .  For more information on the 
 * Jaxen Project, please see .
 * 
 * $Id: DefaultTruthExpr.java,v 1.10 2006/02/05 21:47:40 elharo Exp $
 */



package org.navimatrix.jaxen.expr;

import java.util.List;

abstract class DefaultTruthExpr extends DefaultBinaryExpr 
{
    DefaultTruthExpr(Expr lhs,
                            Expr rhs)
    {
        super( lhs,
               rhs );
    }

    public String toString()
    {
        return "[(DefaultTruthExpr): " + getLHS() + ", " + getRHS() + "]";
    }

    protected boolean bothAreSets(Object lhs,
                                  Object rhs)
    {
        return ( lhs instanceof List
                 &&
                 rhs instanceof List );
    }

    protected boolean eitherIsSet(Object lhs,
                                  Object rhs)
    {
        return ( lhs instanceof List
                 ||
                 rhs instanceof List );
    }

    protected boolean isSet(Object obj)
    {
        return ( obj instanceof List );
    }
    
    protected boolean setIsEmpty( List set )
      {
      return (set == null || set.size() == 0);
      }

    protected boolean eitherIsBoolean(Object lhs,
                                      Object rhs)
    {
        return ( lhs instanceof Boolean
                 ||
                 rhs instanceof Boolean );
    }

    protected boolean bothAreBoolean(Object lhs,
                                     Object rhs)
    {
        return ( lhs instanceof Boolean
                 &&
                 rhs instanceof Boolean );
    }

    protected boolean eitherIsNumber(Object lhs,
                                     Object rhs)
    {
        return ( lhs instanceof Number
                 ||
                 rhs instanceof Number );
    } 

}