/*
 * Copyright 2002,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.jexl.parser;

import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.util.Coercion;

/**
 *  GT : a > b
 *
 *  Follows A.3.6.1 of the JSTL 1.0 specification
 *
 *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 *  @author <a href="mailto:proyal@apache.org">Peter Royal</a>
 *  @version $Id: ASTGTNode.java,v 1.5 2004/02/28 13:45:20 yoavs Exp $
 */
public class ASTGTNode extends SimpleNode
{
    public ASTGTNode( int id )
    {
        super( id );
    }

    public ASTGTNode( Parser p, int id )
    {
        super( p, id );
    }

    /** Accept the visitor. **/
    public Object jjtAccept( ParserVisitor visitor, Object data )
    {
        return visitor.visit( this, data );
    }

    public Object value( JexlContext jc )
        throws Exception
    {
        /*
         * now get the values
         */

        Object left = ( (SimpleNode)jjtGetChild( 0 ) ).value( jc );
        Object right = ( (SimpleNode)jjtGetChild( 1 ) ).value( jc );

        if( ( left == right ) || ( left == null ) || ( right == null ) )
        {
            return Boolean.FALSE;
        }
        else if( Coercion.isFloatingPoint( left ) || Coercion.isFloatingPoint( right ) )
        {
            double leftDouble = Coercion.coerceDouble( left ).doubleValue();
            double rightDouble = Coercion.coerceDouble( right ).doubleValue();

            return leftDouble > rightDouble
                ? Boolean.TRUE
                : Boolean.FALSE;
        }
        else if( Coercion.isNumberable( left ) || Coercion.isNumberable( right ) )
        {
            long leftLong = Coercion.coerceLong( left ).longValue();
            long rightLong = Coercion.coerceLong( right ).longValue();

            return leftLong > rightLong
                ? Boolean.TRUE
                : Boolean.FALSE;
        }
        else if( left instanceof String || right instanceof String )
        {
            String leftString = left.toString();
            String rightString = right.toString();

            return leftString.compareTo( rightString ) > 0
                ? Boolean.TRUE
                : Boolean.FALSE;
        }
        else if( left instanceof Comparable )
        {
            return ( (Comparable)left ).compareTo( right ) > 0
                ? Boolean.TRUE
                : Boolean.FALSE;
        }
        else if( right instanceof Comparable )
        {
            return ( (Comparable)right ).compareTo( left ) < 0
                ? Boolean.TRUE
                : Boolean.FALSE;
        }

        throw new Exception( "Invalid comparison : GT " );
    }
}