/*
 * Copyright 2003,2004 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;

/**
 *  %
 *
 *  @author <a href="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
 *  @version $Id: ASTModNode.java,v 1.4 2004/02/28 13:45:20 yoavs Exp $
 */
public class ASTModNode extends SimpleNode
{
    public ASTModNode(int id)
    {
        super(id);
    }

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

        /*
         *  the spec says 'and', I think 'or'
         */
        if (left == null && right == null)
            return new Integer(0);

        /*
         *  if anything is float, double or string with ( "." | "E" | "e")
         *  coerce all to doubles and do it
         */
        if ( left instanceof Float || left instanceof Double
            || right instanceof Float || right instanceof Double
            || (  left instanceof String
                  && (  ((String) left).indexOf(".") != -1 ||
                        ((String) left).indexOf("e") != -1 ||
                        ((String) left).indexOf("E") != -1 )
               )
            || (  right instanceof String
                  && (  ((String) right).indexOf(".") != -1 ||
                        ((String) right).indexOf("e") != -1 ||
                        ((String) right).indexOf("E") != -1 )
               )
            )
        {
            Double l = Coercion.coerceDouble(left);
            Double r = Coercion.coerceDouble(right);

            /*
             * catch div/0
             */
            if (r.doubleValue() == 0.0)
                return new Double(0.0);

            return new Double(l.doubleValue() % r.doubleValue());
        }

        /*
         * otherwise to longs with thee!
         */

        Long l = Coercion.coerceLong(left);
        Long r = Coercion.coerceLong(right);

        /*
         * catch the div/0
         */
        if (r.longValue() == 0)
            return new Long(0);

        return new Long(l.longValue() % r.longValue());
    }

}