ASTAdd.java

//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  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 Drew Davidson 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.
//--------------------------------------------------------------------------
package ariba.util.expr;

import ariba.util.fieldtype.NullTypeInfo;
import ariba.util.fieldtype.TypeInfo;

/**
 * @author Luke Blanshard (blanshlu@netscape.net)
 * @author Drew Davidson (drew@ognl.org)
 */
class ASTAdd extends ExpressionNode
{
    public ASTAdd(int id) {
        super(id);
    }

    public ASTAdd(ExprParser p, int id) {
        super(p, id);
    }

    public void jjtClose() {
        flattenTree();
    }

    protected Object getValueBody( ExprContext context, Object source ) throws ExprException
    {
        Object result = children[0].getValue( context, source );
        TypeInfo resultInfo = children[0].getTypeInfo();
        if (resultInfo == null || resultInfo instanceof NullTypeInfo) {
            resultInfo = getTypeInfo();
        }
        String resultType = resultInfo != null? resultInfo.getName(): null;
        for ( int i=1; i < children.length; ++i ) {
        	TypeInfo info = children[i].getTypeInfo();
            result = ExprOps.add(
                result, 
                children[i].getValue(context, source), 
                resultType,	
                info != null? info.getName(): null);
            resultType = result != null? result.getClass().getName(): null;
        }
        return result;
    }

    public String getExpressionOperator(int index)
    {
        return "+";
    }    

    public int getExpressionType ()
    {
        return ArithmeticExpression;
    }
}