net.hasor.dataql.fx.db.ognl.ASTNegate Maven / Gradle / Ivy

//--------------------------------------------------------------------------
//	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
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//	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
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//  DAMAGE.
//--------------------------------------------------------------------------
package ognl;

/**
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
class ASTNegate extends NumericExpression
{
    public ASTNegate(int id) {
        super(id);
    }

    public ASTNegate(OgnlParser p, int id) {
        super(p, id);
    }

    protected Object getValueBody( OgnlContext context, Object source ) throws OgnlException
    {
        return OgnlOps.negate( _children[0].getValue(context, source) );
    }

    public String toString()
    {
        return "-" + _children[0];
    }

    public String toGetSourceString(OgnlContext context, Object target)
    {
        String source = _children[0].toGetSourceString(context, target);

        if (!ASTNegate.class.isInstance(_children[0]))
        {
            return "-" + source;
        } else
        {
            return "-(" + source + ")";
        }
    }

    @Override
    public boolean isOperation(OgnlContext context) throws OgnlException {
        if (_children.length == 1) {
            SimpleNode child = (SimpleNode) _children[0];
            return child.isOperation(context) || !child.isConstant(context);
        }
        return super.isOperation(context);
    }
}