package org.apache.commons.ognl;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

/**
 * $Id$
 */
class ASTNot
    extends BooleanExpression
{
    public ASTNot( int id )
    {
        super( id );
    }

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

    protected Object getValueBody( OgnlContext context, Object source )
        throws OgnlException
    {
        return OgnlOps.booleanValue( children[0].getValue( context, source ) ) ? Boolean.FALSE : Boolean.TRUE;
    }

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

    public String toGetSourceString( OgnlContext context, Object target )
    {
        try
        {

            String srcString = super.toGetSourceString( context, target );

            if ( srcString == null || srcString.trim().length() < 1 )
            {
                srcString = "null";
            }

            context.setCurrentType( Boolean.TYPE );

            return "(! org.apache.commons.ognl.OgnlOps.booleanValue(" + srcString + ") )";

        }
        catch ( Throwable t )
        {
            throw OgnlOps.castToRuntime( t );
        }
    }

    public <R, P> R accept( NodeVisitor<? extends R, ? super P> visitor, P data )
        throws OgnlException
    {
        return visitor.visit( this, data );
    }
}