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 *  or more contributor license agreements.  See the NOTICE file
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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
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package org.apache.cayenne.exp.parser;

import java.io.PrintWriter;

import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.util.ConversionUtil;

/**
 * "Not" expression.
 * 
 * @since 1.1
 * @author Andrei Adamchik
 */
public class ASTNot extends AggregateConditionNode {

    ASTNot(int id) {
        super(id);
    }

    public ASTNot() {
        super(ExpressionParserTreeConstants.JJTNOT);
    }

    public ASTNot(Node expression) {
        super(ExpressionParserTreeConstants.JJTNOT);
        jjtAddChild(expression, 0);
    }

    protected Object evaluateNode(Object o) throws Exception {
        int len = jjtGetNumChildren();
        if (len == 0) {
            return Boolean.FALSE;
        }

        return ConversionUtil.toBoolean(evaluateChild(0, o))
            ? Boolean.FALSE
            : Boolean.TRUE;
    }

    /**
     * Creates a copy of this expression node, without copying children.
     */
    public Expression shallowCopy() {
        return new ASTNot(id);
    }

    public int getType() {
        return Expression.NOT;
    }

    public void encodeAsString(PrintWriter pw) {
        pw.print("not ");
        super.encodeAsString(pw);
    }

    protected String getExpressionOperator(int index) {
        throw new UnsupportedOperationException(
            "No operator for '" + ExpressionParserTreeConstants.jjtNodeName[id] + "'");
    }
}