PatternNotExpr.java

/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * http://www.espertech.com                                                           *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the GPL license       *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package com.espertech.esper.client.soda;

import java.io.StringWriter;

/**
 * Not-expression for negating a pattern sub-expression for use in pattern expressions. 
 */
public class PatternNotExpr extends PatternExprBase
{
    private static final long serialVersionUID = -7739688374458616308L;

    /**
     * Ctor - for use to create a pattern expression tree, without pattern child expression.
     */
    public PatternNotExpr()
    {
    }

    /**
     * Ctor.
     * @param inner is the pattern expression to negate
     */
    public PatternNotExpr(PatternExpr inner)
    {
        this.getChildren().add(inner);    
    }

    public PatternExprPrecedenceEnum getPrecedence() {
        return PatternExprPrecedenceEnum.EVERY_NOT;
    }

    public void toPrecedenceFreeEPL(StringWriter writer, EPStatementFormatter formatter)
    {
        writer.write("not ");
        this.getChildren().get(0).toEPL(writer, getPrecedence(), formatter);
    }
}