nonbooleanexprexception.java

drools 一个开放源码的规则引擎

package org.drools.semantics.python;

/*
 * $Id: NonBooleanExprException.java,v 1.2 2004/09/17 00:34:39 mproctor Exp $
 * 
 * Copyright 2002 (C) The Werken Company. All Rights Reserved.
 * 
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 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 * 
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
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 * For written permission, please contact [e-mail].
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 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a registered trademark of The Werken Company.
 * 
 * 5. Due credit should be given to The Werken Company.
 * (http://drools.werken.com/).
 * 
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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import org.drools.spi.ConditionException;

/**
 * Indicates an attempt to use a non-boolean expression in a condition.
 * 
 * @author <a href="mailto:[e-mail]">bob mcwhirter </a>
 * 
 * @version $Id: NonBooleanExprException.java,v 1.2 2004/09/17 00:34:39 mproctor Exp $
 */
public class NonBooleanExprException extends ConditionException
{
    // ------------------------------------------------------------
    //     Instance members
    // ------------------------------------------------------------

    /** The expression. */
    private String expr;

    // ------------------------------------------------------------
    //     Constructors
    // ------------------------------------------------------------

    /**
     * Construct.
     * 
     * @param expr The invalid expression.
     */
    public NonBooleanExprException(String expr)
    {
        this.expr = expr;
    }

    // ------------------------------------------------------------
    //     Instance Methods
    // ------------------------------------------------------------

    /**
     * Retrieve the non-boolean expression.
     * 
     * @return The expression.
     */
    public String getExpression()
    {
        return this.expr;
    }

    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    //     java.lang.Throwable
    // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    /**
     * Retrieve the error message.
     * 
     * @return The error message.
     */
    public String getMessage()
    {
        return "Not a boolean expression: " + getExpression( );
    }
}