/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * Portions Copyright Apache Software Foundation.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
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 * Header, with the fields enclosed by brackets [] replaced by your own
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 */
package javax.servlet.jsp;

/**
 * The JspEngineInfo is an abstract class that provides information on the
 * current JSP engine.
 */

public abstract class JspEngineInfo {

    /**
     * Sole constructor. (For invocation by subclass constructors, 
     * typically implicit.)
     */
    public JspEngineInfo() {
    }
    
    /**
     * Return the version number of the JSP specification that is supported by
     * this JSP engine.
     * <p>
     * Specification version numbers that consists of positive decimal integers
     * separated by periods ".", for example, "2.0" or "1.2.3.4.5.6.7".
     * This allows an extensible number to be used to
     * represent major, minor, micro, etc versions.
     * The version number must begin with a number.
     * </p>
     *
     * @return the specification version, null is returned if it is not known
     */

    public abstract String getSpecificationVersion();
}