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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates and others.
 * All rights reserved.
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed 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.
 */

package jakarta.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.
     * 
     * 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.
     * 
     *
     * @return the specification version, null is returned if it is not known
     */
    public abstract String getSpecificationVersion();
}