/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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() {
        // NOOP by default
    }

    /**
     * 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();
}
