001    /*
002    * Licensed to the Apache Software Foundation (ASF) under one or more
003    * contributor license agreements.  See the NOTICE file distributed with
004    * this work for additional information regarding copyright ownership.
005    * The ASF licenses this file to You under the Apache License, Version 2.0
006    * (the "License"); you may not use this file except in compliance with
007    * the License.  You may obtain a copy of the License at
008    *
009    *     http://www.apache.org/licenses/LICENSE-2.0
010    *
011    * Unless required by applicable law or agreed to in writing, software
012    * distributed under the License is distributed on an "AS IS" BASIS,
013    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014    * See the License for the specific language governing permissions and
015    * limitations under the License.
016    */ 
017    package javax.servlet.jsp;
018    
019    /**
020     * The JspEngineInfo is an abstract class that provides information on the
021     * current JSP engine.
022     */
023    
024    public abstract class JspEngineInfo {
025    
026        /**
027         * Sole constructor. (For invocation by subclass constructors, 
028         * typically implicit.)
029         */
030        public JspEngineInfo() {
031        }
032        
033        /**
034         * Return the version number of the JSP specification that is supported by
035         * this JSP engine.
036         * <p>
037         * Specification version numbers that consists of positive decimal integers
038         * separated by periods ".", for example, "2.0" or "1.2.3.4.5.6.7".
039         * This allows an extensible number to be used to
040         * represent major, minor, micro, etc versions.
041         * The version number must begin with a number.
042         * </p>
043         *
044         * @return the specification version, null is returned if it is not known
045         */
046    
047        public abstract String getSpecificationVersion();
048    }