/**
 * 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 net.sourceforge.seqware.webservice.resources;

import java.util.Properties;

/**
 * This is borrowed from OpenEJB.
 * 
 * @version $Rev$ $Date$
 */
public enum TomcatVersion {

    v3, v40, v41, v50, v55, v6, v7, UNKNOWN;

    private String serverNumber;
    private String serverBuilt;

    private static TomcatVersion version;

    public String getServerNumber() {
        return serverNumber;
    }

    public String getServerBuilt() {
        return serverBuilt;
    }

    public boolean isTheVersion() {
        return get() == this;
    }

    public static boolean hasAnnotationProcessingSupport() {
        switch (get()) {
        case v40:
        case v41:
        case v50:
        case v55:
            return false;
        default:
            return true;
        }
    }

    public static TomcatVersion get() {
        if (version != null) return version;

        try {
            // tomcat.version and tomcat.built properties should be added
            // to System by TomcatHook
            String serverNumber = System.getProperty("tomcat.version");
            String serverBuilt = System.getProperty("tomcat.built");

            // This fallback block will only work in Tomcat6 since the
            // common class loader in previous versions can not see the
            // catalina.jar which contains the ServerInfo.properties
            if (serverNumber == null) {
                Properties properties = new Properties();
                ClassLoader classLoader = TomcatVersion.class.getClassLoader();
                properties.load(classLoader.getResourceAsStream("org/apache/catalina/util/ServerInfo.properties"));

                serverNumber = properties.getProperty("server.number");
                if (serverNumber == null) {
                    // Tomcat 5.0 and earlier only has server.info
                    String serverInfo = properties.getProperty("server.info");
                    if (serverInfo != null) {
                        int slash = serverInfo.indexOf('/');
                        serverNumber = serverInfo.substring(slash + 1);
                    }
                }

                serverBuilt = properties.getProperty("server.built");
            }

            if (serverNumber.startsWith("3"))
                version = v3;
            else if (serverNumber.startsWith("4.0"))
                version = v40;
            else if (serverNumber.startsWith("4.1"))
                version = v41;
            else if (serverNumber.startsWith("5.0"))
                version = v50;
            else if (serverNumber.startsWith("5.5"))
                version = v55;
            else if (serverNumber.startsWith("6."))
                version = v6;
            else if (serverNumber.startsWith("7."))
                version = v7;
            else
                version = UNKNOWN;

            version.serverNumber = serverNumber;
            version.serverBuilt = serverBuilt;

            return version;
        } catch (Exception e) {
            return UNKNOWN;
        }
    }
}