/*
* 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 org.codehaus.groovy.vmplugin;
/**
* Factory class to get functionality based on the VM version.
* The usage of this class is not for public use, only for the
* runtime.
* @author Jochen Theodorou
*/
public class VMPluginFactory {
private static final String JDK5_CLASSNAME_CHECK = "java.lang.annotation.Annotation";
private static final String JDK6_CLASSNAME_CHECK = "javax.script.ScriptEngine";
private static final String JDK7_CLASSNAME_CHECK = "java.util.Objects";
private static final String JDK5_PLUGIN_NAME = "org.codehaus.groovy.vmplugin.v5.Java5";
private static final String JDK6_PLUGIN_NAME = "org.codehaus.groovy.vmplugin.v6.Java6";
private static final String JDK7_PLUGIN_NAME = "org.codehaus.groovy.vmplugin.v7.Java7";
private static VMPlugin plugin;
static {
plugin = createPlugin(JDK7_CLASSNAME_CHECK, JDK7_PLUGIN_NAME);
if (plugin == null) {
// v6 plugin is the same as v5 but with some scripting stuff
// so check below is good enough for now (can be true for JVM 5)
plugin = createPlugin(JDK6_CLASSNAME_CHECK, JDK6_PLUGIN_NAME);
}
if (plugin == null) {
plugin = createPlugin(JDK5_CLASSNAME_CHECK, JDK5_PLUGIN_NAME);
}
}
public static VMPlugin getPlugin() {
return plugin;
}
private static VMPlugin createPlugin(String classNameCheck, String pluginName) {
try {
ClassLoader loader = VMPluginFactory.class.getClassLoader();
loader.loadClass(classNameCheck);
return (VMPlugin) loader.loadClass(pluginName).newInstance();
} catch (Throwable ex) {
return null;
}
}
}