/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.osgi;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import java.util.List;
/**
* This is a wrapper class for the ScriptEngineFactory class that deals with context class loader issues
* It is necessary because engines (at least ruby) use the context classloader to find their resources
* (i.e., their "native" classes)
*/
/*
Imported from Apache Felix project.
http://svn.apache.org/repos/asf/felix/trunk/mishell/src/main/java/org/apache/felix/mishell/OSGiScriptEngineFactory.java
*/
public class OSGiScriptEngineFactory implements ScriptEngineFactory {
private ScriptEngineFactory factory;
private ClassLoader contextClassLoader;
public OSGiScriptEngineFactory(ScriptEngineFactory factory, ClassLoader contextClassLoader) {
this.factory = factory;
this.contextClassLoader = contextClassLoader;
}
@Override
public String getEngineName() {
return factory.getEngineName();
}
@Override
public String getEngineVersion() {
return factory.getEngineVersion();
}
@Override
public List<String> getExtensions() {
return factory.getExtensions();
}
@Override
public String getLanguageName() {
return factory.getLanguageName();
}
@Override
public String getLanguageVersion() {
return factory.getLanguageVersion();
}
@Override
public String getMethodCallSyntax(String obj, String m, String... args) {
return factory.getMethodCallSyntax(obj, m, args);
}
@Override
public List<String> getMimeTypes() {
return factory.getMimeTypes();
}
@Override
public List<String> getNames() {
return factory.getNames();
}
@Override
public String getOutputStatement(String toDisplay) {
return factory.getOutputStatement(toDisplay);
}
@Override
public Object getParameter(String key) {
return factory.getParameter(key);
}
@Override
public String getProgram(String... statements) {
return factory.getProgram(statements);
}
@Override
public ScriptEngine getScriptEngine() {
ScriptEngine engine;
if (contextClassLoader == null) {
engine = factory.getScriptEngine();
} else {
Thread currentThread = Thread.currentThread();
ClassLoader old = currentThread.getContextClassLoader();
currentThread.setContextClassLoader(contextClassLoader);
engine = factory.getScriptEngine();
currentThread.setContextClassLoader(old);
}
return engine;
}
}