/*
* Copyright 2005 The Apache Software Foundation
*
* 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 org.apache.felix.mishell;
import java.util.List;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
/**
* 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)
*
*/
public class OSGiScriptEngineFactory implements ScriptEngineFactory{
private ScriptEngineFactory factory;
private ClassLoader contextClassLoader;
public OSGiScriptEngineFactory (ScriptEngineFactory factory, ClassLoader contextClassLoader){
this.factory=factory;
this.contextClassLoader=contextClassLoader;
}
public String getEngineName() {
return factory.getEngineName();
}
public String getEngineVersion() {
return factory.getEngineVersion();
}
public List<String> getExtensions() {
return factory.getExtensions();
}
public String getLanguageName() {
return factory.getLanguageName();
}
public String getLanguageVersion() {
return factory.getLanguageVersion();
}
public String getMethodCallSyntax(String obj, String m, String... args) {
return factory.getMethodCallSyntax(obj, m, args);
}
public List<String> getMimeTypes() {
return factory.getMimeTypes();
}
public List<String> getNames() {
return factory.getNames();
}
public String getOutputStatement(String toDisplay) {
return factory.getOutputStatement(toDisplay);
}
public Object getParameter(String key) {
return factory.getParameter(key);
}
public String getProgram(String... statements) {
return factory.getProgram(statements);
}
public ScriptEngine getScriptEngine() {
ScriptEngine engine=null;
if(contextClassLoader!=null){
ClassLoader old=Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(contextClassLoader);
engine=factory.getScriptEngine();
Thread.currentThread().setContextClassLoader(old);
}
else engine=factory.getScriptEngine();
return engine;
}
}