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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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.tuscany.container.ruby.invoker;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import org.eclipse.emf.common.util.URI;
import org.apache.bsf.BSFManager;
import org.apache.bsf.util.IOUtils;
import org.jruby.RubyObject;
/**
* Models a Ruby script.
*/
public class RubyScript {
// Script to run.
private String script;
private BSFManager bsfManager;
/**
* Initializes the script name.
* @param script Full path to the script.
*/
public RubyScript(String script) {
this.script = script;
// Register the BSF Engine
BSFManager.registerScriptingEngine("ruby", "org.jruby.javasupport.bsf.JRubyEngine",
new String[] { "rb" });
bsfManager = new BSFManager();
}
/**
* Executes the script.
* @param methodName Name of the method to be executed.
* @param args Arguments to the method.
* @return Result of invocation.
* @throws CompilationFailedException
* @throws InstantiationException
* @throws IllegalAccessException
*/
public Object runScript(String methodName, Object[] args) throws InstantiationException, IllegalAccessException {
ClassLoader classLoader = getClass().getClassLoader();
try {
// Get the Ruby Class
Object rubyClass = getRubyClass(classLoader, script);
Method rubyMethod = findFunction(rubyClass, methodName);
Object result = null;
if(rubyMethod != null) {
result = rubyMethod.invoke(rubyClass, args);
}
return result;
} catch(Exception ex) {
ex.printStackTrace();
}
return null;
}
// Gives the Ruby class for the corresponding script
// Can optimize in future by caching the instance
private Object getRubyClass(ClassLoader classLoader, String rubyScriptName) throws Exception {
// Load the ruby script
InputStream inputStream = classLoader.getResourceAsStream(rubyScriptName);
String script = IOUtils.getStringFromReader(new InputStreamReader(inputStream));
bsfManager.exec("ruby", "(java)", 1, 1, script);
// Get the Ruby class
String rubyClassName=URI.createURI(rubyScriptName).trimFileExtension().lastSegment();
Object rubyClass = bsfManager.eval("ruby", "(java)", 1, 1, rubyClassName+".new");
return rubyClass;
}
// Find whether a particular method exists
private Method findFunction(Object rubyClass, String functionName) throws Exception {
Class[] parameterTypes = new Class[]{String.class};
Method method = rubyClass.getClass().getMethod(functionName, parameterTypes);
return method;
}
}
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