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/*
* 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.apache.tuscany.container.javascript;
import java.io.ByteArrayInputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import javax.xml.stream.XMLStreamReader;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.impl.builder.StAXOMBuilder;
import org.apache.axiom.om.util.StAXUtils;
import org.apache.xmlbeans.XmlObject;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Wrapper;
import org.mozilla.javascript.xml.XMLObject;
/**
* This Interceptor encasulates the data mediation required by the JavaScriptReferenceProxy. The
* invocation handler of this class traps the javascript reference calls, performs data mediation
* and calls then calls the actual referred service. This classes implementation is subject to
* review and change when the DataMediation infrastructure of Tuscany is ready.
*
*/
public class JavaScriptRefInvocInterceptor implements InvocationHandler {
private Object actualProxy;
private Class wireInterface;
private Scriptable instanceScope;
JavaScriptRefInvocInterceptor(Object wireProxy, Class wireIfc, Scriptable instScope) {
this.actualProxy = wireProxy;
this.wireInterface = wireIfc;
this.instanceScope = instScope;
}
public Object invoke(Object arg0, Method method, Object[] args) throws Throwable {
// TODO Auto-generated method stub
Context cx = Context.enter();
try {
Method invokedMethod = getInvokedMethod(method.getName());
Object[] tranformedArgs = new Object[args.length];
for (int count = 0; count < args.length; ++count) {
tranformedArgs[count] = fromJavaScript(invokedMethod.getParameterTypes()[count], args[count]);
}
Object response = invokedMethod.invoke(actualProxy, tranformedArgs);
response = toJavaScript(response, instanceScope, cx);
return response;
} finally {
Context.exit();
}
}
private Method getInvokedMethod(String methodName) {
Method[] methods = wireInterface.getMethods();
for (int count = 0; count < methods.length; ++count) {
if (methods[count].getName().equals(methodName)) {
return methods[count];
}
}
throw new RuntimeException("Unable to find invocation method");
}
protected Object fromJavaScript(Class reqArgType, Object jsArg) throws Exception {
Object javaArg;
if (Context.getUndefinedValue().equals(jsArg)) {
javaArg = null;
} else if (jsArg instanceof XMLObject) {
// TODO: E4X Bug? Shouldn't need this copy, but without it the outer element gets lost???
Scriptable jsXML = (Scriptable) ScriptableObject.callMethod((Scriptable) jsArg, "copy", new Object[0]);
Wrapper wrapper = (Wrapper) ScriptableObject.callMethod(jsXML, "getXmlObject", new Object[0]);
javaArg = wrapper.unwrap();
XMLStreamReader xmlReader = StAXUtils.createXMLStreamReader(new ByteArrayInputStream(javaArg.toString().getBytes()));
StAXOMBuilder staxOMBuilder = new StAXOMBuilder(OMAbstractFactory.getOMFactory(), xmlReader);
javaArg = staxOMBuilder.getDocumentElement();
} else if (jsArg instanceof Wrapper) {
javaArg = ((Wrapper) jsArg).unwrap();
} else {
if (reqArgType != null) {
javaArg = Context.jsToJava(jsArg, reqArgType);
} else {
javaArg = Context.jsToJava(jsArg, String.class);
}
}
return javaArg;
}
protected Object toJavaScript(Object retVal, Scriptable scope, Context cx) throws RuntimeException {
Object jsRetVal;
if (retVal instanceof OMElement) {
try {
XmlObject xmlObject = XmlObject.Factory.parse(retVal.toString());
Object jsXML = cx.getWrapFactory().wrap(cx, scope, xmlObject, XmlObject.class);
jsRetVal = cx.newObject(scope, "XML", new Object[] { jsXML });
} catch (Exception e) {
throw new RuntimeException(e);
}
} else if (retVal instanceof XmlObject) {
Object jsXML = cx.getWrapFactory().wrap(cx, scope, (XmlObject) retVal, XmlObject.class);
jsRetVal = cx.newObject(scope, "XML", new Object[] { jsXML });
} else {
jsRetVal = Context.toObject(retVal, scope);
}
return jsRetVal;
}
}
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