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package org.apache.tuscany.container.rhino.rhino;
import org.apache.xmlbeans.XmlObject;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Wrapper;
import org.mozilla.javascript.xml.XMLObject;
/**
* An invoker for a specific function in a JavaScript script
*/
public class RhinoFunctionInvoker {
private Scriptable instanceScope;
private Function function;
private Class responseClass;
public RhinoFunctionInvoker(Scriptable instanceScope, Function function, Class responseClass) {
this.instanceScope = instanceScope;
this.function = function;
this.responseClass = responseClass;
}
public Object invoke(Object[] args) {
Context cx = Context.enter();
try {
Object[] jsArgs = toJavaScript(args, instanceScope, cx);
Object jsResponse = function.call(cx, instanceScope, instanceScope, jsArgs);
Object response = fromJavaScript(jsResponse);
return response;
} finally {
Context.exit();
}
}
protected Object[] toJavaScript(Object[] arg, Scriptable scope, Context cx) {
Object[] jsArgs;
if (arg == null) {
jsArgs = new Object[0];
} else if (arg.length == 1 && arg[0] instanceof XmlObject) {
Object jsXML = cx.getWrapFactory().wrap(cx, scope, (XmlObject) arg[0], XmlObject.class);
jsArgs = new Object[] { cx.newObject(scope, "XML", new Object[] { jsXML }) };
} else {
jsArgs = (Object[]) arg;
for (int i = 0; i < jsArgs.length; i++) {
jsArgs[i] = Context.toObject(jsArgs[i], scope);
}
}
return jsArgs;
}
protected Object fromJavaScript(Object o) {
Object response;
if (Context.getUndefinedValue().equals(o)) {
response = null;
} else if (o instanceof XMLObject) {
// TODO: E4X Bug? Shouldn't need this copy, but without it the outer element gets lost???
Scriptable jsXML = (Scriptable) ScriptableObject.callMethod((Scriptable) o, "copy", new Object[0]);
Wrapper wrapper = (Wrapper) ScriptableObject.callMethod(jsXML, "getXmlObject", new Object[0]);
response = wrapper.unwrap();
} else if (o instanceof Wrapper) {
response = ((Wrapper) o).unwrap();
} else {
if (responseClass != null) {
response = Context.jsToJava(o, responseClass);
} else {
response = Context.jsToJava(o, String.class);
}
}
return response;
}
}
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