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package org.apache.tuscany.container.rhino.rhino;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.UniqueTag;
/**
* An invokeable instance of a JavaScript script.
*/
public class RhinoScriptInstance {
private Scriptable scriptScope;
private Scriptable instanceScope;
private Map<String, Class> responseClasses;
public RhinoScriptInstance(Scriptable scriptScope, Scriptable instanceScope, Map<String, Object> context, Map<String, Class> responseClasses) {
this.scriptScope = scriptScope;
this.instanceScope = instanceScope;
this.responseClasses = responseClasses;
if (this.responseClasses == null) {
this.responseClasses = new HashMap<String, Class>();
}
addContexts(instanceScope, context);
}
public Object invokeFunction(String functionName, Object[] args) {
RhinoFunctionInvoker invoker = createRhinoFunctionInvoker(functionName);
return invoker.invoke(args);
}
public RhinoFunctionInvoker createRhinoFunctionInvoker(String functionName) {
Function function = getFunction(functionName);
Class responseClass = responseClasses.get(functionName);
RhinoFunctionInvoker invoker = new RhinoFunctionInvoker(instanceScope, function, responseClass);
return invoker;
}
/**
* Add the context to the scope. This will make the objects available to a script by using the name it was added with.
*/
protected void addContexts(Scriptable scope, Map contexts) {
if (contexts != null) {
Context.enter();
try {
for (Iterator i = contexts.keySet().iterator(); i.hasNext();) {
String name = (String) i.next();
Object value = contexts.get(name);
if (value != null) {
scope.put(name, scope, Context.toObject(value, scope));
}
}
} finally {
Context.exit();
}
}
}
/**
* Get the Rhino Function object for the named script function
*/
protected Function getFunction(String functionName) {
Object handleObj = scriptScope.get(functionName, instanceScope);
if (UniqueTag.NOT_FOUND.equals(handleObj)) {
// Bit of a hack so E4X scripts don't need to define a function for every operation
handleObj = scriptScope.get("process", instanceScope);
}
if (!(handleObj instanceof Function)) {
throw new RuntimeException("script function '" + functionName + "' is undefined or not a function");
}
return (Function) handleObj;
}
}
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