public Object build(Script script) {
// this used to be synchronized, but we also used to remove the
// metaclass. Since adding the metaclass is now a side effect, we
// don't need to ensure the meta-class won't be observed and don't
// need to hide the side effect.
MetaClass scriptMetaClass = script.getMetaClass();
script.setMetaClass(new FactoryInterceptorMetaClass(scriptMetaClass, this));
script.setBinding(this);
Object oldScriptName = getProxyBuilder().getVariables().get(SCRIPT_CLASS_NAME);
try {
getProxyBuilder().setVariable(SCRIPT_CLASS_NAME, script.getClass().getName());
return script.run();
} finally {
if (oldScriptName != null) {
getProxyBuilder().setVariable(SCRIPT_CLASS_NAME, oldScriptName);
} else {
getProxyBuilder().getVariables().remove(SCRIPT_CLASS_NAME);
}
}
}
public Object eval(final Context context, final Bindings request, final Bindings... scopes)
throws ScriptException {
final Map<String, Object> bindings = mergeBindings(context, request, scopes);
// Bindings so script has access to this environment.
// Only initialize once.
if (null == bindings.get("context")) {
// add context to bindings
// ctx.setAttribute("context", ctx);
// direct output to ctx.getWriter
// If we're wrapping with a PrintWriter here,
// enable autoFlush because otherwise it might not get done!
final Writer writer = engine.getWriter();
bindings.put("out", (writer instanceof PrintWriter) ? writer : new PrintWriter(writer, true));
// Not going to do this after all (at least for now).
// Scripts can use context.{reader, writer, errorWriter}.
// That is a modern version of System.{in, out, err} or
// Console.{reader, writer}().
//
// // New I/O names consistent with ScriptContext and
// java.io.Console.
//
// ctx.setAttribute("writer", writer, ScriptContext.ENGINE_SCOPE);
//
// // Direct errors to ctx.getErrorWriter
// final Writer errorWriter = ctx.getErrorWriter();
// ctx.setAttribute("errorWriter", (errorWriter instanceof
// PrintWriter) ?
// errorWriter :
// new PrintWriter(errorWriter),
// ScriptContext.ENGINE_SCOPE);
//
// // Get input from ctx.getReader
// // We don't wrap with BufferedReader here because we expect that
// if
// // the host wants that they do it. Either way Groovy scripts will
// // always have readLine because the GDK supplies it for Reader.
// ctx.setAttribute("reader", ctx.getReader(),
// ScriptContext.ENGINE_SCOPE);
}
// Fix for GROOVY-3669: Can't use several times the same JSR-223
// ScriptContext for differents groovy script
// if (ctx.getWriter() != null) {
// ctx.setAttribute("out", new PrintWriter(ctx.getWriter(), true),
// DefaultScriptContext.REQUEST_SCOPE);
// }
try {
Script scriptObject = engine.createScript(scriptName, new Binding(bindings));
// create a Map of MethodClosures from this new script object
Method[] methods = scriptObject.getClass().getMethods();
final Map<String, Closure> closures = new HashMap<String, Closure>();
for (Method m : methods) {
String name = m.getName();
closures.put(name, new MethodClosure(scriptObject, name));
}
MetaClass oldMetaClass = scriptObject.getMetaClass();
/*
* We override the MetaClass of this script object so that we can
* forward calls to global closures (of previous or future "eval"
* calls) This gives the illusion of working on the same "global"
* scope.
*/
scriptObject.setMetaClass(
new DelegatingMetaClass(oldMetaClass) {
@Override
public Object invokeMethod(Object object, String name, Object args) {
if (args == null) {
return invokeMethod(object, name, MetaClassHelper.EMPTY_ARRAY);
}
if (args instanceof Tuple) {
return invokeMethod(object, name, ((Tuple) args).toArray());
}
if (args instanceof Object[]) {
return invokeMethod(object, name, (Object[]) args);
} else {
return invokeMethod(object, name, new Object[] {args});
}
}
@Override
public Object invokeMethod(Object object, String name, Object[] args) {
try {
return super.invokeMethod(object, name, args);
} catch (MissingMethodException mme) {
return callGlobal(name, args, bindings);
}
}
@Override
public Object invokeStaticMethod(Object object, String name, Object[] args) {
try {
return super.invokeStaticMethod(object, name, args);
} catch (MissingMethodException mme) {
return callGlobal(name, args, bindings);
}
}
private Object callGlobal(String name, Object[] args, Map<String, Object> ctx) {
Closure closure = closures.get(name);
if (closure != null) {
return closure.call(args);
} else {
// Look for closure valued variable in the
// given ScriptContext. If available, call it.
Object value = ctx.get(name);
if (value instanceof Closure) {
return ((Closure) value).call(args);
} // else fall thru..
}
throw new MissingMethodException(name, getClass(), args);
}
});
try {
return scriptObject.run();
} catch (Exception e) {
throw new ScriptThrownException(e.getMessage(), e);
}
} catch (ScriptException e) {
throw e;
} catch (CompilationFailedException e) {
throw new ScriptCompilationException(e);
} catch (Exception e) {
throw new ScriptException(e);
} finally {
// Fix for GROOVY-3669: Can't use several times the same JSR-223
// ScriptContext for different groovy script
// Groovy's scripting engine implementation adds those two variables
// in the binding
// but should clean up afterwards
// ctx.removeAttribute("context",
// DefaultScriptContext.REQUEST_SCOPE);
// ctx.removeAttribute("out", DefaultScriptContext.REQUEST_SCOPE);
}
}
