Examples of groovy.lang.MetaClass

groovy.lang.MetaClass
A MetaClass within Groovy defines the behaviour of any given Groovy or Java class. The MetaClass interface defines two parts. The client API, which is defined via the extend MetaObjectProtocol interface and the contract with the Groovy runtime system. In general the compiler and Groovy runtime engine interact with methods on this class whilst MetaClass clients interact with the method defined by the MetaObjectProtocol interface @see MetaClassImpl @see groovy.lang.MetaObjectProtocol @author John Wilson @author Graeme Rocher


        GroovyObject object = (GroovyObject) groovyClass.newInstance();


        assertTrue(object != null);


        MetaClass metaClass = object.getMetaClass();
        System.out.println("Metaclass: " + metaClass);


        Class type = object.getClass();
        System.out.println("Type: " + type);


        // invoke via metaclass
        metaClass.invokeMethod(object, "main", null);


        // invoke directly
        object.invokeMethod("main", null);
    }

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     * Get info about instance and class Methods that are dynamically added through Groovy.
     *
     * @return Array of StringArrays that can be indexed with the MEMBER_xxx_IDX constants
     */
    public Object[] getMetaMethods() {
        MetaClass metaClass = InvokerHelper.getMetaClass(objectUnderInspection);
        List metaMethods = metaClass.getMetaMethods();
        Object[] result = new Object[metaMethods.size()];
        int i = 0;
        for (Iterator iter = metaMethods.iterator(); iter.hasNext(); i++) {
            MetaMethod metaMethod = (MetaMethod) iter.next();
            result[i] = methodInfo(metaMethod);

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            this.parent().children().add(child);
        }
    }


    protected static void setMetaClass(final MetaClass metaClass, Class nodeClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            @Override
            public Object getAttribute(final Object object, final String attribute) {
                Node n = (Node) object;
                return n.get("@" + attribute);
            }

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    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);
        return script.run();
    }

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                }


                // save all current closures into global closures map
                globalClosures.putAll(closures);


                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.

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public class JO {
    public static SoftReference staticMetaClass;


    MetaClass getStaticMetaClass (Object obj) {
        MetaClass mc;
        if (staticMetaClass == null || (mc = (MetaClass) staticMetaClass.get()) == null ) {
            mc = InvokerHelper.getMetaClass(obj);
            staticMetaClass = new SoftReference(mc);
        }
        return mc;

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        return createCallConstructorSite(callSite, (Class) receiver, args).callConstructor(receiver, args);
    }


    private static CallSite createCallStaticSite(CallSite callSite, Class receiver, Object[] args) {
        CallSite site;
        MetaClass metaClass = InvokerHelper.getMetaClass(receiver);
        if (metaClass instanceof MetaClassImpl) {
            site = ((MetaClassImpl)metaClass).createStaticSite(callSite, args);
        }
        else
          site = new StaticMetaClassSite(callSite, metaClass);

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        replaceCallSite(callSite, site);
        return site;
    }


    private static CallSite createCallConstructorSite(CallSite callSite, Class receiver, Object[] args) {
       MetaClass metaClass = InvokerHelper.getMetaClass(receiver);


       CallSite site;
       if (metaClass instanceof MetaClassImpl) {
           site = ((MetaClassImpl)metaClass).createConstructorSite(callSite, args);
       }

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    private static CallSite createCallCurrentSite(CallSite callSite, GroovyObject receiver, Object[] args, Class sender) {
        CallSite site;
        if (receiver instanceof GroovyInterceptable)
          site = new PogoInterceptableSite(callSite);
        else {
            MetaClass metaClass = receiver.getMetaClass();
            if (receiver.getClass() != metaClass.getTheClass() && !metaClass.getTheClass().isInterface()) {
                site = new PogoInterceptableSite(callSite);
            }
            else
                if (metaClass instanceof MetaClassImpl) {
                    site = ((MetaClassImpl)metaClass).createPogoCallCurrentSite(callSite, sender, args);

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    // for MetaClassImpl we try to pick meta method,
    // otherwise or if method doesn't exist we make call via POJO meta class
    private static CallSite createPojoSite(CallSite callSite, Object receiver, Object[] args) {
        final Class klazz = receiver.getClass();
        MetaClass metaClass = InvokerHelper.getMetaClass(receiver);
        if (callSite.getUsage().get() == 0 && metaClass instanceof MetaClassImpl) {
            final MetaClassImpl mci = (MetaClassImpl) metaClass;
            final ClassInfo info = mci.getTheCachedClass().classInfo;
            if (info.hasPerInstanceMetaClasses()) {
                return new PerInstancePojoMetaClassSite(callSite, info);

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