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

  public void applyAttributes(GroovyBuilder builder, ObjectFactoryInterceptor ofi, String nodeName, Object instance, Map<Object, Object> attributes) {
    if (attributes == null) return;
    if (instance instanceof SelfAttributeApplicator) {
      ((SelfAttributeApplicator)instance).applyAttributes(attributes);
    } else {
      MetaClass mc = ofi.getMetaClassForNode(nodeName);
      if (mc.getTheClass() != instance.getClass()) mc = InvokerHelper.getMetaClass(instance.getClass());
      for (Object key : attributes.keySet()) {
        MetaProperty prop = mc.getMetaProperty(String.valueOf(key));
        if (prop == null) {
          try { 
            Field field = mc.getTheClass().getField(String.valueOf(key));
            field.set(instance, attributes.get(key));
          } 
          catch (SecurityException e) {} 
          catch (NoSuchFieldException e) {}
          catch (IllegalAccessException e) {}

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   * 
   * @see ObjectFactoryInterceptor#isPassParentToConstructor()
   */
  public void associate(GroovyBuilder builder, ObjectFactoryInterceptor ofi, Object child, Object parent) {
    if (parent != null) {
      MetaClass pmc = InvokerHelper.getMetaClass(child.getClass());
      pmc.invokeMethod(parent, "addChild", new Object[] { parent });
    }
    
    MetaClass cmc = InvokerHelper.getMetaClass(child.getClass());
    cmc.invokeMethod(child, "setParent", new Object[] { parent });
  }

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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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    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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    public void addListeners(PropertyChangeListener listener, Object newObject, Set updateSet) {
        removeListeners();
        if (newObject != null) {
            // check for local synthetics
            TriggerBinding syntheticTrigger = getSyntheticTriggerBinding(newObject);
            MetaClass mc = InvokerHelper.getMetaClass(newObject);
            if (syntheticTrigger != null) {
                PropertyBinding psb = new PropertyBinding(newObject, propertyName);
                PropertyChangeProxyTargetBinding proxytb = new PropertyChangeProxyTargetBinding(newObject, propertyName, listener);


                syntheticFullBinding = syntheticTrigger.createBinding(psb, proxytb);
                syntheticFullBinding.bind();
                updateSet.add(newObject);
            } else if (!mc.respondsTo(newObject, "addPropertyChangeListener", NAME_PARAMS).isEmpty()) {
                InvokerHelper.invokeMethod(newObject, "addPropertyChangeListener", new Object[] {propertyName, listener});
                localListener = listener;
                updateSet.add(newObject);
            } else if (!mc.respondsTo(newObject, "addPropertyChangeListener", GLOBAL_PARAMS).isEmpty()) {
                InvokerHelper.invokeMethod(newObject, "addPropertyChangeListener", listener);
                globalListener = listener;
                updateSet.add(newObject);
            }
        }

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        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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            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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        final String typeName = field.getClass().getName();
        throw new RuntimeException(createErrorMessage(className, fieldName, typeName, "constructing"));
    }


    public static void checkPropNames(Object instance, Map<String, Object> args) {
        final MetaClass metaClass = InvokerHelper.getMetaClass(instance);
        for (String k : args.keySet()) {
            if (metaClass.hasProperty(instance, k) == null)
                throw new MissingPropertyException(k, instance.getClass());
        }
    }

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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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        for (Class categoryClass : categoryClasses) {


            final CachedClass cachedCategoryClass = ReflectionCache.getCachedClass(categoryClass);
            final MixinInMetaClass mixin = new MixinInMetaClass(mc, cachedCategoryClass);


            final MetaClass metaClass = GroovySystem.getMetaClassRegistry().getMetaClass(categoryClass);
            final List<MetaProperty> propList = metaClass.getProperties();
            for (MetaProperty prop : propList)
                if (self.getMetaProperty(prop.getName()) == null) {
                    mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin));
                }


            for (MetaProperty prop : cachedCategoryClass.getFields())
                if (self.getMetaProperty(prop.getName()) == null) {
                    mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin));
                }


            for (MetaMethod method : metaClass.getMethods()) {
                final int mod = method.getModifiers();


                if (!Modifier.isPublic(mod))
                    continue;

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