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

    private static final String HIBERNATE_LAZY_INITIALIZER_PROP = "hibernateLazyInitializer";
    private static final String IMPLEMENTATION_PROP = "implementation";


    public boolean supports(Object object) {
        if (object == null) return false;
        MetaClass mc = GroovySystem.getMetaClassRegistry().getMetaClass(object.getClass());
        return mc.hasProperty(object, HIBERNATE_LAZY_INITIALIZER_PROP) != null;
    }

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    private Object unwrap(Object o) {
        if (o == null) return o;


        final MetaClassRegistry registry = GroovySystem.getMetaClassRegistry();
        MetaClass mc = registry.getMetaClass(o.getClass());


        final Object hibernateLazyInitializer = mc.getProperty(o, HIBERNATE_LAZY_INITIALIZER_PROP);
        return registry.getMetaClass(hibernateLazyInitializer.getClass()).getProperty(
                hibernateLazyInitializer, IMPLEMENTATION_PROP);
    }

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                new ConverterException("Error invoking toXML method of object with class " + object.getClass().getName(),e);
        }
    }


    protected MetaMethod getToXMLMethod(Object object) {
        MetaClass mc = GroovySystem.getMetaClassRegistry().getMetaClass(object.getClass());
        if (mc != null) {
            return mc.getMetaMethod("toXML", new Object[] { XML.class });
        }
        return null;
    }

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        //set up a map with ERRORS_PROPERTY
        Map map = new HashMap();
        StringWithError value = new StringWithError("flinstone");
        map.put("fred",value);
        map.put("barney","rabble");
        MetaClass mc = GroovySystem.getMetaClassRegistry().getMetaClass(value.getClass());
        mc.setProperty(value, ERRORS_PROPERTY, new Object());


        //put the map to scope
        FlashScope fs = new GrailsFlashScope();
        fs.put("test", "value");
        fs.put("flinstones", map);

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    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static void copyExpandoMetaClass(Class<?> fromClass, Class<?> toClass, boolean removeSource) {


        MetaClassRegistry registry = getRegistry();


        MetaClass oldMetaClass = registry.getMetaClass(fromClass);


        AdaptingMetaClass adapter = null;
        ExpandoMetaClass emc;


        if (oldMetaClass instanceof AdaptingMetaClass) {
            adapter = ((AdaptingMetaClass)oldMetaClass);
            emc = (ExpandoMetaClass)adapter.getAdaptee();
            if (LOG.isDebugEnabled()) {
                LOG.debug("Obtained adapted MetaClass ["+emc+"] from AdapterMetaClass instance ["+adapter+"]");
            }


            if (removeSource) {
                registry.removeMetaClass(fromClass);
            }
        }
        else {
            emc = (ExpandoMetaClass)oldMetaClass;
            if (LOG.isDebugEnabled()) {
                LOG.debug("No adapter MetaClass found, using original ["+emc+"]");
            }
        }


        ExpandoMetaClass replacement = new ExpandoMetaClass(toClass, true, true);


        for (Object obj : emc.getExpandoMethods()) {
            if (obj instanceof ClosureInvokingMethod) {
                ClosureInvokingMethod cim = (ClosureInvokingMethod) obj;
                Closure callable = cim.getClosure();
                if (!cim.isStatic()) {
                    replacement.setProperty(cim.getName(), callable);
                }
                else {
                    ((GroovyObject)replacement.getProperty(ExpandoMetaClass.STATIC_QUALIFIER)).setProperty(cim.getName(),callable);
                }
            }
        }


        for (Object o : emc.getExpandoProperties()) {
            if (o instanceof ThreadManagedMetaBeanProperty) {
                ThreadManagedMetaBeanProperty mbp = (ThreadManagedMetaBeanProperty)o;
                replacement.setProperty(mbp.getName(), mbp.getInitialValue());
            }
        }
        replacement.initialize();


        if (adapter == null) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Adding MetaClass for class ["+toClass+"] MetaClass ["+replacement+"]");
            }
            registry.setMetaClass(toClass, replacement);
        }
        else {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Adding MetaClass for class [" + toClass + "] MetaClass [" + replacement +
                        "] with adapter [" + adapter + "]");
            }
            try {
                Constructor c = adapter.getClass().getConstructor(new Class[]{MetaClass.class});
                MetaClass newAdapter = (MetaClass) BeanUtils.instantiateClass(c,new Object[]{replacement});
                registry.setMetaClass(toClass,newAdapter);
            }
            catch (NoSuchMethodException e) {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Exception thrown constructing new MetaClass adapter when reloading: " + e.getMessage(),e);

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    }


    public static ExpandoMetaClass getExpandoMetaClass(Class<?> aClass) {
        MetaClassRegistry registry = getRegistry();


        MetaClass mc = registry.getMetaClass(aClass);
        if (mc instanceof ExpandoMetaClass) {
            ExpandoMetaClass emc = (ExpandoMetaClass) mc;
            registry.setMetaClass(aClass, emc); // make permanent
            return emc;
        }

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    }


    public static MetaClass getMetaClass(Object instance) {
        if (instance instanceof GroovyObject) {
            GroovyObject groovyObject = (GroovyObject) instance;
            MetaClass metaClass = groovyObject.getMetaClass();
            
            metaClass = unwrapDelegatingMetaClass(metaClass);
            
            if (!(metaClass instanceof ExpandoMetaClass)) {
                metaClass = getExpandoMetaClass(instance.getClass());

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     * @param requiredType The required type of the property
     * @return The property value
     */
    @SuppressWarnings("unchecked")
    public static <T> T getPropertyIfExists(Object instance, String property, Class<T> requiredType) {
        MetaClass metaClass = getMetaClass(instance);


        MetaProperty metaProperty = metaClass.getMetaProperty(property);
        if (metaProperty != null) {
            Object value = metaProperty.getProperty(instance);
            if (value != null && requiredType.isInstance(value)) {
                return (T) value;
            }

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     * @param args The arguments
     *
     * @return The result of the method call or null
     */
    public static Object invokeMethodIfExists(Object instance, String methodName, Object[] args) {
        MetaClass metaClass = getMetaClass(instance);
        List<MetaMethod> methodList = metaClass.respondsTo(instance, methodName, args);
        if (methodList != null && !methodList.isEmpty()) {
            return metaClass.invokeMethod(instance, methodName, args);
        }
        return null;
    }

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        if (args.length > 1 && args[args.length - 1] instanceof Closure) {
            return invokeBeanDefiningMethod(name, args);
        }


        ApplicationContext ctx = springConfig.getUnrefreshedApplicationContext();
        MetaClass mc = DefaultGroovyMethods.getMetaClass(ctx);
        if (!mc.respondsTo(ctx, name, args).isEmpty()) {
            return mc.invokeMethod(ctx,name, args);
        }


        return this;
    }

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