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 CallSite createPogoSite(CallSite callSite, Object receiver, Object[] args) {
        if (receiver instanceof GroovyInterceptable)
          return new PogoInterceptableSite(callSite);


        MetaClass metaClass = ((GroovyObject)receiver).getMetaClass();


        if (metaClass instanceof MetaClassImpl) {
            return ((MetaClassImpl)metaClass).createPogoCallSite(callSite, args);
        }

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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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        setMetaClass(getMetaClass()); // wrap the standard MetaClass with the delegate
    }


    @Override
    public void setMetaClass(final MetaClass metaClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            @Override
            public Object getAttribute(final Object object, final String attribute) {
                return GPathResult.this.getProperty("@" + 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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    public NodeList(int size) {
        super(size);
    }


    protected static void setMetaClass(final Class nodelistClass, final MetaClass metaClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            @Override
            public Object getAttribute(final Object object, final String attribute) {
                NodeList nl = (NodeList) object;
                Iterator it = nl.iterator();
                List result = new ArrayList();

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  private static final long serialVersionUID = -6048626637734368371L;


  public TextReport<?> buildReport(Resource resource) throws Exception {
    GroovyClassLoader gcl = new GroovyClassLoader();


    MetaClass metaClass = new LineMetaClass();
    GroovySystem.getMetaClassRegistry().setMetaClass(BasicLine.class, metaClass);


    Class<?> clazz = gcl.parseClass(resource.getInputStream());
    return (TextReport<?>) clazz.newInstance();
  }

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    /* (non-Javadoc)
     * @see groovy.lang.GroovyObjectSupport#setMetaClass(groovy.lang.MetaClass)
     */
    public void setMetaClass(final MetaClass metaClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            /* (non-Javadoc)
            * @see groovy.lang.DelegatingMetaClass#getAttribute(java.lang.Object, java.lang.String)
            */
            public Object getAttribute(final Object object, final String attribute) {
                return GPathResult.this.getProperty("@" + attribute);

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    public Node appendNode(Object name, Map attributes, Object value) {
        return new Node(this, name, attributes, value);
    }


    private static void setMetaClass(final MetaClass metaClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            /* (non-Javadoc)
            * @see groovy.lang.DelegatingMetaClass#getAttribute(java.lang.Object, java.lang.String)
            */
            public Object getAttribute(final Object object, final String attribute) {
                Node n = (Node) object;

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    public NodeList(int size) {
        super(size);
    }


    private static void setMetaClass(final MetaClass metaClass) {
        final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {
            /* (non-Javadoc)
            * @see groovy.lang.DelegatingMetaClass#getAttribute(java.lang.Object, java.lang.String)
            */
            public Object getAttribute(final Object object, final String attribute) {
                NodeList nl = (NodeList) object;

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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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