Examples of java.beans.BeanInfo

java.beans.BeanInfo
A bean implementor who wishes to provide explicit information about their bean may provide a BeanInfo class that implements this BeanInfo interface and provides explicit information about the methods, properties, events, etc, of their bean.
A bean implementor doesn't need to provide a complete set of explicit information. You can pick and choose which information you want to provide and the rest will be obtained by automatic analysis using low-level reflection of the bean classes' methods and applying standard design patterns.
You get the opportunity to provide lots and lots of different information as part of the various XyZDescriptor classes. But don't panic, you only really need to provide the minimal core information required by the various constructors.
See also the SimpleBeanInfo class which provides a convenient "noop" base class for BeanInfo classes, which you can override for those specific places where you want to return explicit info.
To learn about all the behaviour of a bean see the Introspector class.

    public void aMethodThatExpectsUUIDExceptionWrapper(UUIDExceptionWrapper exception) {
        this.args = exception;
    }


    public static Method methodFor(String methodName) throws IntrospectionException {
        BeanInfo beanInfo = Introspector.getBeanInfo(SomeSteps.class);
        for (MethodDescriptor md : beanInfo.getMethodDescriptors()) {
            if (md.getMethod().getName().equals(methodName)) {
                return md.getMethod();
            }
        }
        return null;

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        return null;
    }    




    static Method stepMethodFor(String methodName, Class<? extends Steps> stepsClass) throws IntrospectionException {
        BeanInfo beanInfo = Introspector.getBeanInfo(stepsClass);
        for (MethodDescriptor md : beanInfo.getMethodDescriptors()) {
            if (md.getMethod().getName().equals(methodName)) {
                return md.getMethod();
            }
        }
        return null;

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            return resolveType(readMethod.getGenericReturnType());
        }


        private PropertyDescriptor getPropertyDescriptor(String propertyName) {
            BeanInfo beanInfo = null;
            try {
                beanInfo = Introspector.getBeanInfo(beanClass);
            } catch (IntrospectionException e) {
                throw new FacesException(e.getMessage(), e);
            } finally {
                Introspector.flushFromCaches(beanClass);
            }


            if (beanInfo == null) {
                return null;
            }


            PropertyDescriptor[] propertyDescriptorsArray = beanInfo.getPropertyDescriptors();
            for (PropertyDescriptor pd : propertyDescriptorsArray) {
                if (propertyName.equals(pd.getName())) {
                    return pd;
                }
            }

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        jso.put("_name", theEnum.name());


        if (ser.getMarshallClassHints())
          jso.put("javaClass", theEnum.getClass().getName());


        BeanInfo info = Introspector.getBeanInfo(clazz);
        PropertyDescriptor props[] = info.getPropertyDescriptors();


        for (PropertyDescriptor prop : props) {
          if ("declaringClass".equals(prop.getName())
              || "class".equals(prop.getName()))
            continue;

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         * Obtain a reference to the composite component metadata for this composite component by calling
         * ViewDeclarationLanguage.getComponentMetadata(javax.faces.context.FacesContext,
         * javax.faces.application.Resource), passing the facesContext and componentResource arguments to this method.
         * This version of JSF specification uses JavaBeans as the API to the component metadata.
         */
        BeanInfo metadata = vdl.getComponentMetadata(context, componentResource);


        /*
         * Determine if the component author declared a component-type for this component instance by obtaining the
         * BeanDescriptor from the component metadata and calling its getValue() method, passing
         * UIComponent.COMPOSITE_COMPONENT_TYPE_KEY as the argument. If non-null, the result must be a ValueExpression
         * whose value is the component-type of the UIComponent to be created for this Resource component. Call through
         * to createComponent(java.lang.String) to create the component.
         */
        BeanDescriptor descriptor = metadata.getBeanDescriptor();
        ValueExpression componentType = (ValueExpression) descriptor.getValue(UIComponent.COMPOSITE_COMPONENT_TYPE_KEY);


        if (componentType != null)
        {
            component = createComponent((String) componentType.getValue(context.getELContext()));

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    private static void _writeAttributes(Writer writer, UIComponent c)
    {
        try
        {
            BeanInfo info = Introspector.getBeanInfo(c.getClass());
            PropertyDescriptor[] pd = info.getPropertyDescriptors();
            Method m = null;
            Object v = null;
            String str = null;
            for (int i = 0; i < pd.length; i++)
            {

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     * {@inheritDoc}
     */
    @Override
    public BeanInfo getComponentMetadata(FacesContext context, Resource componentResource)
    {
        BeanInfo beanInfo = null;
        
        try 
        {
            Facelet compositeComponentFacelet;
            FaceletFactory.setInstance(_faceletFactory);

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    @Override
    @SuppressWarnings("unchecked")
    public void retargetAttachedObjects(FacesContext context,
            UIComponent topLevelComponent, List<AttachedObjectHandler> handlerList)
    {
        BeanInfo compositeComponentMetadata = (BeanInfo) topLevelComponent.getAttributes().get(UIComponent.BEANINFO_KEY);
        
        if (compositeComponentMetadata == null)
        {
            log.severe("Composite component metadata not found for: "+topLevelComponent.getClientId());
            return;
        }
        
        BeanDescriptor compositeComponentDescriptor = compositeComponentMetadata.getBeanDescriptor();
        
        List<AttachedObjectTarget> targetList = (List<AttachedObjectTarget>) 
            compositeComponentDescriptor.getValue(AttachedObjectTarget.ATTACHED_OBJECT_TARGETS_KEY);
        
        if (targetList == null || targetList.isEmpty())

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    @Override
    public void retargetMethodExpressions(FacesContext context,
            UIComponent topLevelComponent)
    {
        BeanInfo compositeComponentMetadata = (BeanInfo) topLevelComponent.getAttributes().get(UIComponent.BEANINFO_KEY);
        
        if (compositeComponentMetadata == null)
        {
            log.severe("Composite component metadata not found for: "+topLevelComponent.getClientId());
            return;
        }


        // "...For each attribute that is a MethodExpression..." This means we have to scan
        // all attributes with "method-signature" attribute and no "type" attribute
        // javax.faces.component._ComponentAttributesMap uses BeanInfo.getPropertyDescriptors to
        // traverse over it, but here the metadata returned by UIComponent.BEANINFO_KEY is available
        // only for composite components.
        // That means somewhere we need to create a custom BeanInfo object for composite components
        // that will be filled somewhere (theorically in ViewDeclarationLanguage.getComponentMetadata())
        
        PropertyDescriptor[] propertyDescriptors = compositeComponentMetadata.getPropertyDescriptors();
        
        for (PropertyDescriptor propertyDescriptor : propertyDescriptors)
        {
            if (propertyDescriptor.getValue("type") != null)
            {

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        // Unfortunately, we can't check it on constructor because we need to call
        // ViewDeclarationLanguage.getComponentMetadata() and on that point it is possible to not
        // have a viewId.
        if (!facesContext.isProjectStage(ProjectStage.Production))
        {
            BeanInfo beanInfo = (BeanInfo) component.getAttributes().get(UIComponent.BEANINFO_KEY);
            for (PropertyDescriptor propertyDescriptor : beanInfo.getPropertyDescriptors())
            {
                ValueExpression ve = (ValueExpression) propertyDescriptor.getValue("required");
                if (ve != null)
                {
                    // QUESTION: Almost positive that the value expression is supposed to evaluate to a boolean, but originally

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