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.

            this.tagHandlerClass = tagHandlerClass;
            this.methodMaps = new Hashtable();
            this.propertyEditorMaps = new Hashtable();


            try {
                BeanInfo tagClassInfo = Introspector
                        .getBeanInfo(tagHandlerClass);
                PropertyDescriptor[] pd = tagClassInfo.getPropertyDescriptors();
                for (int i = 0; i < pd.length; i++) {
                    /*
                     * FIXME: should probably be checking for things like
                     * pageContext, bodyContent, and parent here -akv
                     */

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    private static ClassAdaptor buildClassAdaptor(Object target, Class targetClass)
    {
        try
        {
            BeanInfo info = Introspector.getBeanInfo(targetClass);


            return new ClassAdaptor(info.getPropertyDescriptors());
        }
        catch (Exception ex)
        {
            throw new ApplicationRuntimeException(
                UtilMessages.unableToIntrospect(targetClass, ex),

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        } catch (Exception e) {
            throw new DeploymentException("Could not create java bean instance", e);
        }
        PropertyDescriptor[] propertyDescriptors;
        try {
            BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
            propertyDescriptors = beanInfo.getPropertyDescriptors();
        } catch (IntrospectionException e) {
            throw new DeploymentException("Could not analyze java bean class", e);
        }


        PropertyType[] properties = javabean.getPropertyArray();

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      try
      {
        Class<?> objClass = _getClass();
        // Grab all the getters and setters using JavaBeans
        BeanInfo info = JavaIntrospector.getBeanInfo(objClass);
        PropertyDescriptor[] descriptors = info.getPropertyDescriptors();


        int length = (descriptors != null) ? descriptors.length : 0;
        defs = new HashMap<String, PropertyDef>(Math.max(length, 1));
        _defs = defs;

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      writers = new HashMap<String, PropertyWriter>();


      try
      {
        // Grab all the "getters" using JavaBeans
        BeanInfo info = JavaIntrospector.getBeanInfo(objClass);
        PropertyDescriptor[] descriptors = info.getPropertyDescriptors();
        if (descriptors != null)
        {
          for (int i = 0; i < descriptors.length; i++)
          {
            String name   = descriptors[i].getName();

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            this.tagHandlerClass = tagHandlerClass;
            this.methodMaps = new Hashtable<>();
            this.propertyEditorMaps = new Hashtable<>();


            try {
                BeanInfo tagClassInfo = Introspector
                        .getBeanInfo(tagHandlerClass);
                PropertyDescriptor[] pd = tagClassInfo.getPropertyDescriptors();
                for (int i = 0; i < pd.length; i++) {
                    /*
                     * FIXME: should probably be checking for things like
                     * pageContext, bodyContent, and parent here -akv
                     */

View Full Code Here

     * {@inheritDoc}
     */
    @Override
    public BeanInfo getComponentMetadata(FacesContext context, Resource componentResource)
    {
        BeanInfo beanInfo = null;


        checkNull(context, "context");


        try
        {

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    {
        checkNull(context, "context");
        checkNull(topLevelComponent, "topLevelComponent");
        checkNull(handlerList, "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)
    {
        checkNull(context, "context");


        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();


        ELContext elContext = (ELContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);


        for (PropertyDescriptor propertyDescriptor : propertyDescriptors)
        {

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    private boolean isCompositeComponentRetarget(FacesContext context, UIComponent component, String attributeName)
    {
        if (UIComponent.isCompositeComponent(component))
        {
            BeanInfo compositeComponentMetadata = (BeanInfo) component.getAttributes().get(UIComponent.BEANINFO_KEY);


            PropertyDescriptor[] propertyDescriptors = compositeComponentMetadata.getPropertyDescriptors();


            ELContext elContext = (ELContext) context.getAttributes().get(FaceletContext.FACELET_CONTEXT_KEY);


            for (PropertyDescriptor propertyDescriptor : propertyDescriptors)
            {

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