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.

        }
        
        // HACK: comp.getAttributes() only returns attributes, that are NOT backed
        // by a corresponding component property. So, we must explicitly get the
        // available properties by Introspection:
        BeanInfo beanInfo;
        try
        {
            beanInfo = Introspector.getBeanInfo(comp.getClass());
        }
        catch (IntrospectionException e)
        {
            throw new RuntimeException(e);
        }


        if (!compType.startsWith("org.apache.myfaces.view.facelets.compiler"))
        {
            PropertyDescriptor propDescriptors[] = beanInfo.getPropertyDescriptors();
            for (int i = 0; i < propDescriptors.length; i++)
            {
                if (propDescriptors[i].getReadMethod() != null)
                {
                    String name = propDescriptors[i].getName();

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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);
        if (metadata == null)
        {
            throw new FacesException("Could not get component metadata for " 
                    + componentResource.getResourceName()
                    + ". Did you forget to specify <composite:interface>?");
        }


        /*
         * 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);
        boolean annotationsApplied = false;
        if (componentType != null)
        {
            component = application.createComponent((String) componentType.getValue(context.getELContext()));

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                        _isCompositeComponent = getUnderlyingMap().containsKey(Resource.COMPONENT_RESOURCE_KEY);
                        _isCompositeComponentSet = true;
                    }
                    if (_isCompositeComponent)
                    {
                        BeanInfo ccBeanInfo = (BeanInfo) getUnderlyingMap().get(UIComponent.BEANINFO_KEY);
                        if (ccBeanInfo != null)
                        {
                            for (PropertyDescriptor attribute : ccBeanInfo.getPropertyDescriptors())
                            {
                                if (attribute.getName().equals(key))
                                {
                                    String attributeName = attribute.getName();
                                    boolean isKnownMethod = "action".equals(attributeName)

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            _propertyDescriptorMap = propertyDescriptorCache.get(_component.getClass());
            // Cache miss: create descriptor map and put it in cache
            if (_propertyDescriptorMap == null)
            {
                // Create descriptor map...
                BeanInfo beanInfo;
                try
                {
                    beanInfo = Introspector.getBeanInfo(_component.getClass());
                }
                catch (IntrospectionException e)
                {
                    throw new FacesException(e);
                }
                PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
                _propertyDescriptorMap = new HashMap<String, _PropertyDescriptorHolder>();
                for (int i = 0; i < propertyDescriptors.length; i++)
                {
                    PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
                    Method readMethod = propertyDescriptor.getReadMethod();

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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)
                {
                    Object value = ve.getValue (facesContext.getELContext());

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            Class<?> type = instance.getClass();
            if (_mapper == null || !_lastType.equals(type))
            {
                _lastType = type;
                BeanInfo beanInfo = (BeanInfo)component.getAttributes().get(UIComponent.BEANINFO_KEY);
                _mapper = createMetaRuleset(type , beanInfo).finish();
            }
            
            _mapper.applyMetadata(ctx, instance);
        }

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


    try {
      BeanInfo info = Introspector.getBeanInfo(base.getClass());
      PropertyDescriptor[] pds = info.getPropertyDescriptors();
      for (int i = 0; i < pds.length; i++) {
        pds[i].setValue(RESOLVABLE_AT_DESIGN_TIME, Boolean.TRUE);
        pds[i].setValue(TYPE, pds[i].getPropertyType());
      }
      return Arrays.asList((FeatureDescriptor[]) pds).iterator();

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    public BeanProperties(Class<?> type) throws ELException {
      this.type = type;
      this.properties = new HashMap<String, BeanProperty>();
      try {
        BeanInfo info = Introspector.getBeanInfo(this.type);
        PropertyDescriptor[] pds = info.getPropertyDescriptors();
        for (int i = 0; i < pds.length; i++) {
          this.properties.put(pds[i].getName(), new BeanProperty(
              type, pds[i]));
        }
      } catch (IntrospectionException ie) {

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        Class beanClass = getBeanClass();
        Set processedProperties = getProcessedPropertyNameSet();
        if ( beanClass != null ) {
            try {
                boolean attributesForPrimitives = getXMLInfoDigester().isAttributesForPrimitives();
                BeanInfo beanInfo = Introspector.getBeanInfo( beanClass );
                PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
                if ( descriptors != null ) {
                    for ( int i = 0, size = descriptors.length; i < size; i++ ) {
                        PropertyDescriptor descriptor = descriptors[i];
                        // have we already created a property for this
                        String propertyName = descriptor.getName();

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     * Sub is IndexedPropertyDescriptor, Super is PropertyDescriptor sub set,
     * indexed get. Super get
     */
    public void testIntrospection_7() throws IntrospectionException {
        Class<FakeFox501> beanClass = FakeFox501.class;
        BeanInfo info = Introspector.getBeanInfo(beanClass);
        PropertyDescriptor[] propertyDesc;
        
        assertEquals(0, info.getEventSetDescriptors().length);
        assertEquals(12, info.getMethodDescriptors().length);


        propertyDesc = info.getPropertyDescriptors();
        assertEquals(2, propertyDesc.length);


        for (PropertyDescriptor element : propertyDesc) {
            if (element.getName().equals("class")) {
                assertNull(element.getWriteMethod());

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