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.


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

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            (PropertyDescriptor[]) descriptorsCache.get(beanClass);
  if (descriptors != null)
      return (descriptors);


  // Introspect the bean and cache the generated descriptors
  BeanInfo beanInfo = null;
  try {
      beanInfo = Introspector.getBeanInfo(bean.getClass());
  } catch (IntrospectionException e) {
      return (new PropertyDescriptor[0]);
  }
  descriptors = beanInfo.getPropertyDescriptors();
  if (descriptors == null)
      descriptors = new PropertyDescriptor[0];
        descriptorsCache.put(beanClass, descriptors);
  return (descriptors);

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    }


    private static Map buildBeanClassMap(Class beanClass)
    {
        Map result = new HashMap();
        BeanInfo bi = null;


        try
        {
            bi = Introspector.getBeanInfo(beanClass);
        }
        catch (IntrospectionException ex)
        {
            throw new ApplicationRuntimeException(
                Tapestry.format("PropertyFinder.unable-to-introspect-class", beanClass.getName()),
                ex);
        }


        PropertyDescriptor[] pd = bi.getPropertyDescriptors();


        for (int i = 0; i < pd.length; i++)
        {
            PropertyDescriptor d = pd[i];

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        return result;
    }


    protected Throwable buildDescription(Throwable exception)
    {
        BeanInfo info;
        Class exceptionClass;
        ExceptionProperty property;
        PropertyDescriptor[] descriptors;
        PropertyDescriptor descriptor;
        Throwable next = null;
        int i;
        Object value;
        Method method;
        ExceptionProperty[] properties;
        ExceptionDescription description;
        String stringValue;
        String message;
        String[] stackTrace = null;


        propertyDescriptions.clear();


        message = exception.getMessage();
        exceptionClass = exception.getClass();


        // Get properties, ignoring those in Throwable and higher
        // (including the 'message' property).


        try
        {
            info = Introspector.getBeanInfo(exceptionClass, Throwable.class);
        }
        catch (IntrospectionException e)
        {
            return null;
        }


        descriptors = info.getPropertyDescriptors();


        for (i = 0; i < descriptors.length; i++)
        {
            descriptor = descriptors[i];

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     * specified object.
     */
    public static Object randomizeBean(Object bean)
    throws IntrospectionException, IllegalAccessException,
        InvocationTargetException, java.beans.IntrospectionException {
        BeanInfo info = Introspector.getBeanInfo(bean.getClass());
        PropertyDescriptor[] props = info.getPropertyDescriptors();
        for (int i = 0; i < props.length; i++) {
            Method write = props[i].getWriteMethod();
            if (write == null)
                continue;

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    private void initialise() {
        Class  beanClass = getBean().getClass();
        try {
            //BeanInfo beanInfo = Introspector.getBeanInfo( bean, null );
            BeanInfo beanInfo = Introspector.getBeanInfo( beanClass );
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
            if ( propertyDescriptors != null ) {
                for ( int i = 0; i < propertyDescriptors.length; i++ ) {
                    PropertyDescriptor propertyDescriptor = propertyDescriptors[i];
                    if ( propertyDescriptor != null ) {
                        String name = propertyDescriptor.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
                     */

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      try {
        Class<?> clazz = classLoader.loadClass(realClassName(cls));
        Object o = clazz.newInstance();


        // add any introspected properties
        BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();


        for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
          String name = propertyDescriptor.getName();
          Class<?> type = propertyDescriptor.getPropertyType();
                    if (type == null) {

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     Uses JavaBeans {@link Introspector} to computer setters of object to be
     configured.
   */
  protected void introspect() {
    try {
      BeanInfo bi = Introspector.getBeanInfo(obj.getClass());
      propertyDescriptors = bi.getPropertyDescriptors();
      methodDescriptors = bi.getMethodDescriptors();
    } catch (IntrospectionException ex) {
      getLogger().error(
        "Failed to introspect " + obj + ": " + ex.getMessage());
      propertyDescriptors = new PropertyDescriptor[0];
      methodDescriptors = new MethodDescriptor[0];

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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
                     */

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