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.

      throws BeanException {
      PropertyDescriptor[] result = null;


      try {
         if (fromBean != null) {
            BeanInfo beanInfo = Introspector.getBeanInfo(fromBean.getClass());


            result = beanInfo.getPropertyDescriptors();
         }
      } catch (IntrospectionException e) {
         String type = "null"; //$NON-NLS-1$
         if ( fromBean != null ) {
            type = fromBean.getClass().getName();

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        if ( bean != null)
        {
            try
            {
                Map out = new HashMap();
                BeanInfo beanInfo = Introspector.getBeanInfo( bean.getClass(), Object.class ); //so we don't see getClass() as a property
                PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
                //System.err.println("ignoreProps: " + ignoreProps );
                for( int i = 0, len = pds.length; i < len; ++i)
                {
                    PropertyDescriptor pd = pds[i];

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        // In some race conditions, we may hit this method for the same class multiple times.
        // We just let it happen, replacing the old ClassPropertyAdapter with a new one.


        try
        {
            BeanInfo info = Introspector.getBeanInfo(forClass);


            List<PropertyDescriptor> descriptors = CollectionFactory.newList();


            addAll(descriptors, info.getPropertyDescriptors());


            if (forClass.isInterface())
                addPropertiesFromExtendedInterfaces(forClass, descriptors);


            addPropertiesFromScala(forClass, descriptors);

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        while (!queue.isEmpty())
        {
            Class c = queue.removeFirst();


            BeanInfo info = Introspector.getBeanInfo(c);


            addAll(descriptors, info.getPropertyDescriptors());
            addAll(queue, c.getInterfaces());
        }
    }

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     * {@inheritDoc}
     */
    public void buildMetaBean(MetaBean meta) throws Exception {
        if(meta.getBeanClass() == null) return; // handle only, when local class exists


        BeanInfo info = Introspector.getBeanInfo(meta.getBeanClass());
        if (info.getBeanDescriptor() != null) {
            meta.setName(
                  info.getBeanDescriptor().getName()); // (display?)name = simple class name!
        }
        for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
            if (!(pd instanceof IndexedPropertyDescriptor || pd.getName().equals("class"))) {
                MetaProperty metaProp = buildMetaProperty(pd);
                meta.putProperty(pd.getName(), metaProp);
            }
        }

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    }


    public PropertyDescriptor[] getPropertyDescriptors() {
        if (propertyDescriptors == null) {
            try {
                BeanInfo bi = null;
                if (clazz.isInterface()) {
                    bi = Introspector.getBeanInfo(clazz);
                }
                else {
                    bi = Introspector.getBeanInfo(clazz, Object.class);
                }
                PropertyDescriptor[] pds = bi.getPropertyDescriptors();
                propertyDescriptors = new PropertyDescriptor[pds.length];
                System.arraycopy(pds, 0, propertyDescriptors, 0, pds.length);
                Arrays.sort(propertyDescriptors, new Comparator() {
                    public int compare(Object left, Object right) {
                        return ((PropertyDescriptor) left).getName().compareTo(

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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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    private PropertyDescriptor descriptor(Class clazz, String name)
    {


        System.err.println("descriptor(class=" + clazz.getName() + ", name="
                + name);
        BeanInfo info = null;
        try
        {
            info = Introspector.getBeanInfo(clazz);
            System.err.println("  Found BeanInfo " + info);
        }
        catch (IntrospectionException e)
        {
            throw new EvaluationException(e);
        }
        PropertyDescriptor[] descriptors = info.getPropertyDescriptors();
        for (int i = 0; i < descriptors.length; i++)
        {
            if (name.equals(descriptors[i].getName()))
            {
                System.err

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  private static PropertyDescriptor getPropertyDescriptor(Class<?> type, String propertyName) {


    try {


      BeanInfo info = Introspector.getBeanInfo(type);


      for (PropertyDescriptor descriptor : info.getPropertyDescriptors()) {
        if (descriptor.getName().equals(propertyName)) {
          return descriptor;
        }
      }

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    public Date convertDate(String value) throws ParseException {
        return new SimpleDateFormat("dd/MM/yyyy").parse(value);
    }


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

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