java.beans

Interface BeanInfo

Table des matières
  • All Known Subinterfaces:
    BeanContextServiceProviderBeanInfo
    All Known Implementing Classes:
    SimpleBeanInfo

    public interface 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.

    • Field Detail

      • ICON_COLOR_16x16

        static final int ICON_COLOR_16x16
        Constant to indicate a 16 x 16 color icon.
        See Also:
        Constant Field Values

      • ICON_COLOR_32x32

        static final int ICON_COLOR_32x32
        Constant to indicate a 32 x 32 color icon.
        See Also:
        Constant Field Values

      • ICON_MONO_16x16

        static final int ICON_MONO_16x16
        Constant to indicate a 16 x 16 monochrome icon.
        See Also:
        Constant Field Values

      • ICON_MONO_32x32

        static final int ICON_MONO_32x32
        Constant to indicate a 32 x 32 monochrome icon.
        See Also:
        Constant Field Values

    • Method Detail

      • getBeanDescriptor

        BeanDescriptor getBeanDescriptor()
        Gets the beans BeanDescriptor.
        Returns:
        A BeanDescriptor providing overall information about the bean, such as its displayName, its customizer, etc. May return null if the information should be obtained by automatic analysis.

      • getEventSetDescriptors

        EventSetDescriptor[] getEventSetDescriptors()
        Gets the beans EventSetDescriptors.
        Returns:
        An array of EventSetDescriptors describing the kinds of events fired by this bean. May return null if the information should be obtained by automatic analysis.

      • getDefaultEventIndex

        int getDefaultEventIndex()
        A bean may have a "default" event that is the event that will mostly commonly be used by humans when using the bean.
        Returns:
        Index of default event in the EventSetDescriptor array returned by getEventSetDescriptors.

        Returns -1 if there is no default event.

      • getPropertyDescriptors

        PropertyDescriptor[] getPropertyDescriptors()
        Returns descriptors for all properties of the bean. May return null if the information should be obtained by automatic analysis.

        If a property is indexed, then its entry in the result array will belong to the IndexedPropertyDescriptor subclass of the PropertyDescriptor class. A client of the getPropertyDescriptors method can use "instanceof" to check whether a given PropertyDescriptor is an IndexedPropertyDescriptor.

        Returns:
        an array of PropertyDescriptors describing all properties supported by the bean or null

      • getDefaultPropertyIndex

        int getDefaultPropertyIndex()
        A bean may have a "default" property that is the property that will mostly commonly be initially chosen for update by human's who are customizing the bean.
        Returns:
        Index of default property in the PropertyDescriptor array returned by getPropertyDescriptors.

        Returns -1 if there is no default property.

      • getMethodDescriptors

        MethodDescriptor[] getMethodDescriptors()
        Gets the beans MethodDescriptors.
        Returns:
        An array of MethodDescriptors describing the externally visible methods supported by this bean. May return null if the information should be obtained by automatic analysis.

      • getAdditionalBeanInfo

        BeanInfo[] getAdditionalBeanInfo()
        This method allows a BeanInfo object to return an arbitrary collection of other BeanInfo objects that provide additional information on the current bean.

        If there are conflicts or overlaps between the information provided by different BeanInfo objects, then the current BeanInfo takes precedence over the getAdditionalBeanInfo objects, and later elements in the array take precedence over earlier ones.

        Returns:
        an array of BeanInfo objects. May return null.

      • getIcon

        Image getIcon(int iconKind)
        This method returns an image object that can be used to represent the bean in toolboxes, toolbars, etc. Icon images will typically be GIFs, but may in future include other formats.

        Beans aren't required to provide icons and may return null from this method.

        There are four possible flavors of icons (16x16 color, 32x32 color, 16x16 mono, 32x32 mono). If a bean choses to only support a single icon we recommend supporting 16x16 color.

        We recommend that icons have a "transparent" background so they can be rendered onto an existing background.

        Parameters:
        iconKind - The kind of icon requested. This should be one of the constant values ICON_COLOR_16x16, ICON_COLOR_32x32, ICON_MONO_16x16, or ICON_MONO_32x32.
        Returns:
        An image object representing the requested icon. May return null if no suitable icon is available.

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Document créé le 29/08/2006, dernière modification le 04/03/2020
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