One or more embodiments of the invention provide Common Desktop Environment. a JavaBean Activation Framework. Objects to Implement Shared. Javax.activation Class MailcapCommandMap. The command implementation is specified by a fully qualified class name of a JavaBean(tm). the CommandInfo objects.
The DataContentHandler interface is implemented by objects that can be used to. The DataSource interface provides the JavaBeans Activation Framework with an. REST easy with the JavaBeans Activation Framework. More like this. REST for Java developers, Part 1: It's about the information. Java 101: Classes and objects in.
The JavaBeans API provides a framework for. are the Java Activation Framework and. in the form of FeatureDescriptor objects. In computer programming, JavaBeans Activation Framework, or JAF. An abstract class provides an interface to a registry of command objects available in the system.
Java. Beans (Java in a Nutshell). The Java. Beans API provides a framework for defining reusable. The Java. Beans. specification includes the following definition of a bean: "a. As you can see, this is a rather loose definition. The most common use of beans is for graphical user interface. Java Foundation Classes in a Nutshell. O'Reilly).. Although all beans can be manipulated visually, this does not mean.
For example, the. Row. Set class (documented in. Java Enterprise in a Nutshell (O'Reilly)). Java. Beans component. There are. no limits on the simplicity or complexity of a Java. Beans component. The.
Button object. But even. One of the goals of the Java. Beans model is interoperability with.
So, for example, a native Windows. Java. Beans component.
COM or Active. X component. The details of. this sort of interoperability are beyond the scope of this chapter.
The Java. Beans component model consists of the. API conventions to which conforming beans and bean- manipulation tools must adhere. Because Java. Beans is a. Java. Beans conventions are, in.
API. Two interesting technologies related to Java. Beans are the Java. Activation Framework and Info. Bus. Both are standard extensions.
You can read more about. Java. Beans web site. Beans can be used at three levels by three different. If you are writing an application that uses beans developed by. Java. Beans concepts and terminology. You also need to read the documentation for the individual beans. Java. Beans API. This chapter begins with an.
Java. Beans concepts that should be sufficient for. If you are writing beans, you need to understand and. Java. Beans naming and packaging conventions. After the introduction to general bean concepts and. Although a Java. Beans component. Java. Beans API, most.
These auxiliary. classes rely heavily on the Java. Beans API so that they can. If you are developing a GUI editor, application builder, or. Java. Beans API to help you. You also need to be. Java. Beans. programming conventions. Although this chapter describes the.
Java. Beans specification (see. Any object that conforms to certain. Bean class. all beans are required to subclass. Many beans are AWT. Just because a bean does not have an onscreen. A bean is characterized by the properties, events, and methods it.
It is these properties, events, and methods an. A property is a piece of the bean's internal state.
A bean communicates with the application in which it is embedded. The Java. Beans API uses the same event model AWT and Swing. This model is based on the.
Event. Object class and the. Event. Listener interface; it is.
Java Foundation Classes in a. Nutshell (O'Reilly). In brief, the event model works like this.
A bean defines an event if it provides. An application that wants to be notified when an. When the event occurs, the bean notifies all registered. A unicast event is a rare kind of event for. The. add registration method for a unicast event. Too. Many. Listeners. Exception if an. attempt is made to register more than a single listener.
The methods. exported by a bean are simply any. In addition to the regular sort of properties described earlier, the. Java. Beans API also supports several specialized property. An indexed proper.
A bound property is one that sends a. Property. Change.
Event to any interested. Property. Change. Listener objects whenever the. A constrained property is one that can. When the. value of a constrained property of a bean changes, the bean must.
Property. Change. Event to the list of. Vetoable. Change.
Listener objects. If. any of these objects throws a.
Property. Veto. Exception, the property value. Property. Veto. Exception. Because Java allows dynamic loading of classes, beanbox. The beanbox tool uses a. The introspection mechanism is implemented by the. Introspector class; it relies on both.
Java. Beans naming conventions. Introspector can determine the list of properties. The introspection mechanism does not rely on the reflection. Java alone, however.
Any bean can define an. Bean. Info class that provides. The Introspector. Bean. Info class of a bean. The Bean. Info class provides additional. Feature. Descriptor objects, each one describing a.
Each. Feature. Descriptor provides a name and brief. The beanbox tool can. Specific bean. features, such as properties, events, and methods, are described by. Feature. Descriptor, such as. Property. Descriptor, Event. Set. Descriptor. and Method. Descriptor. One of the primary tasks of a beanbox application is to allow the.
A beanbox. defines property editors for commonly used. If a. bean has a property of a more complicated type, however, it can. Property. Editor class that enables the. In addition, a complex bean may not be satisfied with the. Such a bean can define a. Customizer class to create a graphical interface. A particularly complex bean can even define customizers that serve.
A bean context is a logical container (and. Java. Beans and, optionally, for.
In practice, most Java. Beans are AWT. or Swing components or containers. Beanbox tools recognize this. A. bean context is a kind of heavyweight container that formalizes. More importantly, however, a bean. Beans that are aware of their context.
Bean contexts are implemented using. API, which is new. Java 1. 2 and discussed in more detail later in this chapter. Copyright © 2. 00.
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