java.beans
public class Beans extends Object
Beans provides some helper methods that allow the basic
operations of Bean-ness.
Since: 1.1
UNKNOWN: updated to 1.4
| Constructor Summary | |
|---|---|
| Beans()
Once again, we have a java.beans class with only
static methods that can be instantiated. | |
| Method Summary | |
|---|---|
| static Object | getInstanceOf(Object bean, Class<?> newClass)
Returns the Bean as a different class type.
|
| static Object | instantiate(ClassLoader cl, String beanName) Creates a bean.
|
| static Object | instantiate(ClassLoader cl, String beanName, BeanContext beanContext) Creates a bean.
|
| static Object | instantiate(ClassLoader cl, String beanName, BeanContext beanContext, AppletInitializer initializer) Instantiates a bean according to Beans 1.0.
|
| static boolean | isDesignTime()
Returns whether it is design time. |
| static boolean | isGuiAvailable()
Returns whether the GUI is available to use.
|
| static boolean | isInstanceOf(Object bean, Class<?> newBeanClass)
Determines whether the Bean can be cast to a different
class type.
|
| static void | setDesignTime(boolean designTime)
Sets whether it is design time. |
| static void | setGuiAvailable(boolean guiAvailable)
Sets whether the GUI is available to use.
|
Parameters: bean the Bean to cast. newClass the Class to cast it to.
Returns: the Bean as a new view, or if the operation could not be performed, the Bean itself.
This is a convenience method that calls instantiate(cl, beanName, null, null).
Parameters: cl ClassLoader to be used or null for the system classloader. beanName Name of a serialized bean or class name.
Returns: A newly created bean.
Throws: IOException If access of an IO resource failed. ClassNotFoundException If the class name is not known or does not lead to a proper bean class.
See Also: instantiate(ClassLoader, String, BeanContext, AppletInitializer)
This is a convenience method that calls instantiate(cl, beanName, beanContext, null).
Parameters: cl ClassLoader to be used or null for the system classloader. beanName Name of a serialized bean or class name. beanContext Context to which the newly created Bean should be added.
Returns: A newly created bean.
Throws: IOException If access of an IO resource failed. ClassNotFoundException If the class name is not known or does not lead to a proper bean class.
See Also: instantiate(ClassLoader, String, BeanContext, AppletInitializer)
In Beans 1.0 the instantiation scheme is as follows:
The name should be dot-separated (e.g "place.for.beans.myBean") and indicate either a
serialized object or a class name. In the first case all dots in the name are replaced with
slashes ('/') and ".ser" is appended ("place.for.beans.myBean" becomes "place/for/beans/myBean.ser").
The bean is then loaded as an application or system resource depending on whether a
ClassLoader was provided.
If no such resource exists or if it contains no bean the name is interpreted as a class name of which an instance is then created.
If a BeanContext instance is available the created bean is added to it.
If the created Bean is an Applet or subclass and an AppletInitializer
instance is available the applet is initialized and afterwards activated using the initializer. Additionally
every instantiated Applet bean is initialized using the {@link Applet.init} method.
Furthermore every applet gets a default AppletStub. The Applet's
document base is the location of the ".ser" file if it was deserialized or the location of its class
file if it was instantiated.
A ClassNotFoundException is not only thrown when a class name was unknown
but even when the class has public no-argument constructor
(IllegalAccessException is wrapped) or an exception is thrown while
invoking such a constructor (causing exception is wrapped).
Parameters: cl ClassLoader to be used or null for the system classloader. beanName Name of a serialized bean or class name. beanContext Context to which the newly created Bean should be added. initializer The AppletInitializer which is used for initializing Applet beans.
Returns: A newly created bean.
Throws: IOException If access of an IO resource failed. ClassNotFoundException If the class name is not known or does not lead to a proper bean class.
Defaults to false.
Returns: whether it is design time.
Defaults to true.
Returns: whether the GUI is available to use.
Parameters: bean the Bean to cast. newClass the Class to cast it to.
Returns: whether the Bean can be cast to the class type in question.
Parameters: designTime whether it is design time.
Parameters: guiAvailable whether the GUI is available to use.