javax.management.openmbean
Class CompositeDataInvocationHandler
- InvocationHandler
Provides an
InvocationHandler which
implements a series of accessor methods (those beginning with
"get" or
"is") using the content of a
CompositeData object. An instance of
CompositeData
consists of a series of key-value mappings. This handler assumes
these keys to be the names of attributes, and thus provides
accessor methods by returning the associated value.
As an example, consider the following interface:
public interface Person
{
public String getName();
public Date getBirthday();
}
This specifies two accessor methods for retrieving the attributes,
name and
birthday. An implementation of this interface
can be provided by creating an instance of this class, using a
CompositeData object with appropriate key-value mappings
(e.g. "name" => "Fred", "birthday" => 30/06/1974), and then passing
that to
Proxy.newProxyInstance(ClassLoader,Class[],InvocationHandler) along with
the interface itself. The invocation handler implements the methods
by calling
CompositeData.get(String) with the appropriate key.
The attribute name is derived by taking the remainder of the method
name following
"get". If the first letter of this substring
is uppercase, then two attempts are made to retrieve the attribute
from the
CompositeData instance: one using the original substring,
and one with the first letter changed to its lower-case equivalent.
If the first letter is lowercase, only the exact substring is used.
An
Object.equals(Object) implementation is provided. This returns
true if the argument is a proxy with a
CompositeDataInvocationHandler
using an equivalent
CompositeData instance.
Object.hashCode()
is also defined so as to match this implementation and give equivalent instances
the same hashcode.
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
invoke
public Object invoke(Object proxy,
Method method,
Object[] args)
throws Throwable Called by the proxy class whenever a method is called. The
handler only deals with accessor methods (beginning with
"get" or
"is"),
equals, and
"hashCode". Accessor methods are implemented by
returning the appropriate value from the
CompositeData
instance, while
equals and
hashCode allow
two proxies with a
CompositeDataInvocationHandler using
the same
CompositeData instance to be classified
as equivalent.
- invoke in interface InvocationHandler
proxy - the proxy on which the method was called.method - the method which was called.args - the arguments supplied to the method.
- the return value from the method.
Throwable - if an exception is thrown in the process.
CompositeDataInvocationHandler.java - Pseudo-accessors for CompositeData.
Copyright (C) 2007 Free Software Foundation
This file is part of GNU Classpath.
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