- java.lang.Object
-
- javax.management.openmbean.CompositeDataInvocationHandler
-
- All Implemented Interfaces:
- InvocationHandler
public class CompositeDataInvocationHandler extends Object implements InvocationHandler
An
InvocationHandler
that forwards getter methods to aCompositeData
. If you have an interface that contains only getter methods (such asString getName()
orboolean isActive()
) then you can use this class in conjunction with theProxy
class to produce an implementation of the interface where each getter returns the value of the corresponding item in aCompositeData
.For example, suppose you have an interface like this:
public interface NamedNumber { public int getNumber(); public String getName(); }
CompositeData
constructed like this:CompositeData cd = new
CompositeDataSupport
( someCompositeType, new String[] {"number", "name"}, new Object[] {5, "five"} );NamedNumber
and backed by the objectcd
like this:InvocationHandler handler = new CompositeDataInvocationHandler(cd); NamedNumber nn = (NamedNumber) Proxy.newProxyInstance(NamedNumber.class.getClassLoader(), new Class[] {NamedNumber.class}, handler);
nn.getNumber()
will then return 5.If the first letter of the property defined by a getter is a capital, then this handler will look first for an item in the
CompositeData
beginning with a capital, then, if that is not found, for an item beginning with the corresponding lowercase letter or code point. For a getter calledgetNumber()
, the handler will first look for an item calledNumber
, then fornumber
. If the getter is calledgetnumber()
, then the item must be callednumber
.If the method given to
invoke
is the methodboolean equals(Object)
inherited fromObject
, then it will return true if and only if the argument is aProxy
whoseInvocationHandler
is also aCompositeDataInvocationHandler
and whose backingCompositeData
is equal (not necessarily identical) to this object's. If the method given toinvoke
is the methodint hashCode()
inherited fromObject
, then it will return a value that is consistent with this definition ofequals
: if two objects are equal according toequals
, then they will have the samehashCode
.- Since:
- 1.6
-
-
Constructor Summary
Constructors Constructor and Description CompositeDataInvocationHandler(CompositeData compositeData)
Construct a handler backed by the givenCompositeData
.
-
Method Summary
Methods Modifier and Type Method and Description CompositeData
getCompositeData()
Return theCompositeData
that was supplied to the constructor.Object
invoke(Object proxy, Method method, Object[] args)
Processes a method invocation on a proxy instance and returns the result.
-
-
-
Constructor Detail
-
CompositeDataInvocationHandler
public CompositeDataInvocationHandler(CompositeData compositeData)
Construct a handler backed by the given
CompositeData
.- Parameters:
compositeData
- theCompositeData
that will supply information to getters.- Throws:
IllegalArgumentException
- ifcompositeData
is null.
-
-
Method Detail
-
getCompositeData
public CompositeData getCompositeData()
Return theCompositeData
that was supplied to the constructor.- Returns:
- the
CompositeData
that this handler is backed by. This is never null.
-
invoke
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
Description copied from interface:InvocationHandler
Processes a method invocation on a proxy instance and returns the result. This method will be invoked on an invocation handler when a method is invoked on a proxy instance that it is associated with.- Specified by:
invoke
in interfaceInvocationHandler
- Parameters:
proxy
- the proxy instance that the method was invoked onmethod
- theMethod
instance corresponding to the interface method invoked on the proxy instance. The declaring class of theMethod
object will be the interface that the method was declared in, which may be a superinterface of the proxy interface that the proxy class inherits the method through.args
- an array of objects containing the values of the arguments passed in the method invocation on the proxy instance, ornull
if interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such asjava.lang.Integer
orjava.lang.Boolean
.- Returns:
- the value to return from the method invocation on the
proxy instance. If the declared return type of the interface
method is a primitive type, then the value returned by
this method must be an instance of the corresponding primitive
wrapper class; otherwise, it must be a type assignable to the
declared return type. If the value returned by this method is
null
and the interface method's return type is primitive, then aNullPointerException
will be thrown by the method invocation on the proxy instance. If the value returned by this method is otherwise not compatible with the interface method's declared return type as described above, aClassCastException
will be thrown by the method invocation on the proxy instance. - Throws:
Throwable
- the exception to throw from the method invocation on the proxy instance. The exception's type must be assignable either to any of the exception types declared in thethrows
clause of the interface method or to the unchecked exception typesjava.lang.RuntimeException
orjava.lang.Error
. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in thethrows
clause of the interface method, then anUndeclaredThrowableException
containing the exception that was thrown by this method will be thrown by the method invocation on the proxy instance.- See Also:
UndeclaredThrowableException
-
-
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