- All Implemented Interfaces:
InvocationHandler
public class CompositeDataInvocationHandler extends Object implements InvocationHandler
An InvocationHandler
that forwards getter methods to a
CompositeData
. If you have an interface that contains
only getter methods (such as String getName()
or
boolean isActive()
) then you can use this class in
conjunction with the Proxy
class to produce an implementation
of the interface where each getter returns the value of the
corresponding item in a CompositeData
.
For example, suppose you have an interface like this:
and apublic interface NamedNumber { public int getNumber(); public String getName(); }
CompositeData
constructed like this:
then you can construct an object implementingCompositeData cd = newCompositeDataSupport
( someCompositeType, new String[] {"number", "name"}, new Object[] {5, "five"} );
NamedNumber
and backed by the object cd
like this:
A call toInvocationHandler 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 called getNumber()
, the
handler will first look for an item called Number
, then for
number
. If the getter is called getnumber()
, then
the item must be called number
.
If the method given to invoke
is the method
boolean equals(Object)
inherited from Object
, then
it will return true if and only if the argument is a Proxy
whose InvocationHandler
is also a
CompositeDataInvocationHandler
and whose backing
CompositeData
is equal (not necessarily identical) to this
object's. If the method given to invoke
is the method
int hashCode()
inherited from Object
, then it will
return a value that is consistent with this definition of
equals
: if two objects are equal according to equals
, then
they will have the same hashCode
.
- Since:
- 1.6
-
Constructor Summary
Constructors Constructor Description CompositeDataInvocationHandler(CompositeData compositeData)
Construct a handler backed by the givenCompositeData
. -
Method Summary
Modifier and Type Method Description CompositeData
getCompositeData()
Return theCompositeData
that was supplied to the constructor.Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods declared in interface java.lang.reflect.InvocationHandler
invoke
-
Constructor Details
-
CompositeDataInvocationHandler
Construct a handler backed by the given
CompositeData
.- Parameters:
compositeData
- theCompositeData
that will supply information to getters.- Throws:
IllegalArgumentException
- ifcompositeData
is null.
-
-
Method Details
-
getCompositeData
Return theCompositeData
that was supplied to the constructor.- Returns:
- the
CompositeData
that this handler is backed by. This is never null.
-