- All Implemented Interfaces:
- 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:
   
   public interface NamedNumber {
       public int getNumber();
       public String getName();
   }
   
   
   and a CompositeData constructed like this:
   
   
   CompositeData cd =
       new CompositeDataSupport(
           someCompositeType,
           new String[] {"number", "name"},
           new Object[] {5, "five"}
       );
   
   
   then you can construct an object implementing NamedNumber
   and backed by the object cd like this:
   
   
   InvocationHandler handler =
       new CompositeDataInvocationHandler(cd);
   NamedNumber nn = (NamedNumber)
       Proxy.newProxyInstance(NamedNumber.class.getClassLoader(),
                              new Class[] {NamedNumber.class},
                              handler);
   
   
   A call to 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 SummaryConstructorsConstructorDescriptionCompositeDataInvocationHandler(CompositeData compositeData) Construct a handler backed by the givenCompositeData.
- 
Method SummaryModifier and TypeMethodDescriptionReturn theCompositeDatathat was supplied to the constructor.Processes a method invocation on a proxy instance and returns the result.
- 
Constructor Details- 
CompositeDataInvocationHandlerConstruct a handler backed by the given CompositeData.- Parameters:
- compositeData- the- CompositeDatathat will supply information to getters.
- Throws:
- IllegalArgumentException- if- compositeDatais null.
 
 
- 
- 
Method Details- 
getCompositeDataReturn theCompositeDatathat was supplied to the constructor.- Returns:
- the CompositeDatathat this handler is backed by. This is never null.
 
- 
invokeDescription copied from interface:InvocationHandlerProcesses 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:
- invokein interface- InvocationHandler
- Parameters:
- proxy- the proxy instance that the method was invoked on
- method- the- Methodinstance corresponding to the interface method invoked on the proxy instance. The declaring class of the- Methodobject 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, or- nullif interface method takes no arguments. Arguments of primitive types are wrapped in instances of the appropriate primitive wrapper class, such as- java.lang.Integeror- java.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
 nulland the interface method's return type is primitive, then aNullPointerExceptionwill 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, aClassCastExceptionwill 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 the- throwsclause of the interface method or to the unchecked exception types- java.lang.RuntimeExceptionor- java.lang.Error. If a checked exception is thrown by this method that is not assignable to any of the exception types declared in the- throwsclause of the interface method, then an- UndeclaredThrowableExceptioncontaining the exception that was thrown by this method will be thrown by the method invocation on the proxy instance.
- See Also:
 
 
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