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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.lang.reflect 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.lang.reflect.VMReflection

VMReflection
final class VMReflection (Code)
Provides the package private methods requirered for the java.lang.reflect package implementation.

This class must be implemented according to the common policy for porting interfaces - see the porting interface overview for more detailes.

Note: this class design is based on requirements for the Field , Method and Constructor classes from the java.lang.reflect package. Each class (Field, Method, Constructor) should have a constructor that accepts an argument of the java.lang.Object type. This argument serves as an identifier of particular item. This identifier should be used later when one needs to operate with an item. For example, see VMReflection.getFieldType(Object)VMReflection.getFieldType(Object id) method.





Method Summary
native static  Class[]getExceptionTypes(long id)
     This method satisfies the requirements of the specification for the Method.getExceptionTypes Method.getExceptionTypes() method.
native static  ClassgetFieldType(long id)
     This method satisfies the requirements of the specification for the Field.getType Field.getType() method.
native static  ClassgetMethodReturnType(long id)
     This method satisfies the requirements of the specification for the Method.getReturnType Method.getReturnType() method.
native static  Class[]getParameterTypes(long id)
     This method satisfies the requirements of the specification for the Method.getParameterTypes Method.getParameterTypes() method.
native static  ObjectinvokeMethod(long id, Object object, Object... args)
     This method satisfies the requirements of the specification for the Method.invoke(java.lang.Objectjava.lang.Object[])Method.invoke(Object obj, Object[] args) method.
native static  ObjectnewArrayInstance(Class type, int[] dimensions)
     This method satisfies the requirements of the specification for the Array.newInstance(Classint[])Array.newInstance(Class componentType, int[] dimensions) method.
native static  ObjectnewClassInstance(long id, Object... args)
     This method satisfies the requirements of the specification for the Constructor.newInstance(java.lang.Object[])Constructor.newInstance(java.lang.Object[] initargs) method.



Method Detail
getExceptionTypes
native static Class[] getExceptionTypes(long id)(Code)
This method satisfies the requirements of the specification for the Method.getExceptionTypes Method.getExceptionTypes() method. But it takes one additional id parameter.
Parameters:
  id - an identifier of the caller class.



getFieldType
native static Class getFieldType(long id)(Code)
This method satisfies the requirements of the specification for the Field.getType Field.getType() method. But it takes one additional id parameter.
Parameters:
  id - an identifier of the caller class.



getMethodReturnType
native static Class getMethodReturnType(long id)(Code)
This method satisfies the requirements of the specification for the Method.getReturnType Method.getReturnType() method. But it takes one additional id parameter.
Parameters:
  id - an identifier of the caller class.



getParameterTypes
native static Class[] getParameterTypes(long id)(Code)
This method satisfies the requirements of the specification for the Method.getParameterTypes Method.getParameterTypes() method. But it takes one additional id parameter.
Parameters:
  id - an identifier of the caller class.



invokeMethod
native static Object invokeMethod(long id, Object object, Object... args) throws InvocationTargetException(Code)
This method satisfies the requirements of the specification for the Method.invoke(java.lang.Objectjava.lang.Object[])Method.invoke(Object obj, Object[] args) method. But it differs in several ways.

First, it takes one additional id parameter. This parameter is used as an identifier to invoke corresponding method.

Second, it doesn't perform access control so it doesn't throw an IllegalAccessException exception.

Third, it throws IllegalArgumentException only if the args argument doesn't fit to the actual method parameters.

Last, it doesn't throw an NullPointerException exception. If the id argument corresponds to a static method then the object argument must be null. An attempt to invoke a static method will be made in this case. If the id argument corresponds to a non-static method then corresponding object's method will be invoked.

Note: Under design yet. Subjected to change.
Parameters:
  id - the identifier of the method to be invoked.




newArrayInstance
native static Object newArrayInstance(Class type, int[] dimensions)(Code)
This method satisfies the requirements of the specification for the Array.newInstance(Classint[])Array.newInstance(Class componentType, int[] dimensions) method. But it differs in several ways.

First, it it doesn't throw an NullPointerException exception.

Second, it throws an IllegalArgumentException exception only if the implementation doesn't support specified number of dimensions.

Note: Under design yet. Subjected to change.




newClassInstance
native static Object newClassInstance(long id, Object... args) throws InvocationTargetException(Code)
This method satisfies the requirements of the specification for the Constructor.newInstance(java.lang.Object[])Constructor.newInstance(java.lang.Object[] initargs) method. But it differs in several ways.

First, it takes one additional id parameter. This parameter is used as an identifier of the corresponding constructor.

Second, it doesn't perform access control so it doesn't throw an IllegalAccessException exception.

Last, it doesn't throw an InstantiationException exception. The id argument must not correspond to an abstract class.

Note: Under design yet. Subjected to change.
Parameters:
  id - the identifier of the method to be invoked.




Methods inherited from java.lang.Object
protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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