javax.management.openmbean
Class ArrayType

java.lang.Object
  extended byjavax.management.openmbean.OpenType
      extended byjavax.management.openmbean.ArrayType
All Implemented Interfaces:
Serializable
public class ArrayType
extends OpenType
implements Serializable

The ArrayType class is the open type class whose instances describe all open data values which are n-dimensional arrays of open data values.

Since:
JMX 1.1
Version:
3.13 02/10/01
Author:
Sun Microsystems, Inc.
See Also:
Serialized Form

Field Summary
 
Fields inherited from class javax.management.openmbean.OpenType
ALLOWED_CLASSNAMES
 

 

Constructor Summary

ArrayType(int dimension, OpenType elementType)
          Constructs an ArrayType instance describing open data values which are arrays with dimension dimension of elements whose open type is elementType.
 
Method Summary
 boolean equals(Object obj)
          Compares the specified obj parameter with this ArrayType instance for equality.
 int getDimension()
          Returns the dimension of arrays described by this ArrayType instance.
 OpenType getElementOpenType()
          Returns the open type of element values contained in the arrays described by this ArrayType instance.
 int hashCode()
          Returns the hash code value for this ArrayType instance.
 boolean isValue(Object obj)
          Tests whether obj is a value for this ArrayType instance.
 String toString()
          Returns a string representation of this ArrayType instance.
 
Methods inherited from class javax.management.openmbean.OpenType
getClassName, getDescription, getTypeName, isArray
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ArrayType

public ArrayType(int dimension,
                 OpenType elementType)
          throws OpenDataException
Constructs an ArrayType instance describing open data values which are arrays with dimension dimension of elements whose open type is elementType.

When invoked on an ArrayType instance, the getClassName method returns the class name of the array instances it describes (following the rules defined by the getName method of java.lang.Class), not the class name of the array elements (which is returned by a call to getElementOpenType().getClassName()).

The internal field corresponding to the type name of this ArrayType instance is also set to the class name of the array instances it describes. In other words, the methods getClassName and getTypeName return the same string value. The internal field corresponding to the description of this ArrayType instance is set to a string value which follows the following template:
<dimension>-dimension array of <element_class_name>

As an example, the following piece of code: 

 ArrayType t = new ArrayType(3, SimpleType.STRING);
 System.out.println("array class name       = "+ t.getClassName());
 System.out.println("element class name     = "+ t.getElementOpenType().getClassName());
 System.out.println("array type name        = "+ t.getTypeName());
 System.out.println("array type description = "+ t.getDescription());
would produce the following output: 

 array class name       = [[[java.lang.String;
 element class name     = java.lang.String
 array type name        = [[[java.lang.String;
 array type description = 3-dimension array of java.lang.String

Parameters:
dimension - the dimension of arrays described by this ArrayType instance; must be greater than or equal to 1.
elementType - the open type of element values contained in the arrays described by this ArrayType instance; must be an instance of either SimpleType, CompositeType or TabularType.
Throws:
IllegalArgumentException - if dimension is not a positive integer
OpenDataException - if elementType is an instance of ArrayType
Method Detail

getDimension

public int getDimension()
Returns the dimension of arrays described by this ArrayType instance.

Returns:
the dimension.

getElementOpenType

public OpenType getElementOpenType()
Returns the open type of element values contained in the arrays described by this ArrayType instance.

Returns:
the element type.

isValue

public boolean isValue(Object obj)
Tests whether obj is a value for this ArrayType instance.

This method returns true if and only if obj is not null, obj is an array and any one of the following is true:

  • if this ArrayType instance describes an array of SimpleType elements, obj's class name is the same as the className field defined for this ArrayType instance (ie the class name returned by the getClassName method, which includes the dimension information),
     

  • if this ArrayType instance describes an array of classes implementing the TabularData interface or the CompositeData interface, obj is assignable to such a declared array, and each element contained in obj is either null or a valid value for the element's open type specified by this ArrayType instance.

Specified by:
isValue in class OpenType
Parameters:
obj - the object to be tested.
Returns:
true if obj is a value for this ArrayType instance.

equals

public boolean equals(Object obj)
Compares the specified obj parameter with this ArrayType instance for equality.

Two ArrayType instances are equal if and only if they describes array instances which have the same dimension and elements' open type.

Specified by:
equals in class OpenType
Parameters:
obj - the object to be compared for equality with this ArrayType instance; if obj is null or is not an instance of the class ArrayType, equals returns false.
Returns:
true if the specified object is equal to this ArrayType instance.

hashCode

public int hashCode()
Returns the hash code value for this ArrayType instance.

The hash code of a ArrayType instance is the sum of the hash codes of all elements of information used in equals comparisons (ie: dimension and elements' type). This ensures that t1.equals(t2) implies that t1.hashCode()==t2.hashCode() for any two ArrayType instances t1 and t2, as required by the general contract of the method Object.hashCode .

As ArrayType instances are immutable, the hash code for this instance is calculated once, on the first call to hashCode, and then the same value is returned for subsequent calls.

Specified by:
hashCode in class OpenType
Returns:
the hash code value for this ArrayType instance

toString

public String toString()
Returns a string representation of this ArrayType instance.

The string representation consists of the name of this class (ie javax.management.openmbean.ArrayType), the type name, the dimension and elements' type defined for this instance,

As ArrayType instances are immutable, the string representation for this instance is calculated once, on the first call to toString, and then the same value is returned for subsequent calls.

Specified by:
toString in class OpenType
Returns:
a string representation of this ArrayType instance
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Copyright 2003 Sun Microsystems, Inc. All rights reserved.