OpenMBeanInfoSupport (Java 2 Platform Ent. Ed. v1.4) - Java Platform, Enterprise Edition v1.4 API Specifications

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Java^TM 2 Platform
Ent. Ed. v1.4

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javax.management.openmbean
Class OpenMBeanInfoSupport

java.lang.Object
  javax.management.MBeanInfo
      javax.management.openmbean.OpenMBeanInfoSupport

All Implemented Interfaces:: Cloneable, OpenMBeanInfo, Serializable

public class OpenMBeanInfoSupport
extends MBeanInfo
implements OpenMBeanInfo, Serializable

The OpenMBeanInfoSupport class describes the management information of an open MBean: it is a subclass of MBeanInfo, and it implements the OpenMBeanInfo interface. Note that an open MBean is recognized as such if its getMBeanInfo() method returns an instance of a class which implements the OpenMBeanInfo interface, typically OpenMBeanInfoSupport.

Since:: JMX 1.1
Version:: 3.11 02/10/01
Author:: Sun Microsystems, Inc.
See Also:: Serialized Form

Constructor Summary

OpenMBeanInfoSupport(String className, String description, OpenMBeanAttributeInfo[] openAttributes, OpenMBeanConstructorInfo[] openConstructors, OpenMBeanOperationInfo[] openOperations, MBeanNotificationInfo[] notifications)
          Constructs an OpenMBeanInfoSupport instance, which describes a class of open MBeans with the specified className, description, openAttributes, openConstructors , openOperations and notifications.

Method Summary

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

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

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

Methods inherited from class javax.management.MBeanInfo

clone, getAttributes, getClassName, getConstructors, getDescription, getNotifications, getOperations

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface javax.management.openmbean.OpenMBeanInfo

getAttributes, getClassName, getConstructors, getDescription, getNotifications, getOperations

Constructor Detail

OpenMBeanInfoSupport

public OpenMBeanInfoSupport(String className,
                            String description,
                            OpenMBeanAttributeInfo[] openAttributes,
                            OpenMBeanConstructorInfo[] openConstructors,
                            OpenMBeanOperationInfo[] openOperations,
                            MBeanNotificationInfo[] notifications)

Constructs an OpenMBeanInfoSupport instance, which describes a class of open MBeans with the specified className, description, openAttributes, openConstructors , openOperations and notifications.

The openAttributes, openConstructors, openOperations and notifications array parameters are internally copied, so that subsequent changes to the arrays referenced by these parameters have no effect on this instance.

Parameters:

className - The fully qualified Java class name of the open MBean described by this OpenMBeanInfoSupport instance.

description - A human readable description of the open MBean described by this OpenMBeanInfoSupport instance.

openAttributes - The list of exposed attributes of the described open MBean; Must be an array of instances of a subclass of MBeanAttributeInfo, typically OpenMBeanAttributeInfoSupport.

openConstructors - The list of exposed public constructors of the described open MBean; Must be an array of instances of a subclass of MBeanConstructorInfo, typically OpenMBeanConstructorInfoSupport.

openOperations - The list of exposed operations of the described open MBean. Must be an array of instances of a subclass of MBeanOperationInfo, typically OpenMBeanOperationInfoSupport.

notifications - The list of notifications emitted by the described open MBean.

Throws:

ArrayStoreException - If openAttributes, openConstructors or openOperations is not an array of instances of a subclass of MBeanAttributeInfo, MBeanConstructorInfo or MBeanOperationInfo respectively.

Method Detail

equals

public boolean equals(Object obj)

Compares the specified obj parameter with this OpenMBeanInfoSupport instance for equality.

Returns true if and only if all of the following statements are true:

obj is non null,
obj also implements the OpenMBeanInfo interface,
their class names are equal
their infos on attributes, constructors, operations and notifications are equal

This ensures that this equals method works properly for obj parameters which are different implementations of the OpenMBeanInfo interface.

Specified by:: equals in interface OpenMBeanInfo
Overrides:: equals in class MBeanInfo

Parameters:: obj - the object to be compared for equality with this OpenMBeanInfoSupport instance;
Returns:: true if the specified object is equal to this OpenMBeanInfoSupport instance.

hashCode

public int hashCode()

Returns the hash code value for this OpenMBeanInfoSupport instance.

The hash code of an OpenMBeanInfoSupport instance is the sum of the hash codes of all elements of information used in equals comparisons (ie: its class name, and its infos on attributes, constructors, operations and notifications, where the hashCode of each of these arrays is calculated by a call to new java.util.HashSet(java.util.Arrays.asList(this.getSignature)).hashCode()).

This ensures that t1.equals(t2) implies that t1.hashCode()==t2.hashCode() for any two OpenMBeanInfoSupport instances t1 and t2, as required by the general contract of the method Object.hashCode .

However, note that another instance of a class implementing the OpenMBeanInfo interface may be equal to this OpenMBeanInfoSupport instance as defined by equals(java.lang.Object), but may have a different hash code if it is calculated differently.

As OpenMBeanInfoSupport 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 interface OpenMBeanInfo
Overrides:: hashCode in class MBeanInfo

Returns:: the hash code value for this OpenMBeanInfoSupport instance

toString

public String toString()

Returns a string representation of this OpenMBeanInfoSupport instance.

The string representation consists of the name of this class (ie javax.management.openmbean.OpenMBeanInfoSupport), the MBean class name, and the string representation of infos on attributes, constructors, operations and notifications of the described MBean.

As OpenMBeanInfoSupport 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 interface OpenMBeanInfo

Returns:: a string representation of this OpenMBeanInfoSupport instance