javax.management
Class AttributeValueExp

java.lang.Object
  javax.management.AttributeValueExp

All Implemented Interfaces:

java.io.Serializable, ValueExp

public class AttributeValueExp

extends java.lang.Object

implements ValueExp

Represents attributes used as arguments to relational constraints. An AttributeValueExp may be used anywhere a ValueExp is required.

See Also:

Serialized Form

Constructor Summary

AttributeValueExp()
Deprecated. An instance created with this constructor cannot be used in a query.

AttributeValueExp(java.lang.String attr)
Creates a new AttributeValueExp representing the specified object attribute, named attr.

Method Summary

ValueExp	apply(ObjectName name) Applies the AttributeValueExp on an MBean.
protected java.lang.Object	getAttribute(ObjectName name) Return the value of the given attribute in the named MBean.
java.lang.String	getAttributeName() Returns a string representation of the name of the attribute.
void	setMBeanServer(MBeanServer s) Sets the MBean server on which the query is to be performed.
java.lang.String	toString() Returns the string representing its value.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AttributeValueExp

public AttributeValueExp()

Deprecated. An instance created with this constructor cannot be used in a query.

An AttributeValueExp with a null attribute.

AttributeValueExp

public AttributeValueExp(java.lang.String attr)

Creates a new AttributeValueExp representing the specified object attribute, named attr.

Parameters:

attr - the name of the attribute whose value is the value of this ValueExp.

Method Detail

getAttributeName

public java.lang.String getAttributeName()

Returns a string representation of the name of the attribute.

Returns:

the attribute name.

apply

public ValueExp apply(ObjectName name)
               throws BadStringOperationException,
                      BadBinaryOpValueExpException,
                      BadAttributeValueExpException,
                      InvalidApplicationException

Applies the AttributeValueExp on an MBean.

Specified by:

apply in interface ValueExp

Parameters:

name - The name of the MBean on which the AttributeValueExp will be applied.

Returns:

The ValueExp.

Throws:

BadAttributeValueExpException

InvalidApplicationException

BadStringOperationException

BadBinaryOpValueExpException

toString

public java.lang.String toString()

Returns the string representing its value.

setMBeanServer

public void setMBeanServer(MBeanServer s)

Sets the MBean server on which the query is to be performed.

Specified by:

setMBeanServer in interface ValueExp

Parameters:

s - The MBean server on which the query is to be performed.

getAttribute

protected java.lang.Object getAttribute(ObjectName name)

Return the value of the given attribute in the named MBean. If the attempt to access the attribute generates an exception, return null.

Parameters:

name - the name of the MBean whose attribute is to be returned.

Returns:

the value of the attribute, or null if it could not be obtained.