Serializable
, ValueExp
public class AttributeValueExp extends Object implements ValueExp
Represents attributes used as arguments to relational constraints. Instances of this class are usually obtained using Query.attr
.
An AttributeValueExp
may be used anywhere a ValueExp
is required.
Constructor | Description |
---|---|
AttributeValueExp() |
Deprecated. An instance created with this constructor cannot be used in a query. |
AttributeValueExp |
Creates a new AttributeValueExp representing the specified object attribute, named attr. |
Modifier and Type | Method | Description |
---|---|---|
ValueExp |
apply |
Applies the AttributeValueExp on an MBean. |
protected Object |
getAttribute |
Return the value of the given attribute in the named MBean. |
String |
getAttributeName() |
Returns a string representation of the name of the attribute. |
void |
setMBeanServer |
Deprecated. This method has no effect. |
String |
toString() |
Returns the string representing its value. |
@Deprecated public AttributeValueExp()
AttributeValueExp
with a null attribute.public AttributeValueExp(String attr)
AttributeValueExp
representing the specified object attribute, named attr.attr
- the name of the attribute whose value is the value of this ValueExp
.public String getAttributeName()
public ValueExp apply(ObjectName name) throws BadStringOperationException, BadBinaryOpValueExpException, BadAttributeValueExpException, InvalidApplicationException
Applies the AttributeValueExp
on an MBean. This method calls getAttribute(name)
and wraps the result as a ValueExp
. The value returned by getAttribute
must be a Number
, String
, or Boolean
; otherwise this method throws a BadAttributeValueExpException
, which will cause the containing query to be false for this name
.
apply
in interface ValueExp
name
- The name of the MBean on which the AttributeValueExp
will be applied.ValueExp
.BadStringOperationException
- when an invalid string operation is passed to a method for constructing a queryBadBinaryOpValueExpException
- when an invalid expression is passed to a method for constructing a queryBadAttributeValueExpException
- when an invalid MBean attribute is passed to a query constructing methodInvalidApplicationException
- when an invalid apply is attemptedpublic String toString()
@Deprecated public void setMBeanServer(MBeanServer s)
QueryEval.getMBeanServer()
.setMBeanServer
in interface ValueExp
s
- The MBean server on which the query is to be performed.protected 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.
The MBean Server used is the one returned by QueryEval.getMBeanServer()
.
name
- the name of the MBean whose attribute is to be returned.
© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.management/javax/management/AttributeValueExp.html