/*
* Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
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*
*/
package javax.management;
import java.security.
AccessController;
import com.sun.jmx.mbeanserver.
GetPropertyAction;
/**
* This class represents the name of the Java implementation class of
* the MBean. It is used for performing queries based on the class of
* the MBean.
* @serial include
*
* <p>The <b>serialVersionUID</b> of this class is <code>-1081892073854801359L</code>.
*
* @since 1.5
*/
@
SuppressWarnings("serial") // serialVersionUID is not constant
class
ClassAttributeValueExp extends
AttributeValueExp {
// Serialization compatibility stuff:
// Two serial forms are supported in this class. The selected form depends
// on system property "jmx.serial.form":
// - "1.0" for JMX 1.0
// - any other value for JMX 1.1 and higher
//
// Serial version for old serial form
private static final long
oldSerialVersionUID = -2212731951078526753L;
//
// Serial version for new serial form
private static final long
newSerialVersionUID = -1081892073854801359L;
private static final long
serialVersionUID;
static {
boolean
compat = false;
try {
GetPropertyAction act = new
GetPropertyAction("jmx.serial.form");
String form =
AccessController.
doPrivileged(
act);
compat = (
form != null &&
form.
equals("1.0"));
} catch (
Exception e) {
// OK: exception means no compat with 1.0, too bad
}
if (
compat)
serialVersionUID =
oldSerialVersionUID;
else
serialVersionUID =
newSerialVersionUID;
}
/**
* @serial The name of the attribute
*
* <p>The <b>serialVersionUID</b> of this class is <code>-1081892073854801359L</code>.
*/
private
String attr;
/**
* Basic Constructor.
*/
public
ClassAttributeValueExp() {
/* Compatibility: we have an attr field that we must hold on to
for serial compatibility, even though our parent has one too. */
super("Class");
attr = "Class";
}
/**
* Applies the ClassAttributeValueExp on an MBean. Returns the name of
* the Java implementation class of the MBean.
*
* @param name The name of the MBean on which the ClassAttributeValueExp will be applied.
*
* @return The ValueExp.
*
* @exception BadAttributeValueExpException
* @exception InvalidApplicationException
*/
public
ValueExp apply(
ObjectName name)
throws
BadStringOperationException,
BadBinaryOpValueExpException,
BadAttributeValueExpException,
InvalidApplicationException {
// getAttribute(name);
Object result =
getValue(
name);
if (
result instanceof
String) {
return new
StringValueExp((
String)
result);
} else {
throw new
BadAttributeValueExpException(
result);
}
}
/**
* Returns the string "Class" representing its value
*/
public
String toString() {
return
attr;
}
protected
Object getValue(
ObjectName name) {
try {
// Get the class of the object
MBeanServer server =
QueryEval.
getMBeanServer();
return
server.
getObjectInstance(
name).
getClassName();
} catch (
Exception re) {
return null;
/* In principle the MBean does exist because otherwise we
wouldn't be evaluating the query on it. But it could
potentially have disappeared in between the time we
discovered it and the time the query is evaluated.
Also, the exception could be a SecurityException.
Returning null from here will cause
BadAttributeValueExpException, which will in turn cause
this MBean to be omitted from the query result. */
}
}
}