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