| /* |
| * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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. */ |
| } |
| } |
| |
| } |