Showing the changes to java/pkg/javax/management/ClassAttributeValueExp.java (1 of 18352 files). Show all
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| 1 | /* | ||
| 2 | * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package javax.management; | ||
| 27 | |||
| 28 | import java.security.AccessController; | ||
| 29 | |||
| 30 | import com.sun.jmx.mbeanserver.GetPropertyAction; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * This class represents the name of the Java implementation class of | ||
| 34 | * the MBean. It is used for performing queries based on the class of | ||
| 35 | * the MBean. | ||
| 36 | * @serial include | ||
| 37 | * | ||
| 38 | * <p>The <b>serialVersionUID</b> of this class is <code>-1081892073854801359L</code>. | ||
| 39 | * | ||
| 40 | * @since 1.5 | ||
| 41 | */ | ||
| 42 | @SuppressWarnings("serial") // serialVersionUID is not constant | ||
| 43 | class ClassAttributeValueExp extends AttributeValueExp { | ||
| 44 | |||
| 45 | // Serialization compatibility stuff: | ||
| 46 | // Two serial forms are supported in this class. The selected form depends | ||
| 47 | // on system property "jmx.serial.form": | ||
| 48 | // - "1.0" for JMX 1.0 | ||
| 49 | // - any other value for JMX 1.1 and higher | ||
| 50 | // | ||
| 51 | // Serial version for old serial form | ||
| 52 | private static final long oldSerialVersionUID = -2212731951078526753L; | ||
| 53 | // | ||
| 54 | // Serial version for new serial form | ||
| 55 | private static final long newSerialVersionUID = -1081892073854801359L; | ||
| 56 | |||
| 57 | private static final long serialVersionUID; | ||
| 58 | static { | ||
| 59 | boolean compat = false; | ||
| 60 | try { | ||
| 61 | GetPropertyAction act = new GetPropertyAction("jmx.serial.form"); | ||
| 62 | String form = AccessController.doPrivileged(act); | ||
| 63 | compat = (form != null && form.equals("1.0")); | ||
| 64 | } catch (Exception e) { | ||
| 65 | // OK: exception means no compat with 1.0, too bad | ||
| 66 | } | ||
| 67 | if (compat) | ||
| 68 | serialVersionUID = oldSerialVersionUID; | ||
| 69 | else | ||
| 70 | serialVersionUID = newSerialVersionUID; | ||
| 71 | } | ||
| 72 | |||
| 73 | /** | ||
| 74 | * @serial The name of the attribute | ||
| 75 | * | ||
| 76 | * <p>The <b>serialVersionUID</b> of this class is <code>-1081892073854801359L</code>. | ||
| 77 | */ | ||
| 78 | private String attr; | ||
| 79 | |||
| 80 | /** | ||
| 81 | * Basic Constructor. | ||
| 82 | */ | ||
| 83 | public ClassAttributeValueExp() { | ||
| 84 | /* Compatibility: we have an attr field that we must hold on to | ||
| 85 | for serial compatibility, even though our parent has one too. */ | ||
| 86 | super("Class"); | ||
| 87 | attr = "Class"; | ||
| 88 | } | ||
| 89 | |||
| 90 | |||
| 91 | /** | ||
| 92 | * Applies the ClassAttributeValueExp on an MBean. Returns the name of | ||
| 93 | * the Java implementation class of the MBean. | ||
| 94 | * | ||
| 95 | * @param name The name of the MBean on which the ClassAttributeValueExp will be applied. | ||
| 96 | * | ||
| 97 | * @return The ValueExp. | ||
| 98 | * | ||
| 99 | * @exception BadAttributeValueExpException | ||
| 100 | * @exception InvalidApplicationException | ||
| 101 | */ | ||
| 102 | public ValueExp apply(ObjectName name) | ||
| 103 | throws BadStringOperationException, BadBinaryOpValueExpException, | ||
| 104 | BadAttributeValueExpException, InvalidApplicationException { | ||
| 105 | // getAttribute(name); | ||
| 106 | Object result = getValue(name); | ||
| 107 | if (result instanceof String) { | ||
| 108 | return new StringValueExp((String)result); | ||
| 109 | } else { | ||
| 110 | throw new BadAttributeValueExpException(result); | ||
| 111 | } | ||
| 112 | } | ||
| 113 | |||
| 114 | /** | ||
| 115 | * Returns the string "Class" representing its value | ||
| 116 | */ | ||
| 117 | public String toString() { | ||
| 118 | return attr; | ||
| 119 | } | ||
| 120 | |||
| 121 | |||
| 122 | protected Object getValue(ObjectName name) { | ||
| 123 | try { | ||
| 124 | // Get the class of the object | ||
| 125 | MBeanServer server = QueryEval.getMBeanServer(); | ||
| 126 | return server.getObjectInstance(name).getClassName(); | ||
| 127 | } catch (Exception re) { | ||
| 128 | return null; | ||
| 129 | /* In principle the MBean does exist because otherwise we | ||
| 130 | wouldn't be evaluating the query on it. But it could | ||
| 131 | potentially have disappeared in between the time we | ||
| 132 | discovered it and the time the query is evaluated. | ||
| 133 | |||
| 134 | Also, the exception could be a SecurityException. | ||
| 135 | |||
| 136 | Returning null from here will cause | ||
| 137 | BadAttributeValueExpException, which will in turn cause | ||
| 138 | this MBean to be omitted from the query result. */ | ||
| 139 | } | ||
| 140 | } | ||
| 141 | |||
| 142 | } | ||