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 | +} | |