1 /*

     2  * Copyright (c) 2005, 2015, 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 com.sun.management.internal;

    27 

    28 import com.sun.management.VMOption;

    29 import com.sun.management.VMOption.Origin;

    30 import javax.management.openmbean.CompositeType;

    31 import javax.management.openmbean.CompositeData;

    32 import javax.management.openmbean.CompositeDataSupport;

    33 import javax.management.openmbean.OpenDataException;

    34 import sun.management.LazyCompositeData;

    35 import sun.management.MappedMXBeanType;

    36 

    37 /**

    38  * A CompositeData for VMOption for the local management support.

    39  * This class avoids the performance penalty paid to the

    40  * construction of a CompositeData use in the local case.

    41  */

    42 public class VMOptionCompositeData extends LazyCompositeData {

    43     private final VMOption option;

    44 

    45     private VMOptionCompositeData(VMOption option) {

    46         this.option = option;

    47     }

    48 

    49     public VMOption getVMOption() {

    50         return option;

    51     }

    52 

    53     public static CompositeData toCompositeData(VMOption option) {

    54         VMOptionCompositeData vcd = new VMOptionCompositeData(option);

    55         return vcd.getCompositeData();

    56     }

    57 

    58     protected CompositeData getCompositeData() {

    59         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

    60         // vmOptionItemNames!

    61         final Object[] vmOptionItemValues = {

    62             option.getName(),

    63             option.getValue(),

    64             option.isWriteable(),

    65             option.getOrigin().toString(),

    66         };

    67 

    68         try {

    69             return new CompositeDataSupport(vmOptionCompositeType,

    70                                             vmOptionItemNames,

    71                                             vmOptionItemValues);

    72         } catch (OpenDataException e) {

    73             // Should never reach here

    74             throw new AssertionError(e);

    75         }

    76     }

    77 

    78     private static final CompositeType vmOptionCompositeType;

    79     static {

    80         try {

    81             vmOptionCompositeType = (CompositeType)

    82                 MappedMXBeanType.toOpenType(VMOption.class);

    83         } catch (OpenDataException e) {

    84             // Should never reach here

    85             throw new AssertionError(e);

    86         }

    87     }

    88 

    89     static CompositeType getVMOptionCompositeType() {

    90         return vmOptionCompositeType;

    91     }

    92 

    93     private static final String NAME      = "name";

    94     private static final String VALUE     = "value";

    95     private static final String WRITEABLE = "writeable";

    96     private static final String ORIGIN    = "origin";

    97 

    98     private static final String[] vmOptionItemNames = {

    99         NAME,

   100         VALUE,

   101         WRITEABLE,

   102         ORIGIN,

   103     };

   104 

   105     public static String getName(CompositeData cd) {

   106         return getString(cd, NAME);

   107     }

   108     public static String getValue(CompositeData cd) {

   109         return getString(cd, VALUE);

   110     }

   111     public static Origin getOrigin(CompositeData cd) {

   112         String o = getString(cd, ORIGIN);

   113         return Enum.valueOf(Origin.class, o);

   114     }

   115     public static boolean isWriteable(CompositeData cd) {

   116         return getBoolean(cd, WRITEABLE);

   117     }

   118 

   119     /** Validate if the input CompositeData has the expected

   120      * CompositeType (i.e. contain all attributes with expected

   121      * names and types).

   122      */

   123     public static void validateCompositeData(CompositeData cd) {

   124         if (cd == null) {

   125             throw new NullPointerException("Null CompositeData");

   126         }

   127 

   128         if (!isTypeMatched(vmOptionCompositeType, cd.getCompositeType())) {

   129             throw new IllegalArgumentException(

   130                 "Unexpected composite type for VMOption");

   131         }

   132     }

   133 

   134     private static final long serialVersionUID = -2395573975093578470L;

   135 }