1 /*

     2  * Copyright (c) 2005, 2008, 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 sun.management;

    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 

    35 /**

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

    37  * This class avoids the performance penalty paid to the

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

    39  */

    40 public class VMOptionCompositeData extends LazyCompositeData {

    41     private final VMOption option;

    42 

    43     private VMOptionCompositeData(VMOption option) {

    44         this.option = option;

    45     }

    46 

    47     public VMOption getVMOption() {

    48         return option;

    49     }

    50 

    51     public static CompositeData toCompositeData(VMOption option) {

    52         VMOptionCompositeData vcd = new VMOptionCompositeData(option);

    53         return vcd.getCompositeData();

    54     }

    55 

    56     protected CompositeData getCompositeData() {

    57         // CONTENTS OF THIS ARRAY MUST BE SYNCHRONIZED WITH

    58         // vmOptionItemNames!

    59         final Object[] vmOptionItemValues = {

    60             option.getName(),

    61             option.getValue(),

    62             option.isWriteable(),

    63             option.getOrigin().toString(),

    64         };

    65 

    66         try {

    67             return new CompositeDataSupport(vmOptionCompositeType,

    68                                             vmOptionItemNames,

    69                                             vmOptionItemValues);

    70         } catch (OpenDataException e) {

    71             // Should never reach here

    72             throw new AssertionError(e);

    73         }

    74     }

    75 

    76     private static final CompositeType vmOptionCompositeType;

    77     static {

    78         try {

    79             vmOptionCompositeType = (CompositeType)

    80                 MappedMXBeanType.toOpenType(VMOption.class);

    81         } catch (OpenDataException e) {

    82             // Should never reach here

    83             throw new AssertionError(e);

    84         }

    85     }

    86 

    87     static CompositeType getVMOptionCompositeType() {

    88         return vmOptionCompositeType;

    89     }

    90 

    91     private static final String NAME      = "name";

    92     private static final String VALUE     = "value";

    93     private static final String WRITEABLE = "writeable";

    94     private static final String ORIGIN    = "origin";

    95 

    96     private static final String[] vmOptionItemNames = {

    97         NAME,

    98         VALUE,

    99         WRITEABLE,

   100         ORIGIN,

   101     };

   102 

   103     public static String getName(CompositeData cd) {

   104         return getString(cd, NAME);

   105     }

   106     public static String getValue(CompositeData cd) {

   107         return getString(cd, VALUE);

   108     }

   109     public static Origin getOrigin(CompositeData cd) {

   110         String o = getString(cd, ORIGIN);

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

   112     }

   113     public static boolean isWriteable(CompositeData cd) {

   114         return getBoolean(cd, WRITEABLE);

   115     }

   116 

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

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

   119      * names and types).

   120      */

   121     public static void validateCompositeData(CompositeData cd) {

   122         if (cd == null) {

   123             throw new NullPointerException("Null CompositeData");

   124         }

   125 

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

   127             throw new IllegalArgumentException(

   128                 "Unexpected composite type for VMOption");

   129         }

   130     }

   131 

   132     private static final long serialVersionUID = -2395573975093578470L;

   133 }