1 /*

     2  * Copyright (c) 2016, 2017, 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.tools.jdi;

    27 

    28 import com.sun.jdi.ClassLoaderReference;

    29 import com.sun.jdi.ModuleReference;

    30 import com.sun.jdi.VirtualMachine;

    31 

    32 class ModuleReferenceImpl extends ObjectReferenceImpl implements ModuleReference {

    33 

    34     protected ModuleReferenceImpl(VirtualMachine aVm, long aRef) {

    35         super(aVm, aRef);

    36     }

    37 

    38     protected String description() {

    39         return "ModuleReference " + ref();

    40     }

    41 

    42     private String name;

    43     private ClassLoaderReference classLoader;

    44 

    45     private boolean cachedName = false;

    46     private boolean cachedClassLoader = false;

    47 

    48 

    49     public synchronized String name() {

    50         if (cachedName) {

    51             return name;

    52         }

    53         try {

    54             name = JDWP.ModuleReference.Name.process(this.vm, this).name;

    55             if (name != null && name.length() == 0) {

    56                 // The JDWP returns empty name for unnamed modules

    57                 name = null;

    58             }

    59             cachedName = true;

    60         } catch (JDWPException ex) {

    61             throw ex.toJDIException();

    62         }

    63         return name;

    64     }

    65 

    66     public synchronized ClassLoaderReference classLoader() {

    67         if (cachedClassLoader) {

    68             return classLoader;

    69         }

    70         try {

    71             classLoader = JDWP.ModuleReference.ClassLoader.

    72                 process(this.vm, this).classLoader;

    73             cachedClassLoader = true;

    74         } catch (JDWPException ex) {

    75             throw ex.toJDIException();

    76         }

    77         return classLoader;

    78     }

    79 }