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1   /*
2    * Copyright (c) 1998, 2011, 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.*;
29  import java.util.*;
30  
31  public class ClassLoaderReferenceImpl extends ObjectReferenceImpl
32                    implements ClassLoaderReference, VMListener  {
33  
34      // This is cached only while the VM is suspended
35      private static class Cache extends ObjectReferenceImpl.Cache {
36          List<ReferenceType> visibleClasses = null;
37      }
38  
39      protected ObjectReferenceImpl.Cache newCache() {
40          return new Cache();
41      }
42  
43      ClassLoaderReferenceImpl(VirtualMachine aVm, long ref) {
44          super(aVm, ref);
45          vm.state().addListener(this);
46      }
47  
48      protected String description() {
49          return "ClassLoaderReference " + uniqueID();
50      }
51  
52      public List<ReferenceType> definedClasses() {
53          ArrayList<ReferenceType> definedClasses = new ArrayList<ReferenceType>();
54          for (ReferenceType type :  vm.allClasses()) {
55              if (type.isPrepared() &&
56                  equals(type.classLoader())) {
57                  definedClasses.add(type);
58              }
59          }
60          return definedClasses;
61      }
62  
63      public List<ReferenceType> visibleClasses() {
64          List<ReferenceType> classes = null;
65          try {
66              Cache local = (Cache)getCache();
67  
68              if (local != null) {
69                  classes = local.visibleClasses;
70              }
71              if (classes == null) {
72                  JDWP.ClassLoaderReference.VisibleClasses.ClassInfo[]
73                    jdwpClasses = JDWP.ClassLoaderReference.VisibleClasses.
74                                              process(vm, this).classes;
75                  classes = new ArrayList<ReferenceType>(jdwpClasses.length);
76                  for (int i = 0; i < jdwpClasses.length; ++i) {
77                      classes.add(vm.referenceType(jdwpClasses[i].typeID,
78                                                   jdwpClasses[i].refTypeTag));
79                  }
80                  classes = Collections.unmodifiableList(classes);
81                  if (local != null) {
82                      local.visibleClasses = classes;
83                      if ((vm.traceFlags & VirtualMachine.TRACE_OBJREFS) != 0) {
84                          vm.printTrace(description() +
85                             " temporarily caching visible classes (count = " +
86                                        classes.size() + ")");
87                      }
88                  }
89              }
90          } catch (JDWPException exc) {
91              throw exc.toJDIException();
92          }
93          return classes;
94      }
95  
96      Type findType(String signature) throws ClassNotLoadedException {
97          List<ReferenceType> types = visibleClasses();
98          Iterator<ReferenceType> iter = types.iterator();
99          while (iter.hasNext()) {
100             ReferenceType type = iter.next();
101             if (type.signature().equals(signature)) {
102                 return type;
103             }
104         }
105         JNITypeParser parser = new JNITypeParser(signature);
106         throw new ClassNotLoadedException(parser.typeName(),
107                                          "Class " + parser.typeName() + " not loaded");
108     }
109 
110     byte typeValueKey() {
111         return JDWP.Tag.CLASS_LOADER;
112     }
113 }