1 /*
   2  * Copyright (c) 2002, 2005, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.utilities;
  26 
  27 import java.util.*;
  28 import sun.jvm.hotspot.classfile.*;
  29 import sun.jvm.hotspot.oops.*;
  30 import sun.jvm.hotspot.memory.*;
  31 import sun.jvm.hotspot.runtime.*;
  32 
  33 public class SystemDictionaryHelper {
  34    static {
  35       VM.registerVMInitializedObserver(new Observer() {
  36          public void update(Observable o, Object data) {
  37             initialize();
  38          }
  39       });
  40    }
  41 
  42    private static synchronized void initialize() {
  43       klasses = null;
  44    }
  45 
  46    // Instance klass array sorted by name.
  47    private static InstanceKlass[] klasses;
  48 
  49    // side-effect!. caches the instance klass array.
  50    public static synchronized InstanceKlass[] getAllInstanceKlasses() {
  51       if (klasses != null) {
  52          return klasses;
  53       }
  54 
  55       final Vector tmp = new Vector();
  56       ClassLoaderDataGraph cldg = VM.getVM().getClassLoaderDataGraph();
  57       cldg.classesDo(new ClassLoaderDataGraph.ClassVisitor() {
  58                         public void visit(Klass k) {
  59                            if (k instanceof InstanceKlass) {
  60                               InstanceKlass ik = (InstanceKlass) k;
  61                               tmp.add(ik);
  62                            }
  63                         }
  64                      });
  65 
  66       Object[] tmpArray = tmp.toArray();
  67       klasses = new InstanceKlass[tmpArray.length];
  68       System.arraycopy(tmpArray, 0, klasses, 0, tmpArray.length);
  69       Arrays.sort(klasses, new Comparator() {
  70                           public int compare(Object o1, Object o2) {
  71                              InstanceKlass k1 = (InstanceKlass) o1;
  72                              InstanceKlass k2 = (InstanceKlass) o2;
  73                              Symbol s1 = k1.getName();
  74                              Symbol s2 = k2.getName();
  75                              return s1.asString().compareTo(s2.asString());
  76                           }
  77                       });
  78       return klasses;
  79    }
  80 
  81    // returns array of instance klasses whose name contains given namePart
  82    public static InstanceKlass[] findInstanceKlasses(String namePart) {
  83       namePart = namePart.replace('.', '/');
  84       InstanceKlass[] tmpKlasses = getAllInstanceKlasses();
  85 
  86       Vector tmp = new Vector();
  87       for (int i = 0; i < tmpKlasses.length; i++) {
  88          String name = tmpKlasses[i].getName().asString();
  89          if (name.indexOf(namePart) != -1) {
  90             tmp.add(tmpKlasses[i]);
  91          }
  92       }
  93 
  94       Object[] tmpArray = tmp.toArray();
  95       InstanceKlass[] searchResult = new InstanceKlass[tmpArray.length];
  96       System.arraycopy(tmpArray, 0, searchResult, 0, tmpArray.length);
  97       return searchResult;
  98    }
  99 
 100    // find first class whose name matches exactly the given argument.
 101    public static InstanceKlass findInstanceKlass(String className) {
 102       // convert to internal name
 103       className = className.replace('.', '/');
 104       ClassLoaderDataGraph cldg = VM.getVM().getClassLoaderDataGraph();
 105 
 106       // check whether we have a class of given name
 107       Klass klass = cldg.find(className);
 108       if (klass != null && klass instanceof InstanceKlass) {
 109          return (InstanceKlass) klass;
 110       } else {
 111         // no match ..
 112         return null;
 113       }
 114    }
 115 }