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1 /*
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2 * Copyright 2002-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.oops.*;
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29 import sun.jvm.hotspot.memory.*;
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30 import sun.jvm.hotspot.runtime.*;
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31
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32 public class SystemDictionaryHelper {
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33 static {
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34 VM.registerVMInitializedObserver(new Observer() {
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35 public void update(Observable o, Object data) {
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36 initialize();
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37 }
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38 });
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39 }
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40
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41 private static synchronized void initialize() {
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42 klasses = null;
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43 }
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44
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45 // Instance klass array sorted by name.
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46 private static InstanceKlass[] klasses;
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47
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48 // side-effect!. caches the instance klass array.
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49 public static synchronized InstanceKlass[] getAllInstanceKlasses() {
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50 if (klasses != null) {
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51 return klasses;
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52 }
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53
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54 final Vector tmp = new Vector();
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55 SystemDictionary dict = VM.getVM().getSystemDictionary();
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56 dict.classesDo(new SystemDictionary.ClassVisitor() {
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57 public void visit(Klass k) {
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58 if (k instanceof InstanceKlass) {
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59 InstanceKlass ik = (InstanceKlass) k;
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60 tmp.add(ik);
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61 }
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62 }
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63 });
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64
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65 Object[] tmpArray = tmp.toArray();
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66 klasses = new InstanceKlass[tmpArray.length];
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67 System.arraycopy(tmpArray, 0, klasses, 0, tmpArray.length);
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68 Arrays.sort(klasses, new Comparator() {
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69 public int compare(Object o1, Object o2) {
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70 InstanceKlass k1 = (InstanceKlass) o1;
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71 InstanceKlass k2 = (InstanceKlass) o2;
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72 Symbol s1 = k1.getName();
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73 Symbol s2 = k2.getName();
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74 return s1.asString().compareTo(s2.asString());
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75 }
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76 });
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77 return klasses;
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78 }
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79
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80 // returns array of instance klasses whose name contains given namePart
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81 public static InstanceKlass[] findInstanceKlasses(String namePart) {
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82 namePart = namePart.replace('.', '/');
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83 InstanceKlass[] tmpKlasses = getAllInstanceKlasses();
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84
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85 Vector tmp = new Vector();
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86 for (int i = 0; i < tmpKlasses.length; i++) {
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87 String name = tmpKlasses[i].getName().asString();
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88 if (name.indexOf(namePart) != -1) {
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89 tmp.add(tmpKlasses[i]);
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90 }
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91 }
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92
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93 Object[] tmpArray = tmp.toArray();
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94 InstanceKlass[] searchResult = new InstanceKlass[tmpArray.length];
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95 System.arraycopy(tmpArray, 0, searchResult, 0, tmpArray.length);
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96 return searchResult;
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97 }
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98
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99 // find first class whose name matches exactly the given argument.
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100 public static InstanceKlass findInstanceKlass(String className) {
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101 // convert to internal name
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102 className = className.replace('.', '/');
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103 SystemDictionary sysDict = VM.getVM().getSystemDictionary();
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104
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105 // check whether we have a bootstrap class of given name
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106 Klass klass = sysDict.find(className, null, null);
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107 if (klass != null) {
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108 return (InstanceKlass) klass;
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109 }
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110
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111 // check whether we have a system class of given name
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112 klass = sysDict.find(className, sysDict.javaSystemLoader(), null);
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113 if (klass != null) {
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114 return (InstanceKlass) klass;
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115 }
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116
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117 // didn't find bootstrap or system class of given name.
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118 // search through the entire dictionary..
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119 InstanceKlass[] tmpKlasses = getAllInstanceKlasses();
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120 // instance klass array is sorted by name. do binary search
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121 int low = 0;
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122 int high = tmpKlasses.length-1;
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123
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124 int mid = -1;
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125 while (low <= high) {
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126 mid = (low + high) >> 1;
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127 InstanceKlass midVal = tmpKlasses[mid];
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128 int cmp = midVal.getName().asString().compareTo(className);
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129
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130 if (cmp < 0) {
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131 low = mid + 1;
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132 } else if (cmp > 0) {
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133 high = mid - 1;
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134 } else { // match found
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135 return tmpKlasses[mid];
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136 }
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137 }
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138 // no match ..
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139 return null;
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140 }
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141 }
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