Mercurial > hg > Members > kono > jpf-core

annotate src/classes/java/lang/ClassLoader.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18 package java.lang;
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19
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20 import java.io.IOException;
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21 import java.io.InputStream;
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22 import java.net.MalformedURLException;
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23 import java.net.URL;
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24 import java.nio.ByteBuffer;
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25 import java.security.ProtectionDomain;
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26 import java.util.Enumeration;
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27 import java.util.Vector;
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28
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29 import sun.misc.CompoundEnumeration;
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30
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31 /**
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32 * @author Nastaran Shafiei <nastaran.shafiei@gmail.com>
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33 *
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34 * Model class for java.lang.ClassLoader
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35 */
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36 public abstract class ClassLoader {
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37
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38 private ClassLoader parent;
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39
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40 // This is JPF internal identifier which set to the globalId of the classLoader
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41 private int nativeId;
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42
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43 //--- internals
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44
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45 protected ClassLoader() {
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46 // constructed on the native side
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47 }
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48
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49 protected ClassLoader (ClassLoader parent){
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50 // constructed on the native side
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51 }
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52
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53 private native String getResource0 (String rname);
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54
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55 public URL getResource(String name) {
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56 URL url = null;
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57
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58 if(parent == null) {
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59 String resourcePath = getSystemClassLoader().getResource0(name);
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60 try {
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61 url = new URL(resourcePath);
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62 } catch (MalformedURLException x){
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63 url = null;
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64 }
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65 } else {
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66 url = parent.getResource(name);
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67 }
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68
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69 if (url == null) {
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70 url = findResource(name);
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71 }
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72 return url;
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73 }
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74
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75 /**
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76 * Finds the resource with the given name. Class loader implementations
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77 * should override this method to specify where to find resources.
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78 */
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79 protected URL findResource(String name) {
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80 return null;
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81 }
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82
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83 private native String[] getResources0 (String rname);
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84
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85 /**
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86 * Returns an array of URL including all resources with the given name
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87 * found in the classpath of this classloader.
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88 */
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89 private Enumeration<URL> getResourcesURL(String name) {
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90 String[] urls = getResources0(name);
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91 Vector<URL> list = new Vector<URL>(0);
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92 for(String url: urls) {
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93 try {
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94 list.add(new URL(url));
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95 } catch (MalformedURLException x){
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96 // process the rest
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97 }
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98 }
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99
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100 return list.elements();
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101 }
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102
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103 @SuppressWarnings({"unchecked","rawtypes"})
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104 public Enumeration<URL> getResources(String name) throws IOException {
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105 Enumeration<URL>[] resEnum = new Enumeration[2];
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106
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107 if(parent == null) {
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108 resEnum[0] = getSystemClassLoader().getResourcesURL(name);
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109 } else{
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110 resEnum[0] = parent.getResources(name);
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111 }
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112 resEnum[1] = findResources(name);
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113
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114 return new CompoundEnumeration<URL>(resEnum);
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115 }
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116
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117 /**
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118 * Returns an enumeration representing all the resources with the given
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119 * name. Class loader implementations should override this method to
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120 * specify where to load resources from.
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121 */
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122 protected Enumeration<URL> findResources(String name) throws IOException {
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123 return (new Vector<URL>()).elements();
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124 }
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125
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126 public InputStream getResourceAsStream (String name){
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127 URL foundResource = getResource(name);
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128 if (foundResource != null) {
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129 try {
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130 return foundResource.openStream();
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131 } catch (IOException e) {
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132 System.err.println("cannot open resource " + name);
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133 }
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134 }
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135 return null;
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136 }
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137
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138 public native static ClassLoader getSystemClassLoader ();
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139
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140 public static URL getSystemResource(String name){
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141 return getSystemClassLoader().getResource(name);
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142 }
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143
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144 public static InputStream getSystemResourceAsStream(String name) {
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145 return getSystemClassLoader().getResourceAsStream(name);
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146 }
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147
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148 public static Enumeration<URL> getSystemResources(String name) throws IOException {
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149 return getSystemClassLoader().getResources(name);
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150 }
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151
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152 public ClassLoader getParent() {
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153 return parent;
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154 }
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155
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156 /**
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157 * If the class with the given name has been already defined, it is returned. OW, it
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158 * returns null.
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159 */
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160 protected native final Class<?> findLoadedClass(String name);
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161
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162 protected native final Class<?> findSystemClass(String name) throws ClassNotFoundException;
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163
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164 public Class<?> loadClass(String name) throws ClassNotFoundException {
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165 Class<?> c = findLoadedClass(name);
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166
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167 if(c == null) {
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168 try {
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169 if (parent != null && parent != getSystemClassLoader()) {
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170 c = parent.loadClass(name, false);
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171 } else {
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172 c = findSystemClass(name);
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173 }
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174 } catch (ClassNotFoundException e) {
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175 c = findClass(name);
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176 }
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177 }
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178
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179 return c;
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180 }
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181
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182 protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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183 return loadClass(name);
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184 }
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185
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186 /**
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187 * Finds the class with a given name. This method should be overridden by
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188 * ClassLoader subclasses, and it will be used by loadClass().
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189 */
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190 protected Class<?> findClass(String name) throws ClassNotFoundException {
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191 throw new ClassNotFoundException(name);
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192 }
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193
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194 /**
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195 * All the class objects are resolved internally by JPF. So this method
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196 * does nothing.
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197 */
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198 protected final void resolveClass(Class<?> c) {
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199 }
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200
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201 private native Class<?> defineClass0(String name, byte[] b, int off, int len);
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202
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203 protected final Class<?> defineClass(String name, byte[] b, int off, int len) throws ClassFormatError {
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204 return defineClass0(name, b, off, len);
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205 }
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206
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207 protected final Class<?> defineClass(String name, byte[] b, int off, int len, ProtectionDomain protectionDomain) throws ClassFormatError {
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208 return defineClass(name, b, off, len);
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209 }
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210
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211 protected String findLibrary(String libname) {
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212 return null;
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213 }
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214
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215 protected native Package getPackage(String name);
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216
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217 protected native Package[] getPackages();
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218
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219 public native void setDefaultAssertionStatus(boolean enabled);
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220
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221 public native void setClassAssertionStatus(String className, boolean enabled);
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222
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223 public native void setPackageAssertionStatus(String packageName, boolean enabled);
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224
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225 public native void clearAssertionStatus();
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226
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227 //--- unsupported methods
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228
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229 protected static boolean registerAsParallelCapable() {
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230 return true; // dummy, in prep for jdk7
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231 }
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232
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233 protected Object getClassLoadingLock(String className) {
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234 throw new UnsupportedOperationException();
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235 }
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236
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237 protected final Class<?> defineClass(byte[] b, int off, int len)
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238 throws ClassFormatError {
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239 throw new UnsupportedOperationException();
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240 }
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241
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242 protected final Class<?> defineClass(String name, ByteBuffer b, ProtectionDomain protectionDomain)
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243 throws ClassFormatError {
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244 throw new UnsupportedOperationException();
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245 }
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246
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247 protected final void setSigners(Class<?> c, Object[] signers) {
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248 throw new UnsupportedOperationException();
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249 }
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250
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251 protected Package definePackage(String name, String specTitle, String specVersion,
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252 String specVendor, String implTitle, String implVersion,
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253 String implVendor, URL sealBase)
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254 throws IllegalArgumentException {
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255 throw new UnsupportedOperationException();
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256 }
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257 }