1 /* |
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2 * Copyright (c) 1998, 2009, Oracle and/or its affiliates. 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.misc; |
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27 |
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28 import java.io.EOFException; |
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29 import java.net.URL; |
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30 import java.io.IOException; |
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31 import java.io.InterruptedIOException; |
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32 import java.io.InputStream; |
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33 import java.security.CodeSigner; |
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34 import java.util.jar.Manifest; |
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35 import java.nio.ByteBuffer; |
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36 import java.util.Arrays; |
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37 import sun.nio.ByteBuffered; |
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38 |
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39 /** |
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40 * This class is used to represent a Resource that has been loaded |
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41 * from the class path. |
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42 * |
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43 * @author David Connelly |
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44 * @since 1.2 |
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45 */ |
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46 public abstract class Resource { |
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47 /** |
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48 * Returns the name of the Resource. |
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49 */ |
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50 public abstract String getName(); |
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51 |
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52 /** |
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53 * Returns the URL of the Resource. |
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54 */ |
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55 public abstract URL getURL(); |
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56 |
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57 /** |
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58 * Returns the CodeSource URL for the Resource. |
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59 */ |
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60 public abstract URL getCodeSourceURL(); |
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61 |
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62 /** |
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63 * Returns an InputStream for reading the Resource data. |
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64 */ |
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65 public abstract InputStream getInputStream() throws IOException; |
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66 |
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67 /** |
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68 * Returns the length of the Resource data, or -1 if unknown. |
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69 */ |
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70 public abstract int getContentLength() throws IOException; |
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71 |
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72 private InputStream cis; |
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73 |
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74 /* Cache result in case getBytes is called after getByteBuffer. */ |
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75 private synchronized InputStream cachedInputStream() throws IOException { |
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76 if (cis == null) { |
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77 cis = getInputStream(); |
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78 } |
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79 return cis; |
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80 } |
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81 |
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82 /** |
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83 * Returns the Resource data as an array of bytes. |
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84 */ |
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85 public byte[] getBytes() throws IOException { |
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86 byte[] b; |
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87 // Get stream before content length so that a FileNotFoundException |
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88 // can propagate upwards without being caught too early |
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89 InputStream in = cachedInputStream(); |
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90 |
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91 // This code has been uglified to protect against interrupts. |
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92 // Even if a thread has been interrupted when loading resources, |
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93 // the IO should not abort, so must carefully retry, failing only |
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94 // if the retry leads to some other IO exception. |
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95 |
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96 boolean isInterrupted = Thread.interrupted(); |
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97 int len; |
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98 for (;;) { |
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99 try { |
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100 len = getContentLength(); |
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101 break; |
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102 } catch (InterruptedIOException iioe) { |
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103 Thread.interrupted(); |
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104 isInterrupted = true; |
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105 } |
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106 } |
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107 |
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108 try { |
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109 b = new byte[0]; |
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110 if (len == -1) len = Integer.MAX_VALUE; |
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111 int pos = 0; |
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112 while (pos < len) { |
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113 int bytesToRead; |
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114 if (pos >= b.length) { // Only expand when there's no room |
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115 bytesToRead = Math.min(len - pos, b.length + 1024); |
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116 if (b.length < pos + bytesToRead) { |
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117 b = Arrays.copyOf(b, pos + bytesToRead); |
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118 } |
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119 } else { |
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120 bytesToRead = b.length - pos; |
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121 } |
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122 int cc = 0; |
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123 try { |
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124 cc = in.read(b, pos, bytesToRead); |
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125 } catch (InterruptedIOException iioe) { |
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126 Thread.interrupted(); |
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127 isInterrupted = true; |
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128 } |
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129 if (cc < 0) { |
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130 if (len != Integer.MAX_VALUE) { |
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131 throw new EOFException("Detect premature EOF"); |
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132 } else { |
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133 if (b.length != pos) { |
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134 b = Arrays.copyOf(b, pos); |
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135 } |
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136 break; |
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137 } |
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138 } |
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139 pos += cc; |
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140 } |
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141 } finally { |
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142 try { |
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143 in.close(); |
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144 } catch (InterruptedIOException iioe) { |
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145 isInterrupted = true; |
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146 } catch (IOException ignore) {} |
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147 |
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148 if (isInterrupted) { |
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149 Thread.currentThread().interrupt(); |
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150 } |
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151 } |
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152 return b; |
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153 } |
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154 |
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155 /** |
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156 * Returns the Resource data as a ByteBuffer, but only if the input stream |
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157 * was implemented on top of a ByteBuffer. Return {@code null} otherwise. |
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158 * @return Resource data or null. |
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159 */ |
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160 public ByteBuffer getByteBuffer() throws IOException { |
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161 InputStream in = cachedInputStream(); |
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162 if (in instanceof ByteBuffered) { |
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163 return ((ByteBuffered)in).getByteBuffer(); |
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164 } |
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165 return null; |
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166 } |
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167 |
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168 /** |
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169 * Returns the Manifest for the Resource, or null if none. |
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170 */ |
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171 public Manifest getManifest() throws IOException { |
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172 return null; |
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173 } |
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174 |
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175 /** |
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176 * Returns theCertificates for the Resource, or null if none. |
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177 */ |
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178 public java.security.cert.Certificate[] getCertificates() { |
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179 return null; |
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180 } |
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181 |
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182 /** |
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183 * Returns the code signers for the Resource, or null if none. |
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184 */ |
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185 public CodeSigner[] getCodeSigners() { |
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186 return null; |
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187 } |
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188 } |
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