1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.webkit; 18 19 import java.io.File; 20 import java.io.IOException; 21 import java.io.InputStream; 22 import java.io.OutputStream; 23 import java.util.Map; 24 25 26 /** 27 * Manages the HTTP cache used by an application's {@link WebView} instances. 28 * @deprecated Access to the HTTP cache will be removed in a future release. 29 * @hide Since {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1} 30 */ 31 // The class CacheManager provides the persistent cache of content that is 32 // received over the network. The component handles parsing of HTTP headers and 33 // utilizes the relevant cache headers to determine if the content should be 34 // stored and if so, how long it is valid for. Network requests are provided to 35 // this component and if they can not be resolved by the cache, the HTTP headers 36 // are attached, as appropriate, to the request for revalidation of content. The 37 // class also manages the cache size. 38 // 39 // CacheManager may only be used if your activity contains a WebView. 40 @Deprecated 41 public final class CacheManager { 42 /** 43 * Represents a resource stored in the HTTP cache. Instances of this class 44 * can be obtained by calling 45 * {@link CacheManager#getCacheFile CacheManager.getCacheFile(String, Map<String, String>))}. 46 * 47 * @deprecated Access to the HTTP cache will be removed in a future release. 48 */ 49 @Deprecated 50 public static class CacheResult { 51 // these fields are saved to the database 52 int httpStatusCode; 53 long contentLength; 54 long expires; 55 String expiresString; 56 String localPath; 57 String lastModified; 58 String etag; 59 String mimeType; 60 String location; 61 String encoding; 62 String contentdisposition; 63 String crossDomain; 64 65 // these fields are NOT saved to the database 66 InputStream inStream; 67 OutputStream outStream; 68 File outFile; 69 70 /** 71 * Gets the status code of this cache entry. 72 * 73 * @return the status code of this cache entry 74 */ 75 public int getHttpStatusCode() { 76 return httpStatusCode; 77 } 78 79 /** 80 * Gets the content length of this cache entry. 81 * 82 * @return the content length of this cache entry 83 */ 84 public long getContentLength() { 85 return contentLength; 86 } 87 88 /** 89 * Gets the path of the file used to store the content of this cache 90 * entry, relative to the base directory of the cache. See 91 * {@link CacheManager#getCacheFileBaseDir CacheManager.getCacheFileBaseDir()}. 92 * 93 * @return the path of the file used to store this cache entry 94 */ 95 public String getLocalPath() { 96 return localPath; 97 } 98 99 /** 100 * Gets the expiry date of this cache entry, expressed in milliseconds 101 * since midnight, January 1, 1970 UTC. 102 * 103 * @return the expiry date of this cache entry 104 */ 105 public long getExpires() { 106 return expires; 107 } 108 109 /** 110 * Gets the expiry date of this cache entry, expressed as a string. 111 * 112 * @return the expiry date of this cache entry 113 * 114 */ 115 public String getExpiresString() { 116 return expiresString; 117 } 118 119 /** 120 * Gets the date at which this cache entry was last modified, expressed 121 * as a string. 122 * 123 * @return the date at which this cache entry was last modified 124 */ 125 public String getLastModified() { 126 return lastModified; 127 } 128 129 /** 130 * Gets the entity tag of this cache entry. 131 * 132 * @return the entity tag of this cache entry 133 */ 134 public String getETag() { 135 return etag; 136 } 137 138 /** 139 * Gets the MIME type of this cache entry. 140 * 141 * @return the MIME type of this cache entry 142 */ 143 public String getMimeType() { 144 return mimeType; 145 } 146 147 /** 148 * Gets the value of the HTTP 'Location' header with which this cache 149 * entry was received. 150 * 151 * @return the HTTP 'Location' header for this cache entry 152 */ 153 public String getLocation() { 154 return location; 155 } 156 157 /** 158 * Gets the encoding of this cache entry. 159 * 160 * @return the encoding of this cache entry 161 */ 162 public String getEncoding() { 163 return encoding; 164 } 165 166 /** 167 * Gets the value of the HTTP 'Content-Disposition' header with which 168 * this cache entry was received. 169 * 170 * @return the HTTP 'Content-Disposition' header for this cache entry 171 * 172 */ 173 public String getContentDisposition() { 174 return contentdisposition; 175 } 176 177 /** 178 * Gets the input stream to the content of this cache entry, to allow 179 * content to be read. See 180 * {@link CacheManager#getCacheFile CacheManager.getCacheFile(String, Map<String, String>)}. 181 * 182 * @return an input stream to the content of this cache entry 183 */ 184 public InputStream getInputStream() { 185 return inStream; 186 } 187 188 /** 189 * Gets an output stream to the content of this cache entry, to allow 190 * content to be written. See 191 * {@link CacheManager#saveCacheFile CacheManager.saveCacheFile(String, CacheResult)}. 192 * 193 * @return an output stream to the content of this cache entry 194 */ 195 // Note that this is always null for objects returned by getCacheFile()! 196 public OutputStream getOutputStream() { 197 return outStream; 198 } 199 200 201 /** 202 * Sets an input stream to the content of this cache entry. 203 * 204 * @param stream an input stream to the content of this cache entry 205 */ 206 public void setInputStream(InputStream stream) { 207 this.inStream = stream; 208 } 209 210 /** 211 * Sets the encoding of this cache entry. 212 * 213 * @param encoding the encoding of this cache entry 214 */ 215 public void setEncoding(String encoding) { 216 this.encoding = encoding; 217 } 218 219 /** 220 * @hide 221 */ 222 public void setContentLength(long contentLength) { 223 this.contentLength = contentLength; 224 } 225 } 226 227 /** 228 * Gets the base directory in which the files used to store the contents of 229 * cache entries are placed. See 230 * {@link CacheManager.CacheResult#getLocalPath CacheManager.CacheResult.getLocalPath()}. 231 * 232 * @return the base directory of the cache 233 * @deprecated This method no longer has any effect and always returns null. 234 */ 235 @Deprecated 236 public static File getCacheFileBaseDir() { 237 return null; 238 } 239 240 /** 241 * Gets whether the HTTP cache is disabled. 242 * 243 * @return true if the HTTP cache is disabled 244 * @deprecated This method no longer has any effect and always returns false. 245 */ 246 @Deprecated 247 public static boolean cacheDisabled() { 248 return false; 249 } 250 251 /** 252 * Starts a cache transaction. Returns true if this is the only running 253 * transaction. Otherwise, this transaction is nested inside currently 254 * running transactions and false is returned. 255 * 256 * @return true if this is the only running transaction 257 * @deprecated This method no longer has any effect and always returns false. 258 */ 259 @Deprecated 260 public static boolean startCacheTransaction() { 261 return false; 262 } 263 264 /** 265 * Ends the innermost cache transaction and returns whether this was the 266 * only running transaction. 267 * 268 * @return true if this was the only running transaction 269 * @deprecated This method no longer has any effect and always returns false. 270 */ 271 @Deprecated 272 public static boolean endCacheTransaction() { 273 return false; 274 } 275 276 /** 277 * Gets the cache entry for the specified URL, or null if none is found. 278 * If a non-null value is provided for the HTTP headers map, and the cache 279 * entry needs validation, appropriate headers will be added to the map. 280 * The input stream of the CacheEntry object should be closed by the caller 281 * when access to the underlying file is no longer required. 282 * 283 * @param url the URL for which a cache entry is requested 284 * @param headers a map from HTTP header name to value, to be populated 285 * for the returned cache entry 286 * @return the cache entry for the specified URL 287 * @deprecated This method no longer has any effect and always returns null. 288 */ 289 @Deprecated 290 public static CacheResult getCacheFile(String url, 291 Map<String, String> headers) { 292 return null; 293 } 294 295 /** 296 * Adds a cache entry to the HTTP cache for the specicifed URL. Also closes 297 * the cache entry's output stream. 298 * 299 * @param url the URL for which the cache entry should be added 300 * @param cacheResult the cache entry to add 301 * @deprecated Access to the HTTP cache will be removed in a future release. 302 */ 303 @Deprecated 304 public static void saveCacheFile(String url, CacheResult cacheResult) { 305 saveCacheFile(url, 0, cacheResult); 306 } 307 308 static void saveCacheFile(String url, long postIdentifier, 309 CacheResult cacheRet) { 310 try { 311 cacheRet.outStream.close(); 312 } catch (IOException e) { 313 return; 314 } 315 316 // This method is exposed in the public API but the API provides no 317 // way to obtain a new CacheResult object with a non-null output 318 // stream ... 319 // - CacheResult objects returned by getCacheFile() have a null 320 // output stream. 321 // - new CacheResult objects have a null output stream and no 322 // setter is provided. 323 // Since this method throws a null pointer exception in this case, 324 // it is effectively useless from the point of view of the public 325 // API. 326 // 327 // With the Chromium HTTP stack we continue to throw the same 328 // exception for 'backwards compatibility' with the Android HTTP 329 // stack. 330 // 331 // This method is not used from within this package, and for public API 332 // use, we should already have thrown an exception above. 333 assert false; 334 } 335 } 336
