diff options
Diffstat (limited to 'src/com/android/gallery3d/util/CacheManager.java')
-rw-r--r-- | src/com/android/gallery3d/util/CacheManager.java | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/util/CacheManager.java b/src/com/android/gallery3d/util/CacheManager.java new file mode 100644 index 000000000..fcc444e98 --- /dev/null +++ b/src/com/android/gallery3d/util/CacheManager.java @@ -0,0 +1,82 @@ +/* + * Copyright (C) 2010 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package com.android.gallery3d.util; + +import com.android.gallery3d.common.BlobCache; + +import android.content.Context; +import android.content.SharedPreferences; +import android.preference.PreferenceManager; + +import java.io.File; +import java.io.IOException; +import java.util.HashMap; + +public class CacheManager { + private static final String TAG = "CacheManager"; + private static final String KEY_CACHE_UP_TO_DATE = "cache-up-to-date"; + private static HashMap<String, BlobCache> sCacheMap = + new HashMap<String, BlobCache>(); + private static boolean sOldCheckDone = false; + + // Return null when we cannot instantiate a BlobCache, e.g.: + // there is no SD card found. + // This can only be called from data thread. + public static BlobCache getCache(Context context, String filename, + int maxEntries, int maxBytes, int version) { + synchronized (sCacheMap) { + if (!sOldCheckDone) { + removeOldFilesIfNecessary(context); + sOldCheckDone = true; + } + BlobCache cache = sCacheMap.get(filename); + if (cache == null) { + File cacheDir = context.getExternalCacheDir(); + String path = cacheDir.getAbsolutePath() + "/" + filename; + try { + cache = new BlobCache(path, maxEntries, maxBytes, false, + version); + sCacheMap.put(filename, cache); + } catch (IOException e) { + Log.e(TAG, "Cannot instantiate cache!", e); + } + } + return cache; + } + } + + // Removes the old files if the data is wiped. + private static void removeOldFilesIfNecessary(Context context) { + SharedPreferences pref = PreferenceManager + .getDefaultSharedPreferences(context); + int n = 0; + try { + n = pref.getInt(KEY_CACHE_UP_TO_DATE, 0); + } catch (Throwable t) { + // ignore. + } + if (n != 0) return; + pref.edit().putInt(KEY_CACHE_UP_TO_DATE, 1).commit(); + + File cacheDir = context.getExternalCacheDir(); + String prefix = cacheDir.getAbsolutePath() + "/"; + + BlobCache.deleteFiles(prefix + "imgcache"); + BlobCache.deleteFiles(prefix + "rev_geocoding"); + BlobCache.deleteFiles(prefix + "bookmark"); + } +} |