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-rw-r--r--src/com/android/gallery3d/util/CacheManager.java82
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diff --git a/src/com/android/gallery3d/util/CacheManager.java b/src/com/android/gallery3d/util/CacheManager.java
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+/*
+ * 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");
+ }
+}