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Provider for the application cache directories.
/**
* Copyright 2009, 2010 Kevin Gaudin
*
* This file is part of EmailAlbum.
*
* EmailAlbum is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* EmailAlbum is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with EmailAlbum. If not, see <http://www.gnu.org/licenses/>.
*/
package com.kg.emailalbum.mobile.util;
import java.io.File;
import java.io.IOException;
import android.content.Context;
import android.os.Environment;
import android.util.Log;
/**
* Provider for the application cache directories. If an external storage is
* available, use it, otherwise use the application context cache directory/
*
* @author Kevin Gaudin
*
*/
public class CacheManager {
private static final String LOG_TAG = CacheManager.class.getSimpleName();
private Context mContext = null;
public CacheManager(Context ctx) {
mContext = ctx;
}
/**
* Get the application cache root.
*
* @return The application cache root.
*/
public File getCacheDir() {
return getCacheDir(null);
}
/**
* Get a cache directory for a specific task.
*
* @param subdir
* The name of the task, will result as a subdirectory of the
* cache root.
* @return The cache directory for this task.
*/
public File getCacheDir(String subdir) {
if (subdir == null) {
subdir = "";
}
// Default root is the application context cache.
File result = new File(mContext.getCacheDir(), subdir);
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// If an external storage is available, use it as it will prevent
// from overloading the internal memory.
result = new File(Environment.getExternalStorageDirectory(),
"data/EmailAlbum/.cache/" + subdir);
}
// Physically create the directory (and its parents) if it does not
// exist.
if (!result.exists()) {
result.mkdirs();
}
File noMedia = new File(result, ".nomedia");
try {
noMedia.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.e(LOG_TAG, "Error : ", e);
}
// Log.i(LOG_TAG, "Using dir " + result + " for cache");
return result;
}
// Clear the whole application cache.
public void clearCache() {
clearCache(null);
}
// Clear only the cache of a specific task.
public void clearCache(String subdir) {
File cacheDir = getCacheDir(subdir);
if(cacheDir != null) {
String[] files = cacheDir.list();
if(files != null && files.length > 0) {
for (String cachedFile : getCacheDir(subdir).list()) {
deleteDirectory(new File(getCacheDir(subdir), cachedFile));
}
}
}
}
/**
* Delete a directory and all its content.
*
* @param path
* The directory to delete.
* @return
*/
static public int deleteDirectory(File path) {
int nbDeleted = 0;
if (path.exists() && path.isDirectory()) {
File[] files = path.listFiles();
for (int i = 0; i < files.length; i++) {
if (files[i].isDirectory()) {
nbDeleted += deleteDirectory(files[i]);
} else {
if(files[i].delete()) {
nbDeleted++;
}
}
}
} else if (path.exists()) {
if(path.delete()) {
nbDeleted++;
}
}
return nbDeleted;
}
public File getInboxDir() {
String subdir = "received";
// Default root is the application context internal files dir.
File result = new File(mContext.getFilesDir(), subdir);
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// If an external storage is available, use it as it will prevent
// from overloading the internal memory.
result = new File(Environment.getExternalStorageDirectory(),
"data/EmailAlbum/" + subdir);
}
// Physically create the directory (and its parents) if it does not
// exist.
if (!result.exists()) {
result.mkdirs();
}
// Log.i(LOG_TAG, "Using dir " + result + " for cache");
return result;
}
public File getOutboxDir() {
String subdir = "created";
// Default root is the application context internal files dir.
File result = new File(mContext.getFilesDir(), subdir);
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// If an external storage is available, use it as it will prevent
// from overloading the internal memory.
result = new File(Environment.getExternalStorageDirectory(),
"data/EmailAlbum/" + subdir);
}
// Physically create the directory (and its parents) if it does not
// exist.
if (!result.exists()) {
result.mkdirs();
}
// Log.i(LOG_TAG, "Using dir " + result + " for cache");
return result;
}
}
