1/*
2 * Copyright (C) 2010 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
17package com.android.gallery3d.ui;
18
19import com.android.gallery3d.app.GalleryActivity;
20import com.android.gallery3d.util.ThreadPool.JobContext;
21
22import android.content.Context;
23import android.os.StatFs;
24
25import java.io.File;
26
27public class CacheStorageUsageInfo {
28    private static final String TAG = "CacheStorageUsageInfo";
29
30    // number of bytes the storage has.
31    private long mTotalBytes;
32
33    // number of bytes already used.
34    private long mUsedBytes;
35
36    // number of bytes used for the cache (should be less then usedBytes).
37    private long mUsedCacheBytes;
38
39    // number of bytes used for the cache if all pending downloads (and removals) are completed.
40    private long mTargetCacheBytes;
41
42    private GalleryActivity mActivity;
43    private Context mContext;
44    private long mUserChangeDelta;
45
46    public CacheStorageUsageInfo(GalleryActivity activity) {
47        mActivity = activity;
48        mContext = activity.getAndroidContext();
49    }
50
51    public void increaseTargetCacheSize(long delta) {
52        mUserChangeDelta += delta;
53    }
54
55    public void loadStorageInfo(JobContext jc) {
56        File cacheDir = mContext.getExternalCacheDir();
57        if (cacheDir == null) {
58            cacheDir = mContext.getCacheDir();
59        }
60
61        String path = cacheDir.getAbsolutePath();
62        StatFs stat = new StatFs(path);
63        long blockSize = stat.getBlockSize();
64        long availableBlocks = stat.getAvailableBlocks();
65        long totalBlocks = stat.getBlockCount();
66
67        mTotalBytes = blockSize * totalBlocks;
68        mUsedBytes = blockSize * (totalBlocks - availableBlocks);
69        mUsedCacheBytes = mActivity.getDataManager().getTotalUsedCacheSize();
70        mTargetCacheBytes = mActivity.getDataManager().getTotalTargetCacheSize();
71    }
72
73    public long getTotalBytes() {
74        return mTotalBytes;
75    }
76
77    public long getExpectedUsedBytes() {
78        return mUsedBytes - mUsedCacheBytes + mTargetCacheBytes + mUserChangeDelta;
79    }
80
81    public long getUsedBytes() {
82        // Should it be usedBytes - usedCacheBytes + targetCacheBytes ?
83        return mUsedBytes;
84    }
85
86    public long getFreeBytes() {
87        return mTotalBytes - mUsedBytes;
88    }
89}
90