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 android.content.Context;
20import android.os.StatFs;
21
22import com.android.gallery3d.app.AbstractGalleryActivity;
23import com.android.gallery3d.util.ThreadPool.JobContext;
24
25import java.io.File;
26
27public class CacheStorageUsageInfo {
28    @SuppressWarnings("unused")
29    private static final String TAG = "CacheStorageUsageInfo";
30
31    // number of bytes the storage has.
32    private long mTotalBytes;
33
34    // number of bytes already used.
35    private long mUsedBytes;
36
37    // number of bytes used for the cache (should be less then usedBytes).
38    private long mUsedCacheBytes;
39
40    // number of bytes used for the cache if all pending downloads (and removals) are completed.
41    private long mTargetCacheBytes;
42
43    private AbstractGalleryActivity mActivity;
44    private Context mContext;
45    private long mUserChangeDelta;
46
47    public CacheStorageUsageInfo(AbstractGalleryActivity activity) {
48        mActivity = activity;
49        mContext = activity.getAndroidContext();
50    }
51
52    public void increaseTargetCacheSize(long delta) {
53        mUserChangeDelta += delta;
54    }
55
56    public void loadStorageInfo(JobContext jc) {
57        File cacheDir = mContext.getExternalCacheDir();
58        if (cacheDir == null) {
59            cacheDir = mContext.getCacheDir();
60        }
61
62        String path = cacheDir.getAbsolutePath();
63        StatFs stat = new StatFs(path);
64        long blockSize = stat.getBlockSize();
65        long availableBlocks = stat.getAvailableBlocks();
66        long totalBlocks = stat.getBlockCount();
67
68        mTotalBytes = blockSize * totalBlocks;
69        mUsedBytes = blockSize * (totalBlocks - availableBlocks);
70        mUsedCacheBytes = mActivity.getDataManager().getTotalUsedCacheSize();
71        mTargetCacheBytes = mActivity.getDataManager().getTotalTargetCacheSize();
72    }
73
74    public long getTotalBytes() {
75        return mTotalBytes;
76    }
77
78    public long getExpectedUsedBytes() {
79        return mUsedBytes - mUsedCacheBytes + mTargetCacheBytes + mUserChangeDelta;
80    }
81
82    public long getUsedBytes() {
83        // Should it be usedBytes - usedCacheBytes + targetCacheBytes ?
84        return mUsedBytes;
85    }
86
87    public long getFreeBytes() {
88        return mTotalBytes - mUsedBytes;
89    }
90}
91