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1//
2// Copyright 2011 The Android Open Source Project
3//
4// Abstraction of calls to system to make directories and delete files and
5// wrapper to image processing.
6
7#ifndef CACHE_UPDATER_H
8#define CACHE_UPDATER_H
9
10#include <utils/String8.h>
11#include <sys/types.h>
12#include <sys/stat.h>
13#include <stdio.h>
14#include "Images.h"
15
16using namespace android;
17
18/** CacheUpdater
19 * This is a pure virtual class that declares abstractions of functions useful
20 * for managing a cache files. This manager is set up to be used in a
21 * mirror cache where the source tree is duplicated and filled with processed
22 * images. This class is abstracted to allow for dependency injection during
23 * unit testing.
24 * Usage:
25 * To update/add a file to the cache, call processImage
26 * To remove a file from the cache, call deleteFile
27 */
28class CacheUpdater {
29public:
30 // Make sure all the directories along this path exist
31 virtual void ensureDirectoriesExist(String8 path) = 0;
32
33 // Delete a file
34 virtual void deleteFile(String8 path) = 0;
35
36 // Process an image from source out to dest
37 virtual void processImage(String8 source, String8 dest) = 0;
38private:
39};
40
41/** SystemCacheUpdater
42 * This is an implementation of the above virtual cache updater specification.
43 * This implementations hits the filesystem to manage a cache and calls out to
44 * the PNG crunching in images.h to process images out to its cache components.
45 */
46class SystemCacheUpdater : public CacheUpdater {
47public:
48 // Constructor to set bundle to pass to preProcessImage
49 SystemCacheUpdater (Bundle* b)
50 : bundle(b) { };
51
52 // Make sure all the directories along this path exist
53 virtual void ensureDirectoriesExist(String8 path)
54 {
55 // Check to see if we're dealing with a fully qualified path
56 String8 existsPath;
57 String8 toCreate;
58 String8 remains;
59 struct stat s;
60
61 // Check optomistically to see if all directories exist.
62 // If something in the path doesn't exist, then walk the path backwards
63 // and find the place to start creating directories forward.
64 if (stat(path.string(),&s) == -1) {
65 // Walk backwards to find place to start creating directories
66 existsPath = path;
67 do {
68 // As we remove the end of existsPath add it to
69 // the string of paths to create.
70 toCreate = existsPath.getPathLeaf().appendPath(toCreate);
71 existsPath = existsPath.getPathDir();
72 } while (stat(existsPath.string(),&s) == -1);
73
74 // Walk forwards and build directories as we go
75 do {
76 // Advance to the next segment of the path
77 existsPath.appendPath(toCreate.walkPath(&remains));
78 toCreate = remains;
79#ifdef HAVE_MS_C_RUNTIME
80 _mkdir(existsPath.string());
81#else
82 mkdir(existsPath.string(), S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IXGRP);
83#endif
84 } while (remains.length() > 0);
85 } //if
86 };
87
88 // Delete a file
89 virtual void deleteFile(String8 path)
90 {
91 if (remove(path.string()) != 0)
92 fprintf(stderr,"ERROR DELETING %s\n",path.string());
93 };
94
95 // Process an image from source out to dest
96 virtual void processImage(String8 source, String8 dest)
97 {
98 // Make sure we're trying to write to a directory that is extant
99 ensureDirectoriesExist(dest.getPathDir());
100
101 preProcessImageToCache(bundle, source, dest);
102 };
103private:
104 Bundle* bundle;
105};
106
107#endif // CACHE_UPDATER_H