Josiah Gaskin | 8a39da8 | 2011-06-06 17:00:35 -0700 | [diff] [blame] | 1 | // |
| 2 | // Copyright 2011 The Android Open Source Project |
| 3 | // |
| 4 | // Implementation file for CrunchCache |
| 5 | // This file defines functions laid out and documented in |
| 6 | // CrunchCache.h |
| 7 | |
| 8 | #include <utils/Vector.h> |
| 9 | #include <utils/String8.h> |
| 10 | |
| 11 | #include "DirectoryWalker.h" |
| 12 | #include "FileFinder.h" |
| 13 | #include "CacheUpdater.h" |
| 14 | #include "CrunchCache.h" |
| 15 | |
| 16 | using namespace android; |
| 17 | |
| 18 | CrunchCache::CrunchCache(String8 sourcePath, String8 destPath, FileFinder* ff) |
| 19 | : mSourcePath(sourcePath), mDestPath(destPath), mSourceFiles(0), mDestFiles(0), mFileFinder(ff) |
| 20 | { |
| 21 | // We initialize the default value to return to 0 so if a file doesn't exist |
| 22 | // then all files are automatically "newer" than it. |
| 23 | |
| 24 | // Set file extensions to look for. Right now just pngs. |
| 25 | mExtensions.push(String8(".png")); |
| 26 | |
| 27 | // Load files into our data members |
| 28 | loadFiles(); |
| 29 | } |
| 30 | |
| 31 | size_t CrunchCache::crunch(CacheUpdater* cu, bool forceOverwrite) |
| 32 | { |
| 33 | size_t numFilesUpdated = 0; |
| 34 | |
| 35 | // Iterate through the source files and compare to cache. |
| 36 | // After processing a file, remove it from the source files and |
| 37 | // from the dest files. |
| 38 | // We're done when we're out of files in source. |
| 39 | String8 relativePath; |
| 40 | while (mSourceFiles.size() > 0) { |
| 41 | // Get the full path to the source file, then convert to a c-string |
| 42 | // and offset our beginning pointer to the length of the sourcePath |
| 43 | // This efficiently strips the source directory prefix from our path. |
| 44 | // Also, String8 doesn't have a substring method so this is what we've |
| 45 | // got to work with. |
| 46 | const char* rPathPtr = mSourceFiles.keyAt(0).string()+mSourcePath.length(); |
| 47 | // Strip leading slash if present |
| 48 | int offset = 0; |
| 49 | if (rPathPtr[0] == OS_PATH_SEPARATOR) |
| 50 | offset = 1; |
| 51 | relativePath = String8(rPathPtr + offset); |
| 52 | |
| 53 | if (forceOverwrite || needsUpdating(relativePath)) { |
| 54 | cu->processImage(mSourcePath.appendPathCopy(relativePath), |
| 55 | mDestPath.appendPathCopy(relativePath)); |
| 56 | numFilesUpdated++; |
| 57 | // crunchFile(relativePath); |
| 58 | } |
| 59 | // Delete this file from the source files and (if it exists) from the |
| 60 | // dest files. |
| 61 | mSourceFiles.removeItemsAt(0); |
| 62 | mDestFiles.removeItem(mDestPath.appendPathCopy(relativePath)); |
| 63 | } |
| 64 | |
| 65 | // Iterate through what's left of destFiles and delete leftovers |
| 66 | while (mDestFiles.size() > 0) { |
| 67 | cu->deleteFile(mDestFiles.keyAt(0)); |
| 68 | mDestFiles.removeItemsAt(0); |
| 69 | } |
| 70 | |
| 71 | // Update our knowledge of the files cache |
| 72 | // both source and dest should be empty by now. |
| 73 | loadFiles(); |
| 74 | |
| 75 | return numFilesUpdated; |
| 76 | } |
| 77 | |
| 78 | void CrunchCache::loadFiles() |
| 79 | { |
| 80 | // Clear out our data structures to avoid putting in duplicates |
| 81 | mSourceFiles.clear(); |
| 82 | mDestFiles.clear(); |
| 83 | |
| 84 | // Make a directory walker that points to the system. |
| 85 | DirectoryWalker* dw = new SystemDirectoryWalker(); |
| 86 | |
| 87 | // Load files in the source directory |
| 88 | mFileFinder->findFiles(mSourcePath, mExtensions, mSourceFiles,dw); |
| 89 | |
| 90 | // Load files in the destination directory |
| 91 | mFileFinder->findFiles(mDestPath,mExtensions,mDestFiles,dw); |
| 92 | |
| 93 | delete dw; |
| 94 | } |
| 95 | |
| 96 | bool CrunchCache::needsUpdating(String8 relativePath) const |
| 97 | { |
| 98 | // Retrieve modification dates for this file entry under the source and |
| 99 | // cache directory trees. The vectors will return a modification date of 0 |
| 100 | // if the file doesn't exist. |
| 101 | time_t sourceDate = mSourceFiles.valueFor(mSourcePath.appendPathCopy(relativePath)); |
| 102 | time_t destDate = mDestFiles.valueFor(mDestPath.appendPathCopy(relativePath)); |
| 103 | return sourceDate > destDate; |
Andreas Gampe | 2412f84 | 2014-09-30 20:55:57 -0700 | [diff] [blame] | 104 | } |