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81 lines
2.8 KiB
81 lines
2.8 KiB
//
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// Copyright 2011 The Android Open Source Project
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//
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// File Finder.
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// This is a collection of useful functions for finding paths and modification
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// times of files that match an extension pattern in a directory tree.
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// and finding files in it.
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#ifndef FILEFINDER_H
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#define FILEFINDER_H
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#include <utils/Vector.h>
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#include <utils/KeyedVector.h>
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#include <utils/String8.h>
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#include "DirectoryWalker.h"
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using namespace android;
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// Abstraction to allow for dependency injection. See MockFileFinder.h
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// for the testing implementation.
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class FileFinder {
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public:
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virtual bool findFiles(String8 basePath, Vector<String8>& extensions,
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KeyedVector<String8,time_t>& fileStore,
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DirectoryWalker* dw) = 0;
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virtual ~FileFinder() {};
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};
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class SystemFileFinder : public FileFinder {
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public:
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/* findFiles takes a path, a Vector of extensions, and a destination KeyedVector
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* and places path/modification date key/values pointing to
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* all files with matching extensions found into the KeyedVector
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* PRECONDITIONS
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* path is a valid system path
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* extensions should include leading "."
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* This is not necessary, but the comparison directly
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* compares the end of the path string so if the "."
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* is excluded there is a small chance you could have
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* a false positive match. (For example: extension "png"
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* would match a file called "blahblahpng")
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*
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* POSTCONDITIONS
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* fileStore contains (in no guaranteed order) paths to all
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* matching files encountered in subdirectories of path
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* as keys in the KeyedVector. Each key has the modification time
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* of the file as its value.
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*
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* Calls checkAndAddFile on each file encountered in the directory tree
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* Recursively descends into subdirectories.
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*/
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virtual bool findFiles(String8 basePath, Vector<String8>& extensions,
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KeyedVector<String8,time_t>& fileStore,
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DirectoryWalker* dw);
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private:
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/**
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* checkAndAddFile looks at a single file path and stat combo
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* to determine whether it is a matching file (by looking at
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* the extension)
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*
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* PRECONDITIONS
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* no setup is needed
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*
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* POSTCONDITIONS
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* If the given file has a matching extension then a new entry
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* is added to the KeyedVector with the path as the key and the modification
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* time as the value.
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*
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*/
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static void checkAndAddFile(const String8& path, const struct stat* stats,
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Vector<String8>& extensions,
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KeyedVector<String8,time_t>& fileStore);
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};
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#endif // FILEFINDER_H
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