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1//
2// Copyright 2011 The Android Open Source Project
3//
4// Defines an abstraction for opening a directory on the filesystem and
5// iterating through it.
6
7#ifndef DIRECTORYWALKER_H
8#define DIRECTORYWALKER_H
9
10#include <dirent.h>
11#include <sys/types.h>
12#include <sys/param.h>
13#include <sys/stat.h>
14#include <unistd.h>
15#include <utils/String8.h>
16
17#include <stdio.h>
18
19using namespace android;
20
21// Directory Walker
22// This is an abstraction for walking through a directory and getting files
23// and descriptions.
24
25class DirectoryWalker {
26public:
27 virtual ~DirectoryWalker() {};
28 virtual bool openDir(String8 path) = 0;
29 virtual bool openDir(const char* path) = 0;
30 // Advance to next directory entry
31 virtual struct dirent* nextEntry() = 0;
32 // Get the stats for the current entry
33 virtual struct stat* entryStats() = 0;
34 // Clean Up
35 virtual void closeDir() = 0;
36 // This class is able to replicate itself on the heap
37 virtual DirectoryWalker* clone() = 0;
38
39 // DATA MEMBERS
40 // Current directory entry
41 struct dirent mEntry;
42 // Stats for that directory entry
43 struct stat mStats;
44 // Base path
45 String8 mBasePath;
46};
47
48// System Directory Walker
49// This is an implementation of the above abstraction that calls
50// real system calls and is fully functional.
51// functions are inlined since they're very short and simple
52
53class SystemDirectoryWalker : public DirectoryWalker {
54
55 // Default constructor, copy constructor, and destructor are fine
56public:
57 virtual bool openDir(String8 path) {
58 mBasePath = path;
59 dir = NULL;
60 dir = opendir(mBasePath.string() );
61
62 if (dir == NULL)
63 return false;
64
65 return true;
66 };
67 virtual bool openDir(const char* path) {
68 String8 p(path);
69 openDir(p);
70 return true;
71 };
72 // Advance to next directory entry
73 virtual struct dirent* nextEntry() {
74 struct dirent* entryPtr = readdir(dir);
75 if (entryPtr == NULL)
76 return NULL;
77
78 mEntry = *entryPtr;
79 // Get stats
80 String8 fullPath = mBasePath.appendPathCopy(mEntry.d_name);
81 stat(fullPath.string(),&mStats);
82 return &mEntry;
83 };
84 // Get the stats for the current entry
85 virtual struct stat* entryStats() {
86 return &mStats;
87 };
88 virtual void closeDir() {
89 closedir(dir);
90 };
91 virtual DirectoryWalker* clone() {
92 return new SystemDirectoryWalker(*this);
93 };
94private:
95 DIR* dir;
96};
97
98#endif // DIRECTORYWALKER_H