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      1 /*
      2  * Copyright (C) 2006 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 
     17 //
     18 // Access a chunk of the asset hierarchy as if it were a single directory.
     19 //
     20 #ifndef __LIBS_ASSETDIR_H
     21 #define __LIBS_ASSETDIR_H
     22 
     23 #include <utils/String8.h>
     24 #include <utils/Vector.h>
     25 #include <utils/SortedVector.h>
     26 #include <utils/misc.h>
     27 #include <sys/types.h>
     28 
     29 namespace android {
     30 
     31 /*
     32  * This provides vector-style access to a directory.  We do this rather
     33  * than modeling opendir/readdir access because it's simpler and the
     34  * nature of the operation requires us to have all data on hand anyway.
     35  *
     36  * The list of files will be sorted in ascending order by ASCII value.
     37  *
     38  * The contents are populated by our friend, the AssetManager.
     39  */
     40 class AssetDir {
     41 public:
     42     AssetDir(void)
     43         : mFileInfo(NULL)
     44         {}
     45     virtual ~AssetDir(void) {
     46         delete mFileInfo;
     47     }
     48 
     49     /*
     50      * Vector-style access.
     51      */
     52     size_t getFileCount(void) { return mFileInfo->size(); }
     53     const String8& getFileName(int idx) {
     54         return mFileInfo->itemAt(idx).getFileName();
     55     }
     56     const String8& getSourceName(int idx) {
     57         return mFileInfo->itemAt(idx).getSourceName();
     58     }
     59 
     60     /*
     61      * Get the type of a file (usually regular or directory).
     62      */
     63     FileType getFileType(int idx) {
     64         return mFileInfo->itemAt(idx).getFileType();
     65     }
     66 
     67 private:
     68     /* these operations are not implemented */
     69     AssetDir(const AssetDir& src);
     70     const AssetDir& operator=(const AssetDir& src);
     71 
     72     friend class AssetManager;
     73 
     74     /*
     75      * This holds information about files in the asset hierarchy.
     76      */
     77     class FileInfo {
     78     public:
     79         FileInfo(void) {}
     80         FileInfo(const String8& path)      // useful for e.g. svect.indexOf
     81             : mFileName(path), mFileType(kFileTypeUnknown)
     82             {}
     83         ~FileInfo(void) {}
     84         FileInfo(const FileInfo& src) {
     85             copyMembers(src);
     86         }
     87         const FileInfo& operator= (const FileInfo& src) {
     88             if (this != &src)
     89                 copyMembers(src);
     90             return *this;
     91         }
     92 
     93         void copyMembers(const FileInfo& src) {
     94             mFileName = src.mFileName;
     95             mFileType = src.mFileType;
     96             mSourceName = src.mSourceName;
     97         }
     98 
     99         /* need this for SortedVector; must compare only on file name */
    100         bool operator< (const FileInfo& rhs) const {
    101             return mFileName < rhs.mFileName;
    102         }
    103 
    104         /* used by AssetManager */
    105         bool operator== (const FileInfo& rhs) const {
    106             return mFileName == rhs.mFileName;
    107         }
    108 
    109         void set(const String8& path, FileType type) {
    110             mFileName = path;
    111             mFileType = type;
    112         }
    113 
    114         const String8& getFileName(void) const { return mFileName; }
    115         void setFileName(const String8& path) { mFileName = path; }
    116 
    117         FileType getFileType(void) const { return mFileType; }
    118         void setFileType(FileType type) { mFileType = type; }
    119 
    120         const String8& getSourceName(void) const { return mSourceName; }
    121         void setSourceName(const String8& path) { mSourceName = path; }
    122 
    123         /*
    124          * Handy utility for finding an entry in a sorted vector of FileInfo.
    125          * Returns the index of the matching entry, or -1 if none found.
    126          */
    127         static int findEntry(const SortedVector<FileInfo>* pVector,
    128             const String8& fileName);
    129 
    130     private:
    131         String8    mFileName;      // filename only
    132         FileType    mFileType;      // regular, directory, etc
    133 
    134         String8    mSourceName;    // currently debug-only
    135     };
    136 
    137     /* AssetManager uses this to initialize us */
    138     void setFileList(SortedVector<FileInfo>* list) { mFileInfo = list; }
    139 
    140     SortedVector<FileInfo>* mFileInfo;
    141 };
    142 
    143 }; // namespace android
    144 
    145 #endif // __LIBS_ASSETDIR_H
    146