haiku/headers/private/storage/MergedDirectory.h

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/*
* Copyright 2013, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Ingo Weinhold <ingo_weinhold@gmx.de>
*/
#ifndef _MERGED_DIRECTORY_H
#define _MERGED_DIRECTORY_H
#include <EntryList.h>
#include <ObjectList.h>
class BDirectory;
class BMergedDirectory : public BEntryList {
public:
// policy how to handle equally named entries in different
// directories
enum BPolicy {
B_ALLOW_DUPLICATES,
B_ALWAYS_FIRST,
B_COMPARE
};
public:
BMergedDirectory(
BPolicy policy = B_ALWAYS_FIRST);
virtual ~BMergedDirectory();
status_t Init();
BPolicy Policy() const;
void SetPolicy(BPolicy policy);
status_t AddDirectory(BDirectory* directory);
status_t AddDirectory(const char* path);
virtual status_t GetNextEntry(BEntry* entry,
bool traverse = false);
virtual status_t GetNextRef(entry_ref* ref);
virtual int32 GetNextDirents(struct dirent* direntBuffer,
size_t bufferSize,
int32 maxEntries = INT_MAX);
virtual status_t Rewind();
virtual int32 CountEntries();
protected:
virtual bool ShallPreferFirstEntry(const entry_ref& entry1,
int32 index1, const entry_ref& entry2,
int32 index2);
// always invoked with index1 < index2
private:
typedef BObjectList<BDirectory> DirectoryList;
struct EntryNameSet;
private:
void _FindBestEntry(dirent* direntBuffer);
private:
DirectoryList fDirectories;
BPolicy fPolicy;
int32 fDirectoryIndex;
EntryNameSet* fVisitedEntries;
};
#endif // _MERGED_DIRECTORY_H