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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef _nsMsgKeySet_H_
#define _nsMsgKeySet_H_
#include "msgCore.h"
#include "nsTArray.h"
// nsMsgKeySet represents a set of articles. Typically, it is the set of
// read articles from a .newsrc file, but it can be used for other purposes
// too.
#if 0
// If a MSG_NewsHost* is supplied to the creation routine, then that
// MSG_NewsHost will be notified whenever a change is made to set.
class MSG_NewsHost;
#endif
class NS_MSG_BASE nsMsgKeySet {
public:
// Creates an empty set.
static nsMsgKeySet* Create(/* MSG_NewsHost* host = NULL*/);
// Creates a set from the list of numbers, as might be found in a
// newsrc file.
static nsMsgKeySet* Create(const char* str/* , MSG_NewsHost* host = NULL*/);
~nsMsgKeySet();
// FirstNonMember() returns the lowest non-member of the set that is
// greater than 0.
int32_t FirstNonMember();
// Output() converts to a string representation suitable for writing to a
// .newsrc file.
nsresult Output(char **outputStr);
// IsMember() returns whether the given article is a member of this set.
bool IsMember(int32_t art);
// Add() adds the given article to the set. (Returns 1 if a change was
// made, 0 if it was already there, and negative on error.)
int Add(int32_t art);
// Remove() removes the given article from the set.
int Remove(int32_t art);
// AddRange() adds the (inclusive) given range of articles to the set.
int AddRange(int32_t first, int32_t last);
// CountMissingInRange() takes an inclusive range of articles and returns
// the number of articles in that range which are not in the set.
int32_t CountMissingInRange(int32_t start, int32_t end);
// FirstMissingRange() takes an inclusive range and finds the first range
// of articles that are not in the set. If none, return zeros.
int FirstMissingRange(int32_t min, int32_t max, int32_t* first, int32_t* last);
// LastMissingRange() takes an inclusive range and finds the last range
// of articles that are not in the set. If none, return zeros.
int LastMissingRange(int32_t min, int32_t max, int32_t* first, int32_t* last);
int32_t GetLastMember();
int32_t GetFirstMember();
void SetLastMember(int32_t highWaterMark);
// For debugging only...
int32_t getLength() {return m_length;}
/**
* Fill the passed in aArray with the keys in the message key set.
*/
nsresult ToMsgKeyArray(nsTArray<nsMsgKey> &aArray);
#ifdef DEBUG
static void RunTests();
#endif
protected:
nsMsgKeySet(/* MSG_NewsHost* host */);
explicit nsMsgKeySet(const char* /* , MSG_NewsHost* host */);
bool Grow();
bool Optimize();
#ifdef DEBUG
static void test_decoder(const char*);
static void test_adder();
static void test_ranges();
static void test_member(bool with_cache);
#endif
int32_t *m_data; /* the numbers composing the `chunks' */
int32_t m_data_size; /* size of that malloc'ed block */
int32_t m_length; /* active area */
int32_t m_cached_value; /* a potential set member, or -1 if unset*/
int32_t m_cached_value_index; /* the index into `data' at which a search
to determine whether `cached_value' was
a member of the set ended. */
#ifdef NEWSRC_DOES_HOST_STUFF
MSG_NewsHost* m_host;
#endif
};
#endif /* _nsMsgKeySet_H_ */
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