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113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef _nsNewsSet_H_
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#define _nsNewsSet_H_
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// msg_NewsArtSet represents a set of articles. Typically, it is the set of
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// read articles from a .newsrc file, but it can be used for other purposes
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// too.
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// If a MSG_NewsHost* is supplied to the creation routine, then that
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// MSG_NewsHost will be notified whwnever a change is made to set.
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class MSG_NewsHost;
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class nsNewsSet {
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public:
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// Creates an empty set.
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static nsNewsSet* Create(MSG_NewsHost* host = NULL);
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// Creates a set from the list of numbers, as might be found in a
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// newsrc file.
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static nsNewsSet* Create(const char* str, MSG_NewsHost* host = NULL);
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~nsNewsSet();
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// FirstNonMember() returns the lowest non-member of the set that is
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// greater than 0.
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PRInt32 FirstNonMember();
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// Output() converts to a string representation suitable for writing to a
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// .newsrc file. (The result must be freed by the caller using delete[].)
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char* Output();
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// IsMember() returns whether the given article is a member of this set.
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PRBool IsMember(PRInt32 art);
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// Add() adds the given article to the set. (Returns 1 if a change was
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// made, 0 if it was already there, and negative on error.)
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int Add(PRInt32 art);
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// Remove() removes the given article from the set.
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int Remove(PRInt32 art);
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// AddRange() adds the (inclusive) given range of articles to the set.
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int AddRange(PRInt32 first, PRInt32 last);
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// CountMissingInRange() takes an inclusive range of articles and returns
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// the number of articles in that range which are not in the set.
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PRInt32 CountMissingInRange(PRInt32 start, PRInt32 end);
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// FirstMissingRange() takes an inclusive range and finds the first range
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// of articles that are not in the set. If none, return zeros.
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int FirstMissingRange(PRInt32 min, PRInt32 max, PRInt32* first, PRInt32* last);
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// LastMissingRange() takes an inclusive range and finds the last range
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// of articles that are not in the set. If none, return zeros.
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int LastMissingRange(PRInt32 min, PRInt32 max, PRInt32* first, PRInt32* last);
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PRInt32 GetLastMember();
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PRInt32 GetFirstMember();
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void SetLastMember(PRInt32 highWaterMark);
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// For debugging only...
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PRInt32 getLength() {return m_length;}
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#ifdef DEBUG
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static void RunTests();
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#endif
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protected:
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nsNewsSet(MSG_NewsHost* host);
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nsNewsSet(const char*, MSG_NewsHost* host);
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PRBool Grow();
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PRBool Optimize();
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#ifdef DEBUG
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static void test_decoder(const char*);
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static void test_adder();
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static void test_ranges();
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static void test_member(PRBool with_cache);
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#endif
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PRInt32 *m_data; /* the numbers composing the `chunks' */
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PRInt32 m_data_size; /* size of that malloc'ed block */
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PRInt32 m_length; /* active area */
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PRInt32 m_cached_value; /* a potential set member, or -1 if unset*/
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PRInt32 m_cached_value_index; /* the index into `data' at which a search
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to determine whether `cached_value' was
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a member of the set ended. */
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#ifdef NEWSRC_DOES_HOST_STUFF
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MSG_NewsHost* m_host;
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#endif
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};
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#endif /* _nsNewsSet_H_ */
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