171 lines
4.9 KiB
C
171 lines
4.9 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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//%% (c) Copyright 1993, 1994 Hewlett-Packard Company
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//%% (c) Copyright 1993, 1994 International Business Machines Corp.
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//%% (c) Copyright 1993, 1994 Sun Microsystems, Inc.
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//%% (c) Copyright 1993, 1994 Novell, Inc.
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//%% $XConsortium: CoEdTextVersion.C /main/3 1995/10/23 09:43:59 rswiston $
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/*
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* CoEdTextVersion.cc
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*
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* Copyright (c) 1991 by Sun Microsystems. All Rights Reserved.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the names of Sun
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* Microsystems and its subsidiaries not be used in advertising or
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* publicity pertaining to distribution of the software without
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* specific, written prior permission. Sun Microsystems and its
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* subsidiaries make no representations about the suitability of this
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* software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*
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* Sun Microsystems and its subsidiaries disclaim all warranties with
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* regard to this software, including all implied warranties of
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* merchantability and fitness. In no event shall Sun Microsystems or
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* its subsidiaries be liable for any special, indirect or
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* consequential damages or any damages whatsoever resulting from loss
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* of use, data or profits, whether in an action of contract,
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* negligence or other tortious action, arising out of or in
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* connection with the use or performance of this software.
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*/
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#include "CoEdTextVersion.h"
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CoEdTextVersion::
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CoEdTextVersion() : SiteChangeList()
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{
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}
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CoEdTextVersion::
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CoEdTextVersion( unsigned char *data, int len, CoEdStatus &status )
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: SiteChangeList( data, len, status )
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{
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}
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void CoEdTextVersion::
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update( const CoEdSiteID &site, int numChanges )
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{
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SiteChange *curr = _head;
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int found = 0;
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while (curr != 0) {
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if ( *(CoEdSiteID *)curr == site ) {
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curr->_changeNum = numChanges;
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found = 1;
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}
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curr = (SiteChange *)curr->_next;
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}
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if (! found) {
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curr = new SiteChange( site, numChanges );
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insert( curr );
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}
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}
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CoEdTextVersion *CoEdTextVersion::
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copy() const
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{
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CoEdTextVersion *newVersion = new CoEdTextVersion;
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newVersion->SiteChangeList::copy( (const SiteChangeList *)this );
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return newVersion;
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}
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//
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// This method assumes that the CoEdSiteID of <change> is _not_ already
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// in the list of SiteChanges!
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//
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void CoEdTextVersion::
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insert( SiteChange *change )
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{
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SiteChange *curr = _head;
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int inserted = 0;
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while ((curr != 0) && (! inserted)) {
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if (*change < *curr) {
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insertBefore( change, curr );
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inserted = 1;
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}
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curr = (SiteChange *)curr->_next;
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}
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if (! inserted) {
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append( change );
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}
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}
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int CoEdTextVersion::
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knowsOfNewerChangesThan( const CoEdTextVersion &version ) const
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{
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SiteChange *curr1 = _head;
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SiteChange *curr2 = version._head;
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while ((curr1 != 0) && (curr2 != 0)) {
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int wait = 0;
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int diff = curr1->cmp( *curr2 );
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switch (diff) {
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case -2:
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// I know of a change from a site that he
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// has not even heard from.
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case 1:
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// I know of a change from this site that
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// is later than the one he knows.
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return 1;
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case -1:
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// He knows of a change from this site that
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// is later than the one I know. Big deal.
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break;
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case 2:
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// He knows of a change from a site that I
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// have not even heard from. So wait until
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// my next site comes up in his list.
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wait = 1;
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break;
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case 0:
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break;
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}
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if (! wait) {
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curr1 = (SiteChange *)curr1->_next;
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}
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curr2 = (SiteChange *)curr2->_next;
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}
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if ((curr1 != 0) && (curr2 == 0)) {
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//
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// I still have a change from a site that he has
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// never even heard from.
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//
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return 1;
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}
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return 0;
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}
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int CoEdTextVersion::
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knowsOf( const CoEdSiteID &site, int numChanges ) const
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{
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SiteChange *curr = _head;
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while (curr != 0) {
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if ( *(CoEdSiteID *)curr == site ) {
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return (curr->_changeNum >= numChanges);
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}
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curr = (SiteChange *)curr->_next;
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}
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return 0;
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}
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