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197
Old/CircularArray.m
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197
Old/CircularArray.m
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/* Implementation for Objective-C CircularArray collection object
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Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
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Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
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Created: May 1993
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
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*/
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#include <config.h>
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#include <base/CircularArray.h>
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#include <base/CircularArrayPrivate.h>
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@implementation CircularArray
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/* This is the designated initializer of this class */
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- initWithCapacity: (unsigned)aCapacity
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{
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[super initWithCapacity:aCapacity];
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_start_index = 0;
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return self;
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}
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/* Archiving must mimic the above designated initializer */
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- _initCollectionWithCoder: coder
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{
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[super _initCollectionWithCoder:coder];
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_start_index = 0;
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return self;
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}
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/* Empty copy must empty an allocCopy'ed version of self */
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- emptyCopy
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{
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CircularArray *copy = [super emptyCopy];
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copy->_start_index = 0;
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return copy;
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}
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- (void) empty
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{
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[super empty];
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_start_index = 0;
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}
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/* This is the only method that changes the value of the instance
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variable _capacity, except for "-initWithCapacity:" */
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- (void) setCapacity: (unsigned)newCapacity
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{
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id *new_contents;
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int i;
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if (newCapacity > _count) {
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/* This could be more efficient */
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OBJC_MALLOC(new_contents, id, newCapacity);
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for (i = 0; i < _count; i++)
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new_contents[i] = _contents_array[CIRCULAR_TO_BASIC(i)];
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OBJC_FREE(_contents_array);
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_contents_array = new_contents;
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_start_index = 0;
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_capacity = newCapacity;
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}
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}
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- (void) removeObjectAtIndex: (unsigned)index
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{
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unsigned basicIndex;
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CHECK_INDEX_RANGE_ERROR(index, _count);
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basicIndex = CIRCULAR_TO_BASIC(index);
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[_contents_array[basicIndex] release];
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circularFillHoleAt(self, basicIndex);
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decrementCount(self);
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}
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- (void) removeFirstObject
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{
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if (!_count)
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return;
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[_contents_array[_start_index] release];
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_start_index = (_start_index + 1) % _capacity;
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decrementCount(self);
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}
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- (void) removeLastObject
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{
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if (!_count)
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return;
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[_contents_array[CIRCULAR_TO_BASIC(_count-1)] release];
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decrementCount(self);
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}
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- objectAtIndex: (unsigned)index
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{
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CHECK_INDEX_RANGE_ERROR(index, _count);
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return _contents_array[CIRCULAR_TO_BASIC(index)];
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}
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- (void) appendObject: newObject
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{
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incrementCount(self);
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[newObject retain];
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_contents_array[CIRCULAR_TO_BASIC(_count-1)] = newObject;
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}
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- (void) prependElement: newObject
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{
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incrementCount(self);
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[newObject retain];
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_start_index = (_capacity + _start_index - 1) % _capacity;
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_contents_array[_start_index] = newObject;
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}
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- (void) insertElement: newObject atIndex: (unsigned)index
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{
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unsigned basicIndex;
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CHECK_INDEX_RANGE_ERROR(index, _count+1);
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incrementCount(self);
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[newObject retain];
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basicIndex = CIRCULAR_TO_BASIC(index);
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circularMakeHoleAt(self, basicIndex);
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_contents_array[basicIndex] = newObject;
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}
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- (void) replaceObjectAtIndex: (unsigned)index withObject: newObject
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{
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unsigned basicIndex;
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CHECK_INDEX_RANGE_ERROR(index, _count);
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[newObject retain];
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basicIndex = CIRCULAR_TO_BASIC(index);
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[_contents_array[basicIndex] release];
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_contents_array[basicIndex] = newObject;
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}
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- (void) swapAtIndeces: (unsigned)index1 : (unsigned)index2
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{
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id tmp;
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CHECK_INDEX_RANGE_ERROR(index1, _count);
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CHECK_INDEX_RANGE_ERROR(index2, _count);
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index1 = CIRCULAR_TO_BASIC(index1);
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index2 = CIRCULAR_TO_BASIC(index2);
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tmp = _contents_array[index1];
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_contents_array[index1] = _contents_array[index2];
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_contents_array[index2] = tmp;
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}
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#if 0
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/* just temporary for debugging */
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- circularArrayPrintForDebugger
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{
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int i;
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printf("_start_index=%d, _count=%d, _capacity=%d\n",
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_start_index, _count, _capacity);
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for (i = 0; i < _capacity; i++)
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{
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printf("%3d ", i);
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}
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printf("\n");
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for (i = 0; i < _capacity; i++)
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{
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printf("%3d ", _contents_array[i].int_t);
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}
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printf("\n");
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for (i = 0; i < _capacity; i++)
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{
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printf("%3d ", _contents_array[CIRCULAR_TO_BASIC(i)].int_t);
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}
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printf("\n");
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return self;
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}
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#endif
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@end
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