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/* Implementation for Objective-C CircularArray collection object
Copyright (C) 1993 R. Andrew McCallum <mccallum@cs.rochester.edu>
Dept. of Computer Science, U. of Rochester, Rochester, NY 14627
This file is part of the GNU Objective-C Collection library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <coll/CircularArray.h>
#include <coll/CircularArrayPrivate.h>
@implementation CircularArray
+ initialize
{
if (self == [CircularArray class])
[self setVersion:-1]; /* alpha release */
return self;
}
/* This is the designated initializer of this class */
- initDescription: (const char *)type capacity: (unsigned)aCapacity
{
[super initDescription:type capacity:aCapacity];
_start_index = 0;
return self;
}
/* This is the only method that changes the value of the instance
variable _capacity, except for "-initDescription:capacity:" */
- setCapacity: (unsigned)newCapacity
{
elt *new_contents;
int i;
if (newCapacity > _count) {
/* This could be more efficient */
OBJC_MALLOC(new_contents, elt, newCapacity);
// new_contents = (elt *) malloc(newCapacity * sizeof(elt));
for (i = 0; i < _count; i++)
new_contents[i] = _contents_array[CIRCULAR_TO_BASIC(i)];
free(_contents_array);
_contents_array = new_contents;
_start_index = 0;
_capacity = newCapacity;
}
return self;
}
- (elt) removeElementAtIndex: (unsigned)index
{
unsigned basicIndex;
elt ret;
if (INDEX_RANGE_WARNING(index, _count))
return COLL_NO_ELEMENT;
basicIndex = CIRCULAR_TO_BASIC(index);
ret = _contents_array[basicIndex];
circularFillHoleAt(self, basicIndex);
decrementCount(self);
return ret;
}
- (elt) removeFirstElement
{
elt ret;
ret = _contents_array[_start_index];
_start_index = (_start_index + 1) % _capacity;
decrementCount(self);
return ret;
}
- (elt) removeLastElement
{
elt ret;
if (!_count)
return COLL_NO_ELEMENT;
ret = _contents_array[CIRCULAR_TO_BASIC(_count-1)];
decrementCount(self);
return ret;
}
- (elt) elementAtIndex: (unsigned)index
{
if (INDEX_RANGE_WARNING(index, _count))
return COLL_NO_ELEMENT;
return _contents_array[CIRCULAR_TO_BASIC(index)];
}
- appendElement: (elt)newElement
{
incrementCount(self);
_contents_array[CIRCULAR_TO_BASIC(_count-1)] = newElement;
return self;
}
- prependElement: (elt)newElement
{
incrementCount(self);
_start_index = (_capacity + _start_index - 1) % _capacity;
_contents_array[_start_index] = newElement;
return self;
}
- insertElement: (elt)newElement atIndex: (unsigned)index
{
unsigned basicIndex;
if (INDEX_RANGE_WARNING(basicIndex, _count+1))
return nil;
basicIndex = CIRCULAR_TO_BASIC(index);
incrementCount(self);
circularMakeHoleAt(self, basicIndex);
_contents_array[basicIndex] = newElement;
return [self notImplemented:_cmd];
}
- (elt) replaceElementAtIndex: (unsigned)index with: (elt)newElement
{
elt ret;
unsigned basicIndex = CIRCULAR_TO_BASIC(index);
if (INDEX_RANGE_WARNING(basicIndex, _count))
return nil;
ret = _contents_array[basicIndex];
_contents_array[basicIndex] = newElement;
return ret;
}
- swapAtIndeces: (unsigned)index1 : (unsigned)index2
{
elt tmp;
if (INDEX_RANGE_WARNING(index1, _count)
|| INDEX_RANGE_WARNING(index2, _count))
return nil;
index1 = CIRCULAR_TO_BASIC(index1);
index2 = CIRCULAR_TO_BASIC(index2);
tmp = _contents_array[index1];
_contents_array[index1] = _contents_array[index2];
_contents_array[index2] = tmp;
return self;
}
/* Let IndexedCollection take care of this?
- shallowCopyReplaceFrom: (unsigned)start to: (unsigned)stop
with: (id <Collecting>)replaceCollection
{
id newColl = [self emptyCopyAs:[self species]];
unsigned index;
return [self notImplemented:_cmd];
for (index = 0; index < start && index < _count; index++)
[newColl appendElement:_contents_array[index]];
[newColl appendContentsOf:replaceCollection];
for (index = stop+1; index < _count; index++)
[newColl appendElement:_contents_array[index]];
return newColl;
}
*/
/* just temporary for debugging */
- circularArrayPrintForDebugger
{
int i;
printf("_start_index=%d, _count=%d, _capacity=%d\n",
_start_index, _count, _capacity);
for (i = 0; i < _capacity; i++)
{
printf("%3d ", i);
}
printf("\n");
for (i = 0; i < _capacity; i++)
{
printf("%3d ", _contents_array[i].int_t);
}
printf("\n");
for (i = 0; i < _capacity; i++)
{
printf("%3d ", _contents_array[CIRCULAR_TO_BASIC(i)].int_t);
}
printf("\n");
return self;
}
@end
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