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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Currently uses an unsorted array of numbers.
*
*/
#include <config.h>
#include <stdio.h>
#include <parc/algol/parc_Memory.h>
#include <ccnx/forwarder/metis/core/metis_NumberSet.h>
#include <parc/algol/parc_ArrayList.h>
#include <LongBow/runtime.h>
struct metis_number_set {
MetisNumber *arrayOfNumbers;
size_t length;
size_t limit;
unsigned refcount;
};
static void metisNumberSet_Expand(MetisNumberSet *set);
MetisNumberSet *
metisNumberSet_Create()
{
MetisNumberSet *set = parcMemory_AllocateAndClear(sizeof(MetisNumberSet));
assertNotNull(set, "parcMemory_AllocateAndClear(%zu) returned NULL", sizeof(MetisNumberSet));
set->arrayOfNumbers = parcMemory_AllocateAndClear(sizeof(MetisNumber) * 16);
assertNotNull((set->arrayOfNumbers), "parcMemory_AllocateAndClear(%zu) returned NULL", sizeof(MetisNumber) * 16);
set->length = 0;
set->limit = 16;
set->refcount = 1;
return set;
}
MetisNumberSet *
metisNumberSet_Acquire(const MetisNumberSet *original)
{
assertNotNull(original, "Parameter original must be non-null");
MetisNumberSet *copy = (MetisNumberSet *) original;
copy->refcount++;
return copy;
}
void
metisNumberSet_Release(MetisNumberSet **setPtr)
{
assertNotNull(setPtr, "Parameter must be non-null double pointer");
assertNotNull(*setPtr, "Parameter must dereference to non-null pointer");
MetisNumberSet *set = *setPtr;
assertTrue(set->refcount > 0, "Invalid state: calling destroy on an object with 0 reference count");
set->refcount--;
if (set->refcount == 0) {
parcMemory_Deallocate((void **) &(set->arrayOfNumbers));
parcMemory_Deallocate((void **) &set);
*setPtr = NULL;
}
}
/**
* @function metisNumberSet_AddNoChecks
* @abstract Add a number we know is not already in the set
* @discussion
* Used by other functions that already know the number is unique in the set,
* Does not do the expensive Contains check.
*
* @param <#param1#>
*/
static void
metisNumberSet_AddNoChecks(MetisNumberSet *set, MetisNumber number)
{
if (set->length == set->limit) {
metisNumberSet_Expand(set);
}
set->arrayOfNumbers[ set->length ] = number;
set->length++;
}
bool
metisNumberSet_Add(MetisNumberSet *set, MetisNumber number)
{
assertNotNull(set, "Parameter set must be non-null");
if (metisNumberSet_Contains(set, number)) {
return false;
}
metisNumberSet_AddNoChecks(set, number);
return true;
}
size_t
metisNumberSet_Length(const MetisNumberSet *set)
{
assertNotNull(set, "Parameter set must be non-null");
return set->length;
}
MetisNumber
metisNumberSet_GetItem(const MetisNumberSet *set, size_t ordinalIndex)
{
assertNotNull(set, "Parameter set must be non-null");
assertTrue(ordinalIndex < set->length, "Limit beyond end of set, length %zu got %zu", set->length, ordinalIndex);
return set->arrayOfNumbers[ordinalIndex];
}
bool
metisNumberSet_Contains(const MetisNumberSet *set, MetisNumber number)
{
assertNotNull(set, "Parameter set must be non-null");
for (size_t i = 0; i < set->length; i++) {
if (set->arrayOfNumbers[i] == number) {
return true;
}
}
return false;
}
void
metisNumberSet_AddSet(MetisNumberSet *destinationSet, const MetisNumberSet *setToAdd)
{
assertNotNull(destinationSet, "Parameter destinationSet must be non-null");
assertNotNull(setToAdd, "Parameter setToAdd must be non-null");
for (size_t i = 0; i < setToAdd->length; i++) {
metisNumberSet_Add(destinationSet, setToAdd->arrayOfNumbers[i]);
}
}
MetisNumberSet *
metisNumberSet_Subtract(const MetisNumberSet *minuend, const MetisNumberSet *subtrahend)
{
// because the underlying ADT is not sorted, this is pretty ineffient, could be O(n^2).
MetisNumberSet *difference = metisNumberSet_Create();
for (size_t i = 0; i < minuend->length; i++) {
bool unique = true;
for (size_t j = 0; j < subtrahend->length && unique; j++) {
if (minuend->arrayOfNumbers[i] == subtrahend->arrayOfNumbers[j]) {
unique = false;
}
}
if (unique) {
metisNumberSet_AddNoChecks(difference, minuend->arrayOfNumbers[i]);
}
}
return difference;
}
bool
metisNumberSet_Equals(const MetisNumberSet *a, const MetisNumberSet *b)
{
if (a == NULL && b == NULL) {
return true;
}
if (a == NULL || b == NULL) {
return false;
}
if (a->length == b->length) {
for (size_t i = 0; i < a->length; i++) {
bool found = false;
for (size_t j = 0; j < b->length && !found; j++) {
if (a->arrayOfNumbers[i] == b->arrayOfNumbers[j]) {
found = true;
}
}
if (!found) {
return false;
}
}
return true;
}
return false;
}
void
metisNumberSet_Remove(MetisNumberSet *set, MetisNumber number)
{
assertNotNull(set, "Parameter set must be non-null");
for (size_t i = 0; i < set->length; i++) {
if (set->arrayOfNumbers[i] == number) {
set->length--;
if (set->length > 0) {
// move the last element to the removed element to keep the array packed.
set->arrayOfNumbers[i] = set->arrayOfNumbers[set->length];
}
return;
}
}
}
// =====================================================
static void
metisNumberSet_Expand(MetisNumberSet *set)
{
size_t newlimit = set->limit * 2;
size_t newbytes = newlimit * sizeof(MetisNumber);
set->arrayOfNumbers = parcMemory_Reallocate(set->arrayOfNumbers, newbytes);
set->limit = newlimit;
}
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