Exemplo n.º 1
0
/**
 * Creates an index, and buckets and sorts the list of records into the index.
 */
void AlphabeticIndex::initBuckets(UErrorCode &errorCode) {
    if (U_FAILURE(errorCode) || buckets_ != NULL) {
        return;
    }
    buckets_ = createBucketList(errorCode);
    if (U_FAILURE(errorCode) || inputList_ == NULL || inputList_->isEmpty()) {
        return;
    }

    // Sort the records by name.
    // Stable sort preserves input order of collation duplicates.
    inputList_->sortWithUComparator(recordCompareFn, collator_, errorCode);

    // Now, we traverse all of the input, which is now sorted.
    // If the item doesn't go in the current bucket, we find the next bucket that contains it.
    // This makes the process order n*log(n), since we just sort the list and then do a linear process.
    // However, if the user adds an item at a time and then gets the buckets, this isn't efficient, so
    // we need to improve it for that case.

    Bucket *currentBucket = getBucket(*buckets_->bucketList_, 0);
    int32_t bucketIndex = 1;
    Bucket *nextBucket;
    const UnicodeString *upperBoundary;
    if (bucketIndex < buckets_->bucketList_->size()) {
        nextBucket = getBucket(*buckets_->bucketList_, bucketIndex++);
        upperBoundary = &nextBucket->lowerBoundary_;
    } else {
        nextBucket = NULL;
        upperBoundary = NULL;
    }
    for (int32_t i = 0; i < inputList_->size(); ++i) {
        Record *r = getRecord(*inputList_, i);
        // if the current bucket isn't the right one, find the one that is
        // We have a special flag for the last bucket so that we don't look any further
        while (upperBoundary != NULL &&
                collatorPrimaryOnly_->compare(r->name_, *upperBoundary, errorCode) >= 0) {
            currentBucket = nextBucket;
            // now reset the boundary that we compare against
            if (bucketIndex < buckets_->bucketList_->size()) {
                nextBucket = getBucket(*buckets_->bucketList_, bucketIndex++);
                upperBoundary = &nextBucket->lowerBoundary_;
            } else {
                upperBoundary = NULL;
            }
        }
        // now put the record into the bucket.
        Bucket *bucket = currentBucket;
        if (bucket->displayBucket_ != NULL) {
            bucket = bucket->displayBucket_;
        }
        if (bucket->records_ == NULL) {
            bucket->records_ = new UVector(errorCode);
            if (bucket->records_ == NULL) {
                errorCode = U_MEMORY_ALLOCATION_ERROR;
                return;
            }
        }
        bucket->records_->addElement(r, errorCode);
    }
}
Exemplo n.º 2
0
Arquivo: hash.c Projeto: shwetado/DSA
HashMap createHash(hashCodeGenerator gethash, keyComparator compare){
	HashMap hash;
	int index;
	hash.bucket = createArrList(10);
	hash.getHash = gethash;
	hash.compare = compare;
	for(index = 0; index < 10; index++)
		hash.bucket.base[index] = createBucketList();
	return hash;
};
Exemplo n.º 3
0
AlphabeticIndex::ImmutableIndex *AlphabeticIndex::buildImmutableIndex(UErrorCode &errorCode) {
    if (U_FAILURE(errorCode)) { return NULL; }
    // In C++, the ImmutableIndex must own its copy of the BucketList,
    // even if it contains no records, for proper memory management.
    // We could clone the buckets_ if they are not NULL,
    // but that would be worth it only if this method is called multiple times,
    // or called after using the old-style bucket iterator API.
    LocalPointer<BucketList> immutableBucketList(createBucketList(errorCode));
    LocalPointer<RuleBasedCollator> coll(
        static_cast<RuleBasedCollator *>(collatorPrimaryOnly_->clone()));
    if (immutableBucketList.isNull() || coll.isNull()) {
        errorCode = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }
    ImmutableIndex *immIndex = new ImmutableIndex(immutableBucketList.getAlias(), coll.getAlias());
    if (immIndex == NULL) {
        errorCode = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
    }
    // The ImmutableIndex adopted its parameter objects.
    immutableBucketList.orphan();
    coll.orphan();
    return immIndex;
}