bool PredictiveCursor::ascending_next(Key *key) {
while (!buf_.empty()) {
const bool is_root = (buf_.back() & IS_ROOT_FLAG) == IS_ROOT_FLAG;
const UInt32 node_id = buf_.back() & ~IS_ROOT_FLAG;
buf_.pop_back();
const Node node = trie_->ith_node(node_id);
if (!is_root && (node.sibling() != INVALID_LABEL)) {
GRN_DAT_THROW_IF(MEMORY_ERROR,
!buf_.push_back(node_id ^ node.label() ^ node.sibling()));
}
if (node.is_terminal()) {
Key temp_key;
trie_->ith_key(node.key_id(), &temp_key);
if (temp_key.length() >= min_length_) {
if (cur_++ >= offset_) {
*key = temp_key;
return true;
}
}
} else if (node.child() != INVALID_LABEL) {
GRN_DAT_THROW_IF(MEMORY_ERROR,
!buf_.push_back(node.offset() ^ node.child()));
}
}
return false;
}
void reserve(UInt32 new_capacity) {
if (new_capacity <= capacity()) {
return;
} else if ((new_capacity / 2) < capacity()) {
if (capacity() < (MAX_UINT32 / 2)) {
new_capacity = capacity() * 2;
} else {
new_capacity = MAX_UINT32;
}
}
T *new_buf = reinterpret_cast<T *>(
new (std::nothrow) char[sizeof(new_capacity) * new_capacity]);
GRN_DAT_THROW_IF(MEMORY_ERROR, new_buf == NULL);
for (UInt32 i = 0; i < size(); ++i) {
new (&new_buf[i]) T(buf_[i]);
}
for (UInt32 i = 0; i < size(); ++i) {
buf_[i].~T();
}
T *old_buf = buf_;
buf_ = new_buf;
delete [] reinterpret_cast<char *>(old_buf);
capacity_ = new_capacity;
}
bool PredictiveCursor::descending_next(Key *key) {
while (!buf_.empty()) {
const bool post_order = (buf_.back() & POST_ORDER_FLAG) == POST_ORDER_FLAG;
const UInt32 node_id = buf_.back() & ~POST_ORDER_FLAG;
const Base base = trie_->ith_node(node_id).base();
if (post_order) {
buf_.pop_back();
if (base.is_terminal()) {
Key temp_key;
trie_->ith_key(base.key_id(), &temp_key);
if (temp_key.length() >= min_length_) {
if (cur_++ >= offset_) {
*key = temp_key;
return true;
}
}
}
} else {
buf_.back() |= POST_ORDER_FLAG;
UInt16 label = trie_->ith_node(node_id).child();
while (label != INVALID_LABEL) {
GRN_DAT_THROW_IF(MEMORY_ERROR, !buf_.push_back(base.offset() ^ label));
label = trie_->ith_node(base.offset() ^ label).sibling();
}
}
}
return false;
}
void KeyCursor::open(const Trie &trie,
const String &min_str,
const String &max_str,
UInt32 offset,
UInt32 limit,
UInt32 flags) {
GRN_DAT_THROW_IF(PARAM_ERROR,
(min_str.ptr() == NULL) && (min_str.length() != 0));
GRN_DAT_THROW_IF(PARAM_ERROR,
(max_str.ptr() == NULL) && (max_str.length() != 0));
flags = fix_flags(flags);
KeyCursor new_cursor(trie, offset, limit, flags);
new_cursor.init(min_str, max_str);
new_cursor.swap(this);
}
UInt32 PredictiveCursor::fix_flags(UInt32 flags) const {
const UInt32 cursor_type = flags & CURSOR_TYPE_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR, (cursor_type != 0) &&
(cursor_type != PREDICTIVE_CURSOR));
flags |= PREDICTIVE_CURSOR;
const UInt32 cursor_order = flags & CURSOR_ORDER_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR, (cursor_order != 0) &&
(cursor_order != ASCENDING_CURSOR) &&
(cursor_order != DESCENDING_CURSOR));
if (cursor_order == 0) {
flags |= ASCENDING_CURSOR;
}
const UInt32 cursor_options = flags & CURSOR_OPTIONS_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR, cursor_options & ~(EXCEPT_EXACT_MATCH));
return flags;
}
UInt32 IdCursor::fix_flags(UInt32 flags) const {
const UInt32 cursor_type = flags & CURSOR_TYPE_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR, (cursor_type != 0) &&
(cursor_type != ID_RANGE_CURSOR));
flags |= ID_RANGE_CURSOR;
const UInt32 cursor_order = flags & CURSOR_ORDER_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR, (cursor_order != 0) &&
(cursor_order != ASCENDING_CURSOR) &&
(cursor_order != DESCENDING_CURSOR));
if (cursor_order == 0) {
flags |= ASCENDING_CURSOR;
}
const UInt32 cursor_options = flags & CURSOR_OPTIONS_MASK;
GRN_DAT_THROW_IF(PARAM_ERROR,
cursor_options & ~(EXCEPT_LOWER_BOUND | EXCEPT_UPPER_BOUND));
return flags;
}
void PredictiveCursor::open(const Trie &trie,
const String &str,
UInt32 offset,
UInt32 limit,
UInt32 flags) {
GRN_DAT_THROW_IF(PARAM_ERROR, (str.ptr() == NULL) && (str.length() != 0));
flags = fix_flags(flags);
PredictiveCursor new_cursor(trie, offset, limit, flags);
new_cursor.init(str);
new_cursor.swap(this);
}
void PredictiveCursor::init(const String &str) {
if (limit_ == 0) {
return;
}
min_length_ = str.length();
if ((flags_ & EXCEPT_EXACT_MATCH) == EXCEPT_EXACT_MATCH) {
++min_length_;
}
end_ = (offset_ > (UINT32_MAX - limit_)) ? UINT32_MAX : (offset_ + limit_);
UInt32 node_id = ROOT_NODE_ID;
for (UInt32 i = 0; i < str.length(); ++i) {
const Base base = trie_->ith_node(node_id).base();
if (base.is_terminal()) {
if (offset_ == 0) {
Key key;
trie_->ith_key(base.key_id(), &key);
if ((key.length() >= str.length()) &&
(key.str().substr(0, str.length()).compare(str, i) == 0)) {
if ((flags_ & ASCENDING_CURSOR) == ASCENDING_CURSOR) {
node_id |= IS_ROOT_FLAG;
}
GRN_DAT_THROW_IF(MEMORY_ERROR, !buf_.push_back(node_id));
}
}
return;
}
node_id = base.offset() ^ str[i];
if (trie_->ith_node(node_id).label() != str[i]) {
return;
}
}
if ((flags_ & ASCENDING_CURSOR) == ASCENDING_CURSOR) {
node_id |= IS_ROOT_FLAG;
}
GRN_DAT_THROW_IF(MEMORY_ERROR, !buf_.push_back(node_id));
}
void IdCursor::open(const Trie &trie,
const String &min_str,
const String &max_str,
UInt32 offset,
UInt32 limit,
UInt32 flags) {
UInt32 min_id = INVALID_KEY_ID;
if (min_str.ptr() != NULL) {
UInt32 key_pos;
GRN_DAT_THROW_IF(PARAM_ERROR,
!trie.search(min_str.ptr(), min_str.length(), &key_pos));
min_id = trie.get_key(key_pos).id();
}
UInt32 max_id = INVALID_KEY_ID;
if (max_str.ptr() != NULL) {
UInt32 key_pos;
GRN_DAT_THROW_IF(PARAM_ERROR,
!trie.search(max_str.ptr(), max_str.length(), &key_pos));
max_id = trie.get_key(key_pos).id();
}
open(trie, min_id, max_id, offset, limit, flags);
}
Cursor *CursorFactory::open(const Trie &trie,
const void *min_ptr, UInt32 min_length,
const void *max_ptr, UInt32 max_length,
UInt32 offset,
UInt32 limit,
UInt32 flags) {
GRN_DAT_THROW_IF(PARAM_ERROR, &trie == NULL);
const UInt32 cursor_type = flags & CURSOR_TYPE_MASK;
switch (cursor_type) {
case ID_RANGE_CURSOR: {
IdCursor *cursor = new (std::nothrow) IdCursor;
GRN_DAT_THROW_IF(MEMORY_ERROR, cursor == NULL);
try {
cursor->open(trie, String(min_ptr, min_length),
String(max_ptr, max_length), offset, limit, flags);
} catch (...) {
delete cursor;
throw;
}
return cursor;
}
case KEY_RANGE_CURSOR: {
KeyCursor *cursor = new (std::nothrow) KeyCursor;
GRN_DAT_THROW_IF(MEMORY_ERROR, cursor == NULL);
try {
cursor->open(trie, String(min_ptr, min_length),
String(max_ptr, max_length), offset, limit, flags);
} catch (...) {
delete cursor;
throw;
}
return cursor;
}
case PREFIX_CURSOR: {
PrefixCursor *cursor = new (std::nothrow) PrefixCursor;
GRN_DAT_THROW_IF(MEMORY_ERROR, cursor == NULL);
try {
cursor->open(trie, String(max_ptr, max_length), min_length,
offset, limit, flags);
} catch (...) {
delete cursor;
throw;
}
return cursor;
}
case PREDICTIVE_CURSOR: {
PredictiveCursor *cursor = new (std::nothrow) PredictiveCursor;
GRN_DAT_THROW_IF(MEMORY_ERROR, cursor == NULL);
try {
cursor->open(trie, String(min_ptr, min_length),
offset, limit, flags);
} catch (...) {
delete cursor;
throw;
}
return cursor;
}
default: {
GRN_DAT_THROW(PARAM_ERROR, "unknown cursor type");
}
}
}
