class BindMap {
public:
// This nested class represents a single mapping between a parameter name
// and its associated parameter index in a prepared statement.
class Pair { friend class BindMap;
public:
inline int GetIndex() {
return index;
}
inline v8::Local<v8::String> GetName(v8::Isolate* isolate) {
return name.Get(isolate);
}
private:
explicit Pair(v8::Isolate* isolate, const char* name, int index)
: name(isolate, InternalizedFromUtf8(isolate, name, -1)), index(index) {}
explicit Pair(v8::Isolate* isolate, Pair* pair)
: name(isolate, pair->name), index(pair->index) {}
const v8::Global<v8::String> name;
const int index;
};
explicit BindMap(char _) {
assert(_ == 0);
pairs = NULL;
capacity = 0;
length = 0;
}
~BindMap() {
while (length) pairs[--length].~Pair();
FREE_ARRAY<Pair>(pairs);
}
inline Pair* GetPairs() {
return pairs;
}
inline int GetSize() {
return length;
}
// Adds a pair to the bind map, expanding the capacity if necessary.
void Add(v8::Isolate* isolate, const char* name, int index) {
assert(name != NULL);
if (capacity == length) Grow(isolate);
new (pairs + length++) Pair(isolate, name, index);
}
private:
void Grow(v8::Isolate* isolate) {
assert(capacity == length);
capacity = (capacity << 1) | 2;
Pair* new_pairs = ALLOC_ARRAY<Pair>(capacity);
for (int i = 0; i < length; ++i) {
new (new_pairs + i) Pair(isolate, pairs + i);
pairs[i].~Pair();
}
FREE_ARRAY<Pair>(pairs);
pairs = new_pairs;
}
Pair* pairs;
int capacity;
int length;
};