# If there is no array associated, then create it.
fun add_one(k: K, v: V)
do
- if self.has_key(k) then
- self[k].add(v)
+ var x = self.get_or_null(k)
+ if x != null then
+ x.add(v)
else
self[k] = [v]
end
fun [](k1: K1, k2: K2): nullable V
do
var level1 = self.level1
- if not level1.has_key(k1) then return null
- var level2 = level1[k1]
- if not level2.has_key(k2) then return null
- return level2[k2]
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then return null
+ return level2.get_or_null(k2)
end
# Set `v` the value associated to the keys `k1` and `k2`.
fun []=(k1: K1, k2: K2, v: V)
do
var level1 = self.level1
- var level2: HashMap[K2, V]
- if not level1.has_key(k1) then
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then
level2 = new HashMap[K2, V]
level1[k1] = level2
- else
- level2 = level1[k1]
end
level2[k2] = v
end
fun remove_at(k1: K1, k2: K2)
do
var level1 = self.level1
-
- if not level1.has_key(k1) then return
-
- var level2 = level1[k1]
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then return
level2.keys.remove(k2)
end
+
+ # Remove all items
+ fun clear do level1.clear
end
# Simple way to store an `HashMap[K1, HashMap[K2, HashMap[K3, V]]]`
fun [](k1: K1, k2: K2, k3: K3): nullable V
do
var level1 = self.level1
- if not level1.has_key(k1) then return null
- var level2 = level1[k1]
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then return null
return level2[k2, k3]
end
fun []=(k1: K1, k2: K2, k3: K3, v: V)
do
var level1 = self.level1
- var level2: HashMap2[K2, K3, V]
- if not level1.has_key(k1) then
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then
level2 = new HashMap2[K2, K3, V]
level1[k1] = level2
- else
- level2 = level1[k1]
end
level2[k2, k3] = v
end
fun remove_at(k1: K1, k2: K2, k3: K3)
do
var level1 = self.level1
-
- if not level1.has_key(k1) then return
-
- var level2 = level1[k1]
+ var level2 = level1.get_or_null(k1)
+ if level2 == null then return
level2.remove_at(k2, k3)
end
+
+ # Remove all items
+ fun clear do level1.clear
end
# A map with a default value.