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using Gee;
public class WeakMap<K, V> : Gee.AbstractMap<K, V> {
private HashMap<K, weak V> hash_map;
private HashMap<K, WeakNotifyWrapper> notify_map;
public HashDataFunc<K>? key_hash_func = null;
public EqualDataFunc<K>? key_equal_func = null;
public EqualDataFunc<V>? value_equal_func = null;
public WeakMap(owned HashDataFunc<K>? key_hash_func = null, owned EqualDataFunc<K>? key_equal_func = null, owned EqualDataFunc<V>? value_equal_func = null) {
if (!typeof(V).is_object()) {
error("WeakMap only takes values that are Objects");
}
this.key_hash_func = (owned)key_hash_func;
this.key_equal_func = (owned)key_equal_func;
this.value_equal_func = (owned)value_equal_func;
if (this.key_equal_func == null || this.key_equal_func == null || this.value_equal_func == null) {
hash_map = new HashMap<K, weak V>();
notify_map = new HashMap<K, WeakNotifyWrapper>();
} else {
hash_map = new HashMap<K, weak V>((v) => { return this.key_hash_func != null ? this.key_hash_func(v) : 0; },
(a, b) => { return this.key_equal_func != null ? this.key_equal_func(a, b) : a == b; },
(a, b) => { return this.value_equal_func != null ? this.value_equal_func(a, b) : a == b; });
notify_map = new HashMap<K, WeakNotifyWrapper>((v) => { return this.key_hash_func != null ? this.key_hash_func(v) : 0; },
(a, b) => { return this.key_equal_func != null ? this.key_equal_func(a, b) : a == b; });
}
}
public override void clear() {
foreach (K key in notify_map.keys) {
Object o = (Object) hash_map[key];
o.weak_unref(notify_map[key].func);
}
hash_map.clear();
notify_map.clear();
}
public override V @get(K key) {
if (!hash_map.has_key(key)) return null;
var v = hash_map[key];
return (owned) v;
}
public override bool has(K key, V value) {
return has_key(key) && (this.value_equal_func != null ? this.value_equal_func(hash_map[key], value) : hash_map[key] == value);
}
public override bool has_key(K key) {
return hash_map.has_key(key);
}
public override Gee.MapIterator<K,V> map_iterator() {
assert_not_reached();
}
public override void @set(K key, V value) {
assert(value != null);
unset(key);
Object v_obj = (Object) value;
var notify_wrap = new WeakNotifyWrapper((obj) => {
hash_map.unset(key);
notify_map.unset(key);
});
notify_map[key] = notify_wrap;
v_obj.weak_ref(notify_wrap.func);
hash_map[key] = value;
}
public override bool unset(K key, out V value = null) {
if (!hash_map.has_key(key)) {
value = null;
return false;
}
Object v_obj = (Object) hash_map[key];
v_obj.weak_unref(notify_map[key].func);
notify_map.unset(key);
return hash_map.unset(key, out value);
}
public override Gee.Set<Gee.Map.Entry<K,V>> entries { owned get; }
public override Gee.Set<K> keys {
owned get { return hash_map.keys; }
}
public override bool read_only { get { assert_not_reached(); } }
public override int size { get { return hash_map.size; } }
public override Gee.Collection<V> values {
owned get {
assert_not_reached();
}
}
public override void dispose() {
foreach (K key in notify_map.keys) {
Object o = (Object) hash_map[key];
o.weak_unref(notify_map[key].func);
}
}
}
internal class WeakNotifyWrapper {
public WeakNotify func;
public WeakNotifyWrapper(owned WeakNotify func) {
this.func = (owned) func;
}
}
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