public PersistentMap<K, V> include(Map<K, V> values) {
PersistentMap<K, V> pm = this;
for (Map.Entry<K, V> entry : values.entrySet()) {
pm = pm.include(entry.getKey(), entry.getValue());
}
return pm;
}
public PersistentMap<K, V> delete(Collection<K> keys) {
PersistentMap<K, V> pm = this;
for (K k : keys) {
pm = pm.delete(k);
}
return pm;
}
public boolean containsAll(PersistentMap<K, V> pm) {
for (Map.Entry<K, V> ent : pm.entrySet()) {
if (!containsEntry(ent)) return false;
}
return true;
}
public boolean equals(PersistentMap<K, V> pm) {
if (this == pm) return true;
if (this.size() != pm.size()) return false;
return this.containsAll(pm) && pm.containsAll(this);
}