/**
* Construct a new vector from the contents of a map. The key domain is the key set of the map.
* Therefore, no new keys can be added to this vector.
*
* @param keyValueMap A map providing the values for the vector.
*/
SparseVector(Long2DoubleMap keyValueMap) {
keys = LongKeyDomain.fromCollection(keyValueMap.keySet(), true);
final int len = keys.domainSize();
values = new double[len];
for (int i = 0; i < len; i++) {
values[i] = keyValueMap.get(keys.getKey(i));
}
}
/**
* Check whether an entry is set.
*
* @param entry The entry.
* @return {@code true} if the entry is set in this vector.
* @throws IllegalArgumentException if the entry is not from this vector or another vector sharing
* the same key domain. Only vectors and their side channels share key domains for the
* purposes of this check.
*/
public boolean isSet(VectorEntry entry) {
final SparseVector evec = entry.getVector();
final int eind = entry.getIndex();
if (evec == null) {
throw new IllegalArgumentException("entry is not associated with a vector");
} else if (!keys.isCompatibleWith(evec.keys)) {
throw new IllegalArgumentException("entry does not have safe key domain");
}
assert entry.getKey() == keys.getKey(eind);
return keys.indexIsActive(eind);
}
/**
* Get the value for the entry's key.
*
* @param entry A {@code VectorEntry} with the key to look up
* @return the key's value
* @throws IllegalArgumentException if the entry is unset, or if it is not from this vector or
* another vector sharing the same key domain. Only vectors and their side channels share key
* domains for the purposes of this check.
*/
public double get(VectorEntry entry) {
final SparseVector evec = entry.getVector();
final int eind = entry.getIndex();
if (evec == null) {
throw new IllegalArgumentException("entry is not associated with a vector");
} else if (!evec.keys.isCompatibleWith(keys)) {
throw new IllegalArgumentException("entry does not have safe key domain");
}
assert entry.getKey() == keys.getKey(eind);
if (keys.indexIsActive(eind)) {
return values[eind];
} else {
throw new IllegalArgumentException("Key " + entry.getKey() + " is not set");
}
}
