public long get(long key) throws NoValueException {
        int index = indexer.get(key);
        if (index < 0) {
            throw NoValueException.noValueException;
        }
        return values[index];
    }
Returns the value for the given key.
@param key the key whose associated value is to be returned.
@exception NoValueException thrown if there is no value for the given key.
Ghidra/Framework/Generic/src/main/java/ghidra/util/datastruct/LongLongHashtable.java