Gigamap custom type indexers?

[hrstoyanov]

Gigamap provides built-in indexers for: UUID , Long , etc. But how do I implement a custom indexer for a type like TSID (compact replacement of UUID)?

[fh-ms]

The quick version would be this one. The Tsid consists of a single long and is probably of high cardinality, so a binary indexer would be the optimal solution.

final static BinaryIndexer<MyEntity> tsidIndex = new BinaryIndexer.Abstract<>()
{
	@Override
	public long indexBinary(final MyEntity entity)
	{
		return entity.getTsid().toLong();
	}
};

[fh-ms]

If you want a nice reusable, typed indexer for Tsids, this is the implementation:

public abstract class TsidIndexer<E> extends BinaryIndexer.Abstract<E>
{
	@Override
	public final long indexBinary(final E entity)
	{
		return this.getTsid(entity).toLong();
	}
	
	protected abstract Tsid getTsid(E entity);
	
	public <S extends E> Condition<S> is(final Tsid id)
	{
		return super.is(id.toLong());
	}
}

and this the usage

final static TsidIndexer<MyEntity> tsidIndex = new TsidIndexer<>()
{
	@Override
	protected Tsid getTsid(final MyEntity entity)
	{
		return entity.getTsid();
	}
};

[hrstoyanov]

@fh-ms what if I have a value of NULL? A binary indexer will not be able to handle this? If I map the NULL Tsid to 0L (long value), the indexer will throw an exception as it expects long values>0 ? My current workaround is to map it to Long.MAX_VALUE, but would prefer 0L.