Keys

Keys are a unique identifier for accessing meta from a ValueHolder.

int time = holder.get(Keys.TIME).get();

The above above example shows an example of using ValueHolders, something of which is covered elsewhere.

Storing keys

Most applications that use Meta API will choose to create a final class to contain all the Keys.

import uk.jamierocks.meta.api.MetaQuery;
import uk.jamierocks.meta.api.key.Key;
import uk.jamierocks.meta.api.key.KeyHelper;
import uk.jamierocks.meta.api.value.Value;

public final class Keys {

    public final Key<Value<Integer>> TIME = KeyHelper.newSingleKey(Value.class, MetaQuery.of("Time"));
}

Keys are unique and therefor you should only ever pass around ONE instance of it, hence the reason Keys is useful.