package com.googlecode.objectify.impl.translate;
import com.googlecode.objectify.Key;
import com.googlecode.objectify.Ref;
import com.googlecode.objectify.annotation.Load;
import com.googlecode.objectify.impl.LoadConditions;
import com.googlecode.objectify.impl.Path;
/**
* Knows how to convert Ref<?> objects to datastore-native Key objects and vice-versa.
*
* @author Jeff Schnitzer <jeff@infohazard.org>
*/
public class RefTranslatorFactory extends ValueTranslatorFactory<Ref<?>, com.google.appengine.api.datastore.Key>
{
@SuppressWarnings({ "unchecked", "rawtypes" })
public RefTranslatorFactory() {
super((Class)Ref.class);
}
@Override
protected ValueTranslator<Ref<?>, com.google.appengine.api.datastore.Key> createValueTranslator(TypeKey<Ref<?>> tk, CreateContext ctx, Path path) {
final LoadConditions loadConditions = new LoadConditions(tk.getAnnotation(Load.class));
return new ValueTranslator<Ref<?>, com.google.appengine.api.datastore.Key>(com.google.appengine.api.datastore.Key.class) {
@Override
protected Ref<?> loadValue(com.google.appengine.api.datastore.Key value, LoadContext ctx, Path path) throws SkipException {
return ctx.loadRef(Key.create(value), loadConditions);
}
@Override
protected com.google.appengine.api.datastore.Key saveValue(Ref<?> value, boolean index, SaveContext ctx, Path path) throws SkipException {
return ctx.saveRef(value, loadConditions);
}
};
}
}