com.googlecode.objectify.impl.translate.RefTranslatorFactory Maven / Gradle / Ivy

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The simplest convenient interface to the Google App Engine datastore

There is a newer version: 6.1.2

package com.googlecode.objectify.impl.translate;

import com.google.cloud.datastore.KeyValue;
import com.google.cloud.datastore.Value;
import com.google.cloud.datastore.ValueType;
import com.googlecode.objectify.Key;
import com.googlecode.objectify.Ref;
import com.googlecode.objectify.annotation.Load;
import com.googlecode.objectify.annotation.Parent;
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 
 */
public class RefTranslatorFactory extends ValueTranslatorFactory, com.google.cloud.datastore.Key>
{
	@SuppressWarnings({ "unchecked", "rawtypes" })
	public RefTranslatorFactory() {
		super((Class)Ref.class);
	}

	@Override
	protected ValueTranslator, com.google.cloud.datastore.Key> createValueTranslator(final TypeKey> tk, final CreateContext ctx, final Path path) {

		final LoadConditions loadConditions = new LoadConditions(tk.getAnnotation(Load.class), tk.getAnnotation(Parent.class));

		return new ValueTranslator, com.google.cloud.datastore.Key>(ValueType.KEY) {

			@Override
			protected Ref loadValue(final Value value, final LoadContext ctx, final Path path) throws SkipException {
				return ctx.loadRef(Key.create(value.get()), loadConditions);
			}

			@Override
			protected Value saveValue(final Ref value, final SaveContext ctx, final Path path) throws SkipException {
				return KeyValue.of(ctx.saveRef(value, loadConditions));
			}
		};
	}
}