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The simplest convenient interface to the Google App Engine datastore

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package com.googlecode.objectify.util.jackson;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.JsonToken;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.googlecode.objectify.Key;
import com.googlecode.objectify.Ref;

import java.io.IOException;

/**
 * Will deserialize an Objectify Ref that was serialized with the RefSerializer.  Note that it doesn't
 * currently work for full objects (ie, serialized when the ref was loaded), only for string keys (ie,
 * serialized when the ref was not loaded).
 */
@SuppressWarnings("rawtypes")
public class RefDeserializer extends StdDeserializer {
	private static final long serialVersionUID = 1L;

	/** */
	public RefDeserializer() {
		super(Ref.class);
	}

	/**
	 */
	@Override
	public Ref deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
		if (jp.getCurrentToken() != JsonToken.VALUE_STRING)
			throw new IllegalStateException("Cannot yet deserialize Refs that were serialized to a full entity object (as opposed to just string key representation)");

		String text = jp.getText();
		return Ref.create(Key.create(text));
	}
}