EnumStringifier.java

package com.googlecode.objectify.stringifier;


import com.googlecode.objectify.ObjectifyFactory;
import com.googlecode.objectify.repackaged.gentyref.GenericTypeReflector;

import java.lang.reflect.Type;

/**
 * <p>Converts Enums back and forth with their string representation
 * 
 * @author Jeff Schnitzer <jeff@infohazard.org>
 */
public class EnumStringifier<E extends Enum> implements Stringifier<E>, InitializeStringifier
{
	private Class<E> enumClass;

	@Override
	public void init(ObjectifyFactory fact, Type keyType) {
		enumClass = (Class<E>)GenericTypeReflector.erase(keyType);
		assert Enum.class.isAssignableFrom(enumClass);
	}

	@Override
	public String toString(E obj) {
		return obj.name();
	}

	@Override
	public E fromString(String str) {
		return (E)Enum.valueOf(enumClass, str);
	}
}