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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package javax.jdo.annotations;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.jdo.AttributeConverter;

/**
 * Specifies that a given type should be converted before being stored to, and after being retrieved from
 * the datastore using the given {@link AttributeConverter}.
 *
 * If this annotation is placed on a type, then the conversion applies to all fields or properties whose types
 * match the entity type of the given {@link AttributeConverter}.
 * Any {@link Convert} annotations placed on members overrides any type-level conversion specifications.
 * 
 * If this annotation is placed on a field or property, the annotated attribute's type must be 
 * assignment-compatible with the {@link AttributeConverter}'s entity type argument.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE, ElementType.METHOD, ElementType.FIELD })
public @interface Convert {

	/**
	 * The {@link AttributeConverter} to use for conversion.
	 * @return Converter class to use
	 */
	@SuppressWarnings("rawtypes")
	Class value();

	/**
	 * Whether this conversion is enabled. True by default.
	 * Setting this to false allows disabling conversion that was specified at PMF level.
	 * @return Whether the PMF default converter is enabled
	 */
	boolean enabled() default true;
}