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• 0.6.2
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• Key.java

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org.eiichiro.acidhouse.Key Maven / Gradle / Ivy

/*
 * Copyright (C) 2011 Eiichiro Uchiumi. All Rights Reserved.
 * 
 * Licensed 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 org.eiichiro.acidhouse;

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

/**
 * {@code @Key} is a marker annotation to tell Acid House that the annotated 
 * field is used as the key to get the corresponding entity instance from 
 * the datastore. An entity class must have one {@code Key} annotated field.
 * 
 * @author Eiichiro Uchiumi
 */
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Target(ElementType.FIELD)
public @interface Key {}