com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAttribute Maven / Gradle / Ivy
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/*
* Copyright 2011-2019 Amazon.com, Inc. or its affiliates. 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://aws.amazon.com/apache2.0
*
* This file 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 com.amazonaws.services.dynamodbv2.datamodeling;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Interface for marking a class property as an attribute in a DynamoDB table.
* Applied to the getter method or the class field for a modeled property. If
* the annotation is applied directly to the class field, the corresponding
* getter and setter must be declared in the same class.
*
* This annotation is optional when the name of the DynamoDB attribute matches
* the name of the property declared in the class. When they differ, use this
* annotation with the attributeName() parameter to specify which DynamoDB
* attribute this property corresponds to. Furthermore, the
* {@link DynamoDBMapper} class assumes Java naming conventions, and will
* lower-case the first character of a getter method's property name to
* determine the name of the property. E.g., a method getValue() will map to the
* DynamoDB attribute "value". Similarly, a method isValid() maps to the
* DynamoDB attribute "valid".
*
* Getter methods not marked with this annotation are assumed to be modeled
* properties, unless marked with {@link DynamoDBIgnore}.
*/
@DynamoDB
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.METHOD})
public @interface DynamoDBAttribute {
/**
* Optional parameter when the name of the attribute as stored in DynamoDB
* should differ from the name used by the getter / setter.
*/
String attributeName() default "";
/**
* Optional parameter when using {@link DynamoDBFlattened}; identifies
* the field/property name on the target class to map as the attribute.
* @see com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBFlattened
*/
String mappedBy() default "";
}