org.helenus.jackson.annotation.JsonPropertyDefaultValuesProvider Maven / Gradle / Ivy
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/*
* Copyright (C) 2015-2015 The Helenus Driver Project Authors.
*
* 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.helenus.jackson.annotation;
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;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.stream.Stream;
import com.fasterxml.jackson.annotation.JacksonAnnotation;
/**
* The JsonPropertyDefaultValuesProvider annotation is used to annotated
* a static method in a class which is able to provide the set of valid default values
* for a Json property annotated with {@link JsonPropertyDefaultValues} and defining
* a class using the {@link JsonPropertyDefaultValues#valueFromClass}.
*
* The referenced method must be public and static. It can return an array, a
* {@link Collection}, an {@link Iterable}, an {@link Iterator}, an
* {@link Enumeration}, or a {@link Stream} of objects or a single object.
* The string representation of each returned object will be used as a possible
* default value for the Json property.
*
* If the method is used to in association with an enum class, it is possible to
* have it accept one argument of type array of that enum and annotate the property
* that references this enum class with a {@link JsonPropertyEnumValues} annotation
* that uses the {@link JsonPropertyEnumValues#valueAvailablesOf} or
* {@link JsonPropertyEnumValues#keyAvailablesOf} with a class that provides a
* method annotated with @{@link JsonPropertyEnumValuesProvider} which returns
* a subset of enum values that would then be passed in argument here.
*
* @copyright 2015-2015 The Helenus Driver Project Authors
*
* @author The Helenus Driver Project Authors
* @version 1 - Nov 20, 2015 - paouelle - Creation
*
* @since 1.0
*/
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@JacksonAnnotation
public @interface JsonPropertyDefaultValuesProvider {}