com.google.common.annotations.GwtCompatible Maven / Gradle / Ivy
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/*
* Copyright (C) 2009 Google Inc.
*
* 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 com.google.common.annotations;
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;
/**
* The presence of this annotation on a type indicates that the type may be
* used with the
* Google Web Toolkit (GWT).
* When applied to a method, the return type of the method is GWT compatible.
* It's useful to indicate that an instance created by factory methods has a GWT
* serializable type. In the following example,
*
*
* {@literal @}GwtCompatible
* class Lists {
* ...
* {@literal @}GwtCompatible(serializable = true)
* static <E> List<E> newArrayList(E... elements) {
* ...
* }
* }
*
* The return value of {@code Lists.newArrayList(E[])} has GWT
* serializable type. It is also useful in specifying contracts of interface
* methods. In the following example,
*
*
* {@literal @}GwtCompatible
* interface ListFactory {
* ...
* {@literal @}GwtCompatible(serializable = true)
* <E> List<E> newArrayList(E... elements);
* }
*
* The {@code newArrayList(E[])} method of all implementations of {@code
* ListFactory} is expected to return a value with a GWT serializable type.
*
* Note that a {@code GwtCompatible} type may have some {@link
* GwtIncompatible} methods.
*
* @author Charles Fry
* @author Hayward Chan
*/
@Retention(RetentionPolicy.CLASS)
@Target({ ElementType.TYPE, ElementType.METHOD })
// @Documented - uncomment when GWT support is official
@GwtCompatible
public @interface GwtCompatible {
/**
* When {@code true}, the annotated type or the type of the method return
* value is GWT serializable.
*
* @see
* Documentation about GWT serialization
*/
boolean serializable() default false;
/**
* When {@code true}, the annotated type is emulated in GWT. The emulated
* source (also known as super-source) is different from the implementation
* used by the JVM.
*
* @see
* Documentation about GWT emulated source
*/
boolean emulated() default false;
}