com.speedment.common.injector.annotation.OnlyIfMissing Maven / Gradle / Ivy
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A Speedment bundle that shades all dependencies into one jar. This is
useful when deploying an application on a server.
The newest version!
/*
*
* Copyright (c) 2006-2019, Speedment, Inc. 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 com.speedment.common.injector.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
* Annotates a secondary constructor that should be used when the dependency
* injector creates instances if and only if all the classes specified as its
* value lacks implementations in the context of the injector. It is not enough
* that the types listed have not been created yet, or that they have not yet
* reached a particular state. They must be completely unspecified for the
* annotated constructor to be used.
*
* Note that this annotation is not a replacement for the {@link Inject}
* annotation, but rather a complement.
*
* @author Emil Forslund
* @since 3.1.17
*/
@Inherited
@Target(ElementType.CONSTRUCTOR)
@Retention(RetentionPolicy.RUNTIME)
public @interface OnlyIfMissing {
/**
* Only if all of the classes given by this field are missing
* should the annotated constructor be used to create an instance of the
* class.
*
* @return all the classes that must be missing for the annotated
* constructor to be invoked
*/
Class[] value();
}