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Java example source code file (Inject.java)

This example Java source code file (Inject.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

annotation, constructor, documented, field, inject, method, retention, target

The Inject.java Java example source code

/**
 * Copyright (C) 2006 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.inject;

import static java.lang.annotation.ElementType.CONSTRUCTOR;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

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

/**
 * Annotates members of your implementation class (constructors, methods
 * and fields) into which the {@link Injector} should inject values.
 * The Injector fulfills injection requests for:
 *
 * <ul>
 * <li>Every instance it constructs. The class being constructed must have
 * exactly one of its constructors marked with {@code @Inject} or must have a
 * constructor taking no parameters. The Injector then proceeds to perform
 * field and method injections.
 * 
 * <li>Pre-constructed instances passed to {@link Injector#injectMembers},
 * {@link com.google.inject.binder.LinkedBindingBuilder#toInstance(Object)} and
 * {@link com.google.inject.binder.LinkedBindingBuilder#toProvider(javax.inject.Provider)}.
 * In this case all constructors are, of course, ignored.
 *
 * <li>Static fields and methods of classes which any {@link Module} has
 * specifically requested static injection for, using
 * {@link Binder#requestStaticInjection}.
 * </ul>
 *
 * In all cases, a member can be injected regardless of its Java access
 * specifier (private, default, protected, public).
 *
 * @author crazybob@google.com (Bob Lee)
 */
@Target({ METHOD, CONSTRUCTOR, FIELD })
@Retention(RUNTIME)
@Documented
public @interface Inject {

  /**
   * If true, and the appropriate binding is not found,
   * the Injector will skip injection of this method or field rather than
   * produce an error. When applied to a field, any default value already
   * assigned to the field will remain (guice will not actively null out the
   * field). When applied to a method, the method will only be invoked if
   * bindings for <i>all parameters are found. When applied to a
   * constructor, an error will result upon Injector creation.
   */
  boolean optional() default false;
}

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