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/*
 * 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:
 *
 * 
    *
  • 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. *
  • 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. *
  • Static fields and methods of classes which any {@link Module} has specifically requested * static injection for, using {@link Binder#requestStaticInjection}. *
* * In all cases, a member can be injected regardless of its Java access specifier (private, default, * protected, public). * * @author [email protected] (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 all parameters are * found. When applied to a constructor, an error will result upon Injector creation. */ boolean optional() default false; }




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