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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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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.opensymphony.xwork2.inject;

import static com.opensymphony.xwork2.inject.Container.DEFAULT_NAME;

import static java.lang.annotation.ElementType.*;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;

/**
 * Annotates members and parameters which should have their value[s]
 * injected.
 *
 * @author [email protected] (Bob Lee)
 */
@Target({METHOD, CONSTRUCTOR, FIELD, PARAMETER})
@Retention(RUNTIME)
public @interface Inject {

  /**
   * Dependency name. Defaults to {@link Container#DEFAULT_NAME}.
   */
  String value() default DEFAULT_NAME;

  /**
   * Whether or not injection is required. Applicable only to methods and
   * fields (not constructors or parameters).
   */
  boolean required() default true;
}