annotations.java

Guice是轻量级的依赖注入框架。简而言之

/**
 * 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.util;

import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * Annotation utilities.
 *
 * @author [e-mail] (Bob Lee)
 */
public class Annotations {

  /**
   * Returns true if the given annotation is retained at runtime.
   */
  public static boolean isRetainedAtRuntime(
      Class<? extends Annotation> annotationType) {
    Retention retention = annotationType.getAnnotation(Retention.class);
    return !(retention == null || retention.value() != RetentionPolicy.RUNTIME);
  }
}