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Java example source code file (Nullability.java)

This example Java source code file (Nullability.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.

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Java - Java tags/keywords

annotation, class, nullability, nullable

The Nullability.java Java example source code

 * Copyright (C) 2010 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.internal;

import java.lang.annotation.Annotation;

 * Whether a member supports null values injected.
 * <p>Support for {@code Nullable} annotations in Guice is loose.
 * Any annotation type whose simplename is "Nullable" is sufficient to indicate
 * support for null values injected.
 * <p>This allows support for JSR-305's
 * <a href="http://groups.google.com/group/jsr-305/web/proposed-annotations">
 * javax.annotation.meta.Nullable</a> annotation and IntelliJ IDEA's
 * <a href="http://www.jetbrains.com/idea/documentation/howto.html">
 * org.jetbrains.annotations.Nullable</a>.
 * @author jessewilson@google.com (Jesse Wilson)
public class Nullability {
  private Nullability() {}

  public static boolean allowsNull(Annotation[] annotations) {
    for(Annotation a : annotations) {
      Class<? extends Annotation> type = a.annotationType();
      if ("Nullable".equals(type.getSimpleName())) {
        return true;
    return false;

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