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Java example source code file (Bind.java)

This example Java source code file (Bind.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, bind, class, field, retention, target

The Bind.java Java example source code

/*
 * Copyright (C) 2014 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.testing.fieldbinder;

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

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

/**
 * Annotation used by {@link BoundFieldModule} to indicate that a field should be bound to its
 * value using Guice.
 *
 * <p>Binding to {@code null} is only allowed for fields that are annotated {@code @Nullable}. See
 * <a href="https://github.com/google/guice/wiki/UseNullable">https://github.com/google/guice/wiki/UseNullable
 *
 * @see BoundFieldModule
 * @author eatnumber1@google.com (Russ Harmon)
 */
@Retention(RUNTIME)
@Target({FIELD})
public @interface Bind {
  /**
   * If specified, {@link BoundFieldModule} will bind the annotated field's value to this type,
   * rather than to the field's actual type.
   */
  Class<?> to() default Bind.class;

  /**
   * If true, {@link BoundFieldModule} will delay reading the field until injection time
   * rather than eagerly reading it at configure time.
   *
   * <p>When used with Provider valued fields, the provider will be read from the field and
   * {@code .get()} will be called for each provision.  This may be useful for testing provision
   * failures.
   */
  boolean lazy() default false;
}

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