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Google Cloud Dataflow Java SDK provides a simple, Java-based interface for processing virtually any size data using Google cloud resources. This artifact includes entire Dataflow Java SDK.
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/*
 * Copyright (C) 2015 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.cloud.dataflow.sdk.options;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * {@link Default} represents a set of annotations that can be used to annotate getter properties
 * on {@link PipelineOptions} with information representing the default value to be returned
 * if no value is specified.
 */
public @interface Default {
  /**
   * This represents that the default of the option is the specified {@link java.lang.Class} value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Class {
    java.lang.Class value();
  }

  /**
   * This represents that the default of the option is the specified {@link java.lang.String}
   * value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface String {
    java.lang.String value();
  }

  /**
   * This represents that the default of the option is the specified boolean primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Boolean {
    boolean value();
  }

  /**
   * This represents that the default of the option is the specified char primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Character {
    char value();
  }

  /**
   * This represents that the default of the option is the specified byte primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Byte {
    byte value();
  }
  /**
   * This represents that the default of the option is the specified short primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Short {
    short value();
  }
  /**
   * This represents that the default of the option is the specified int primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Integer {
    int value();
  }

  /**
   * This represents that the default of the option is the specified long primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Long {
    long value();
  }

  /**
   * This represents that the default of the option is the specified float primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Float {
    float value();
  }

  /**
   * This represents that the default of the option is the specified double primitive value.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Double {
    double value();
  }

  /**
   * This represents that the default of the option is the specified enum.
   * The value should equal the enum's {@link java.lang.Enum#name() name}.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface Enum {
    java.lang.String value();
  }

  /**
   * Value must be of type {@link DefaultValueFactory} and have a default constructor.
   * Value is instantiated and then used as a factory to generate the default.
   *
   * See {@link DefaultValueFactory} for more details.
   */
  @Target(ElementType.METHOD)
  @Retention(RetentionPolicy.RUNTIME)
  @Documented
  public @interface InstanceFactory {
    java.lang.Class> value();
  }
}