content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.beam.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 Validation} represents a set of annotations that can be used to annotate getter properties
   * on {@link PipelineOptions} with information representing the validation criteria to be used when
   * validating with the {@link PipelineOptionsValidator}.
   */
  public @interface Validation {
    /**
     * This criteria specifies that the value must be not null. Note that this annotation should only
     * be applied to methods that return nullable objects.
     */
    @Target(value = ElementType.METHOD)
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @interface Required {
      /**
       * The groups that the annotated attribute is a member of. A member can be in 0 or more groups.
       * Members not in any groups are considered to be in a group consisting exclusively of
       * themselves. At least one member of a group must be non-null if the options are to be valid.
       */
      String[] groups() default {};
    }
  }
  