com.google.cloud.dataflow.sdk.coders.AtomicCoder Maven / Gradle / Ivy

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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.coders;

import java.util.Collections;
import java.util.List;

/**
 * A {@link Coder} that has no component {@link Coder Coders} or other state.
 *
 * Note that, unless the behavior is overridden, atomic coders are presumed to be deterministic
 * and all instances are considered equal.
 *
 * @param  the type of the values being transcoded
 */
public abstract class AtomicCoder extends DeterministicStandardCoder {
  protected AtomicCoder() { }

  @Override
  public List> getCoderArguments() {
    return null;
  }

  /**
   * Returns a list of values contained in the provided example
   * value, one per type parameter. If there are no type parameters,
   * returns an empty list.
   *
   * 
Because {@link AtomicCoder} has no components, always returns an empty list.
   *
   * @param exampleValue unused, but part of the latent interface expected by
   * {@link CoderFactories#fromStaticMethods}
   */
  public static  List