com.google.cloud.dataflow.sdk.coders.SetCoder 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 static com.google.common.base.Preconditions.checkArgument;

import com.google.cloud.dataflow.sdk.util.PropertyNames;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * A {@link SetCoder} encodes any {@link Set} using the format of {@link IterableLikeCoder}. The
 * elements may not be in a deterministic order, depending on the {@code Set} implementation.
 *
 * @param  the type of the elements of the set
 */
public class SetCoder extends IterableLikeCoder> {

  /**
   * Produces a {@link SetCoder} with the given {@code elementCoder}.
   */
  public static  SetCoder of(Coder elementCoder) {
    return new SetCoder<>(elementCoder);
  }

  /**
   * Dynamically typed constructor for JSON deserialization.
   */
  @JsonCreator
  public static SetCoder of(
      @JsonProperty(PropertyNames.COMPONENT_ENCODINGS)
      List