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.extensions.ml;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.api.client.googleapis.util.Utils;
  import com.google.api.client.json.GenericJson;
  import com.google.api.client.json.JsonFactory;
  import java.io.IOException;
  import org.apache.beam.sdk.coders.Coder;
  import org.apache.beam.sdk.coders.StringUtf8Coder;
  
  /**
   * Can be used as a coder for any object that extends GenericJson. This includes all objects in the
   * Google Genomics Java client library.
   */
  public class GenericJsonCoder<T extends GenericJson> extends DelegatingAtomicCoder<T, String> {
  
    private static final JsonFactory JSON_FACTORY = Utils.getDefaultJsonFactory();
    private static final Coder<String> STRING_CODER = StringUtf8Coder.of();
    private final Class<T> type;
  
    private GenericJsonCoder(Class<T> type) {
      super(STRING_CODER);
      this.type = type;
    }
  
    public static <T extends GenericJson> GenericJsonCoder<T> of(Class<T> type) {
      return new GenericJsonCoder<>(type);
    }
  
    @JsonCreator
    @SuppressWarnings("unchecked")
    public static <T extends GenericJson> GenericJsonCoder<T> of(@JsonProperty("type") String type)
        throws ClassNotFoundException {
      return of((Class<T>) Class.forName(type));
    }
  
    @Override
    protected T from(String object) throws IOException {
      return JSON_FACTORY.fromString(object, type);
    }
  
    @Override
    protected String to(T object) throws IOException {
      return JSON_FACTORY.toString(object);
    }
  }
  