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
   *
   *     https://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.avro.io;
  
  import java.io.ByteArrayOutputStream;
  import java.io.IOException;
  
  import org.apache.avro.Schema;
  
  /**
   * Write data of a schema.
   * <p>
   * Implemented for different in-memory data representations.
   */
  public interface DatumWriter<D> {
  
    /** Set the schema. */
    void setSchema(Schema schema);
  
    /**
     * Write a datum. Traverse the schema, depth first, writing each leaf value in
     * the schema from the datum to the output.
     */
    void write(D datum, Encoder out) throws IOException;
  
    /**
     * Convenience method to Write a datum to a byte array. Traverse the schema,
     * depth first, writing each leaf value in the schema from the datum to the byte
     * array.
     *
     * @param datum The datum to serialize
     * @return The serialized datum stored in an array of bytes
     */
    default byte[] toByteArray(D datum) throws IOException {
      try (ByteArrayOutputStream out = new ByteArrayOutputStream(128)) {
        write(datum, EncoderFactory.get().directBinaryEncoder(out, null));
        return out.toByteArray();
      }
    }
  }
  