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/**
 * Copyright 2014 Thomas Feng
 *
 * 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 me.tfeng.play.kafka;

import java.io.IOException;

import org.apache.avro.generic.IndexedRecord;

import kafka.serializer.Decoder;
import kafka.utils.VerifiableProperties;
import me.tfeng.play.avro.AvroHelper;
import me.tfeng.play.common.Constants;

/**
 * @author Thomas Feng ([email protected])
 */
public class AvroDecoder implements Decoder {

  private Class recordClass;

  public AvroDecoder() {
    this((VerifiableProperties) null);
  }

  public AvroDecoder(Class recordClass) {
    this((VerifiableProperties) null);
    this.recordClass = recordClass;
  }

  public AvroDecoder(VerifiableProperties verifiableProperties) {
  }

  @Override
  public T fromBytes(byte[] data) {
    try {
      return AvroHelper.decodeRecord(recordClass, data);
    } catch (IOException e) {
      throw new RuntimeException("Unable to decode Kafka event " +
          new String(data, Constants.UTF8));
    }
  }

  public AvroDecoder setRecordClass(Class recordClass) {
    this.recordClass = recordClass;
    return this;
  }
}