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/*
 * 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.reef.wake.remote.impl;

import com.google.protobuf.InvalidProtocolBufferException;
import org.apache.reef.wake.remote.Decoder;
import org.apache.reef.wake.remote.exception.RemoteRuntimeException;
import org.apache.reef.wake.remote.proto.WakeRemoteProtos.WakeTuplePBuf;

import java.util.Map;

/**
 * Decoder using the WakeTuple protocol buffer.
 * (class name and bytes)
 *
 * @param  type
 */
public class MultiDecoder implements Decoder {
  private final Map, Decoder> clazzToDecoderMap;

  /**
   * Constructs a decoder that decodes bytes based on the class name.
   *
   * @param clazzToDecoderMap a map of decoder for class
   */
  public MultiDecoder(final Map, Decoder> clazzToDecoderMap) {
    this.clazzToDecoderMap = clazzToDecoderMap;
  }

  /**
   * Decodes byte array.
   *
   * @param data class name and byte payload
   */
  @Override
  public T decode(final byte[] data) {
    final WakeTuplePBuf tuple;
    try {
      tuple = WakeTuplePBuf.parseFrom(data);
    } catch (final InvalidProtocolBufferException e) {
      e.printStackTrace();
      throw new RemoteRuntimeException(e);
    }

    final String className = tuple.getClassName();
    final byte[] message = tuple.getData().toByteArray();
    final Class clazz;
    try {
      clazz = Class.forName(className);
    } catch (final ClassNotFoundException e) {
      e.printStackTrace();
      throw new RemoteRuntimeException(e);
    }
    return clazzToDecoderMap.get(clazz).decode(message);
  }
}