content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.csp.sentinel.transport.command.codec;
  
  import java.nio.charset.Charset;
  
  /**
   * The encoder encodes an object of type {@code <R>} into byte array.
   *
   * @param <R> source type
   * @author Eric Zhao
   */
  public interface Encoder<R> {
  
      /**
       * Check whether the encoder supports the given source type.
       *
       * @param clazz type of the class
       * @return {@code true} if supported, {@code false} otherwise
       */
      boolean canEncode(Class<?> clazz);
  
      /**
       * Encode the given object into a byte array with the given charset.
       *
       * @param r the object to encode
       * @param charset the charset
       * @return the encoded byte buffer
       * @throws Exception error occurs when encoding the object (e.g. IO fails)
       */
      byte[] encode(R r, Charset charset) throws Exception;
  
      /**
       * Encode the given object into a byte array with the default charset.
       *
       * @param r the object to encode
       * @return the encoded byte buffer, which is already flipped.
       * @throws Exception error occurs when encoding the object (e.g. IO fails)
       */
      byte[] encode(R r) throws Exception;
  }
  