content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.csp.binary.codec;
  
  import io.activej.bytebuf.ByteBuf;
  import io.activej.bytebuf.ByteBufs;
  import io.activej.common.exception.MalformedDataException;
  import io.activej.common.function.DecoderFunction;
  import org.jetbrains.annotations.Nullable;
  
  import java.util.function.Function;
  
  public interface ByteBufsCodec<I, O> {
  	ByteBuf encode(O item);
  
  	@Nullable I tryDecode(ByteBufs bufs) throws MalformedDataException;
  
  	default <I1, O1> ByteBufsCodec<I1, O1> transform(DecoderFunction<? super I, ? extends I1> decoder, Function<? super O1, ? extends O> encoder) {
  		return new ByteBufsCodec<>() {
  			@Override
  			public ByteBuf encode(O1 item) {
  				return ByteBufsCodec.this.encode(encoder.apply(item));
  			}
  
  			@Override
  			public @Nullable I1 tryDecode(ByteBufs bufs) throws MalformedDataException {
  				I maybeResult = ByteBufsCodec.this.tryDecode(bufs);
  				if (maybeResult == null) return null;
  				return decoder.decode(maybeResult);
  			}
  		};
  	}
  }
  