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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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 io.netty.handler.codec.serialization;
  
  import java.io.IOException;
  import java.io.ObjectOutputStream;
  import java.io.ObjectStreamClass;
  import java.io.OutputStream;
  
  class CompactObjectOutputStream extends ObjectOutputStream {
  
      static final int TYPE_FAT_DESCRIPTOR = 0;
      static final int TYPE_THIN_DESCRIPTOR = 1;
  
      CompactObjectOutputStream(OutputStream out) throws IOException {
          super(out);
      }
  
      @Override
      protected void writeStreamHeader() throws IOException {
          writeByte(STREAM_VERSION);
      }
  
      @Override
      protected void writeClassDescriptor(ObjectStreamClass desc) throws IOException {
          Class<?> clazz = desc.forClass();
          if (clazz.isPrimitive() || clazz.isArray() || clazz.isInterface() ||
              desc.getSerialVersionUID() == 0) {
              write(TYPE_FAT_DESCRIPTOR);
              super.writeClassDescriptor(desc);
          } else {
              write(TYPE_THIN_DESCRIPTOR);
              writeUTF(desc.getName());
          }
      }
  }