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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.handler.codec.serialization;
17  
18  import java.io.IOException;
19  import java.io.ObjectOutputStream;
20  import java.io.ObjectStreamClass;
21  import java.io.OutputStream;
22  
23  class CompactObjectOutputStream extends ObjectOutputStream {
24  
25      static final int TYPE_FAT_DESCRIPTOR = 0;
26      static final int TYPE_THIN_DESCRIPTOR = 1;
27  
28      CompactObjectOutputStream(OutputStream out) throws IOException {
29          super(out);
30      }
31  
32      @Override
33      protected void writeStreamHeader() throws IOException {
34          writeByte(STREAM_VERSION);
35      }
36  
37      @Override
38      protected void writeClassDescriptor(ObjectStreamClass desc) throws IOException {
39          Class<?> clazz = desc.forClass();
40          if (clazz.isPrimitive() || clazz.isArray() || clazz.isInterface() ||
41              desc.getSerialVersionUID() == 0) {
42              write(TYPE_FAT_DESCRIPTOR);
43              super.writeClassDescriptor(desc);
44          } else {
45              write(TYPE_THIN_DESCRIPTOR);
46              writeUTF(desc.getName());
47          }
48      }
49  }