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1   /*
2    * Copyright 2013 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.spdy;
17  
18  import org.jboss.netty.buffer.ChannelBuffer;
19  import org.jboss.netty.util.internal.DetectionUtil;
20  
21  abstract class SpdyHeaderBlockEncoder {
22  
23      static SpdyHeaderBlockEncoder newInstance(
24              SpdyVersion spdyVersion, int compressionLevel, int windowBits, int memLevel) {
25  
26          if (DetectionUtil.javaVersion() >= 7) {
27              return new SpdyHeaderBlockZlibEncoder(
28                      spdyVersion, compressionLevel);
29          } else {
30              return new SpdyHeaderBlockJZlibEncoder(
31                      spdyVersion, compressionLevel, windowBits, memLevel);
32          }
33      }
34  
35      abstract ChannelBuffer encode(SpdyHeadersFrame frame) throws Exception;
36      abstract void end();
37  }