View Javadoc

    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * 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.compression;
    17
    18  import org.jboss.netty.util.internal.jzlib.JZlib;
    19  import org.jboss.netty.util.internal.jzlib.ZStream;
    20
    21  /**
    22   * Utility methods used by {@link ZlibEncoder} and {@link ZlibDecoder}.
    23   *
    24   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    25   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    26   * @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
    27   */
    28  final class ZlibUtil {
    29
    30      static void fail(ZStream z, String message, int resultCode) {
    31          throw exception(z, message, resultCode);
    32      }
    33
    34      static CompressionException exception(ZStream z, String message, int resultCode) {
    35          return new CompressionException(message + " (" + resultCode + ")" +
    36                  (z.msg != null? ": " + z.msg : ""));
    37      }
    38
    39      static Enum<?> convertWrapperType(ZlibWrapper wrapper) {
    40          Enum<?> convertedWrapperType;
    41          switch (wrapper) {
    42          case NONE:
    43              convertedWrapperType = JZlib.W_NONE;
    44              break;
    45          case ZLIB:
    46              convertedWrapperType = JZlib.W_ZLIB;
    47              break;
    48          case GZIP:
    49              convertedWrapperType = JZlib.W_GZIP;
    50              break;
    51          default:
    52              throw new Error();
    53          }
    54          return convertedWrapperType;
    55      }
    56
    57      private ZlibUtil() {
    58          super();
    59      }
    60  }