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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.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  final class ZlibUtil {
    25
    26      static void fail(ZStream z, String message, int resultCode) {
    27          throw exception(z, message, resultCode);
    28      }
    29
    30      static CompressionException exception(ZStream z, String message, int resultCode) {
    31          return new CompressionException(message + " (" + resultCode + ")" +
    32                  (z.msg != null? ": " + z.msg : ""));
    33      }
    34
    35      static Enum<?> convertWrapperType(ZlibWrapper wrapper) {
    36          Enum<?> convertedWrapperType;
    37          switch (wrapper) {
    38          case NONE:
    39              convertedWrapperType = JZlib.W_NONE;
    40              break;
    41          case ZLIB:
    42              convertedWrapperType = JZlib.W_ZLIB;
    43              break;
    44          case GZIP:
    45              convertedWrapperType = JZlib.W_GZIP;
    46              break;
    47          case ZLIB_OR_NONE:
    48              convertedWrapperType = JZlib.W_ZLIB_OR_NONE;
    49              break;
    50          default:
    51              throw new Error();
    52          }
    53          return convertedWrapperType;
    54      }
    55
    56      private ZlibUtil() {
    57          super();
    58      }
    59  }