| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 |
| * |
| * http://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 org.apache.hadoop.hbase.util; |
| |
| import org.apache.hadoop.util.DataChecksum; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * Checksum types. The Checksum type is a one byte number |
| * that stores a representation of the checksum algorithm |
| * used to encode a hfile. The ordinal of these cannot |
| * change or else you risk breaking all existing HFiles out there. |
| */ |
| @InterfaceAudience.Private |
| public enum ChecksumType { |
| |
| NULL((byte)0) { |
| @Override |
| public String getName() { |
| return "NULL"; |
| } |
| |
| @Override public DataChecksum.Type getDataChecksumType() { |
| return DataChecksum.Type.NULL; |
| } |
| }, |
| |
| CRC32((byte)1) { |
| @Override |
| public String getName() { |
| return "CRC32"; |
| } |
| |
| @Override public DataChecksum.Type getDataChecksumType() { |
| return DataChecksum.Type.CRC32; |
| } |
| }, |
| |
| CRC32C((byte)2) { |
| @Override |
| public String getName() { |
| return "CRC32C"; |
| } |
| |
| @Override public DataChecksum.Type getDataChecksumType() { |
| return DataChecksum.Type.CRC32C; |
| } |
| }; |
| |
| private final byte code; |
| |
| public static ChecksumType getDefaultChecksumType() { |
| return ChecksumType.CRC32C; |
| } |
| |
| /** returns the name of this checksum type */ |
| public abstract String getName(); |
| |
| /** Function to get corresponding {@link org.apache.hadoop.util.DataChecksum.Type}. */ |
| public abstract DataChecksum.Type getDataChecksumType(); |
| |
| private ChecksumType(final byte c) { |
| this.code = c; |
| } |
| |
| public byte getCode() { |
| return this.code; |
| } |
| |
| /** |
| * Cannot rely on enum ordinals . They change if item is removed or moved. |
| * Do our own codes. |
| * @param b |
| * @return Type associated with passed code. |
| */ |
| public static ChecksumType codeToType(final byte b) { |
| for (ChecksumType t : ChecksumType.values()) { |
| if (t.getCode() == b) { |
| return t; |
| } |
| } |
| throw new RuntimeException("Unknown checksum type code " + b); |
| } |
| |
| /** |
| * Map a checksum name to a specific type. |
| * Do our own names. |
| * @param name |
| * @return Type associated with passed code. |
| */ |
| public static ChecksumType nameToType(final String name) { |
| for (ChecksumType t : ChecksumType.values()) { |
| if (t.getName().equals(name)) { |
| return t; |
| } |
| } |
| throw new RuntimeException("Unknown checksum type name " + name); |
| } |
| } |