| /* |
| * 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.cassandra.utils; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.charset.StandardCharsets; |
| import java.util.Arrays; |
| |
| |
| /** |
| * The result of the computation of an MD5 digest. |
| * |
| * A MD5 is really just a byte[] but arrays are a no go as map keys. We could |
| * wrap it in a ByteBuffer but: |
| * 1. MD5Digest is a more explicit name than ByteBuffer to represent a md5. |
| * 2. Using our own class allows to use our FastByteComparison for equals. |
| */ |
| public class MD5Digest |
| { |
| public final byte[] bytes; |
| private final int hashCode; |
| |
| private MD5Digest(byte[] bytes) |
| { |
| this.bytes = bytes; |
| hashCode = Arrays.hashCode(bytes); |
| } |
| |
| public static MD5Digest wrap(byte[] digest) |
| { |
| return new MD5Digest(digest); |
| } |
| |
| public static MD5Digest compute(byte[] toHash) |
| { |
| return new MD5Digest(FBUtilities.threadLocalMD5Digest().digest(toHash)); |
| } |
| |
| public static MD5Digest compute(String toHash) |
| { |
| return compute(toHash.getBytes(StandardCharsets.UTF_8)); |
| } |
| |
| public ByteBuffer byteBuffer() |
| { |
| return ByteBuffer.wrap(bytes); |
| } |
| |
| @Override |
| public final int hashCode() |
| { |
| return hashCode; |
| } |
| |
| @Override |
| public final boolean equals(Object o) |
| { |
| if(!(o instanceof MD5Digest)) |
| return false; |
| MD5Digest that = (MD5Digest)o; |
| // handles nulls properly |
| return FBUtilities.compareUnsigned(this.bytes, that.bytes, 0, 0, this.bytes.length, that.bytes.length) == 0; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return Hex.bytesToHex(bytes); |
| } |
| } |