/*
 * 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 com.datastax.driver.core;

import com.datastax.driver.core.utils.Bytes;
import java.util.Arrays;

/**
 * The result of the computation of an MD5 digest.
 *
 * <p>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.
 */
class MD5Digest {

  public final byte[] bytes;

  private MD5Digest(byte[] bytes) {
    this.bytes = bytes;
  }

  public static MD5Digest wrap(byte[] digest) {
    return new MD5Digest(digest);
  }

  @Override
  public final int hashCode() {
    return Arrays.hashCode(bytes);
  }

  @Override
  public final boolean equals(Object o) {
    if (!(o instanceof MD5Digest)) return false;
    MD5Digest that = (MD5Digest) o;
    // handles nulls properly
    return Arrays.equals(this.bytes, that.bytes);
  }

  @Override
  public String toString() {
    return Bytes.toHexString(bytes);
  }
}
