com.datastax.driver.core.MD5Digest Maven / Gradle / Ivy

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/*
 * Copyright DataStax, Inc.
 *
 * Licensed 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.
 *
 * 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);
  }
}