it.tidalwave.integritychecker.fingerprint.Fingerprint Maven / Gradle / Ivy

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This module provides the core function for checking the integrity of files.

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/*
 * #%L
 * *********************************************************************************************************************
 * 
 * SolidBlue - open source safe data
 * http://solidblue.tidalwave.it - hg clone https://bitbucket.org/tidalwave/solidblue-src
 * %%
 * Copyright (C) 2011 - 2013 Tidalwave s.a.s. (http://tidalwave.it)
 * %%
 * *********************************************************************************************************************
 * 
 * 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.
 * 
 * *********************************************************************************************************************
 * 
 * $Id$
 * 
 * *********************************************************************************************************************
 * #L%
 */
package it.tidalwave.integritychecker.fingerprint;

import javax.annotation.Nonnull;
import javax.annotation.concurrent.Immutable;
import java.io.Serializable;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.ToString;

/***********************************************************************************************************************
 * 
 * A fingerprint computed with a given algorithm.
 * 
 * @author  Fabrizio Giudici
 * @version $Id$
 *
 **********************************************************************************************************************/
@Immutable @RequiredArgsConstructor @ToString @EqualsAndHashCode @Getter
public class Fingerprint implements Serializable
  {
    @Nonnull
    private final String type;
    
    @Nonnull
    private final String value;
    
    public Fingerprint (final @Nonnull String algorithm, final @Nonnull byte[] digest)
      {
        this(algorithm, toString(digest));
      }
    
    @Nonnull
    private static String toString (final @Nonnull byte[] bytes)
      {
        final StringBuilder builder = new StringBuilder();
        
        for (final byte b : bytes)
          {
            final int value = b & 0xff;
            builder.append(Integer.toHexString(value >>> 4)).append(Integer.toHexString(value & 0x0f));
          }
        
        return builder.toString();
      }
  }