Android Open Source - AUIL-for-volley Md5 File Name Generator

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The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2011-2013 Sergey Tarasevich
 *//from   www  . j  a va  2  s  .  c  o m
 * 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.nostra13.universalimageloader.cache.disc.naming;

import com.nostra13.universalimageloader.utils.L;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * Names image file as MD5 hash of image URI
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.4.0
 */
public class Md5FileNameGenerator implements FileNameGenerator {

  private static final String HASH_ALGORITHM = "MD5";
  private static final int RADIX = 10 + 26; // 10 digits + 26 letters

  @Override
  public String generate(String imageUri) {
    byte[] md5 = getMD5(imageUri.getBytes());
    BigInteger bi = new BigInteger(md5).abs();
    return bi.toString(RADIX);
  }

  private byte[] getMD5(byte[] data) {
    byte[] hash = null;
    try {
      MessageDigest digest = MessageDigest.getInstance(HASH_ALGORITHM);
      digest.update(data);
      hash = digest.digest();
    } catch (NoSuchAlgorithmException e) {
      L.e(e);
    }
    return hash;
  }
}

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