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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 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.
public abstract class AbstractIDMigrator implements IDMigrator {
  private static final Charset UTF8_CHARSET = Charset.forName("UTF8");
  private final MessageDigest md5Digest;
  protected AbstractIDMigrator() {
    try {
       = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException nsae) {
      // Can't happen
      throw new IllegalStateException(nsae);
  protected final long hash(String value) {
    byte[] md5hash;
    synchronized () {
      md5hash = .digest(value.getBytes());
    long hash = 0L;
    for (int i = 0; i < 8; i++) {
      hash = (hash << 8) | (md5hash[i] & 0x00000000000000FFL);
    return hash;
  public long toLongID(String stringIDthrows TasteException {
    long longID = hash(stringID);
    return longID;
  public void initialize(Iterable<StringstringIDsthrows TasteException {
    for (String stringID : stringIDs) {
  protected abstract void storeMapping(long longIDString stringIDthrows TasteException;
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