content: /*
   * 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 org.apache.hadoop.chukwa.util;
  
  import java.nio.charset.Charset;
  import java.security.MessageDigest;
  import java.security.NoSuchAlgorithmException;
  
  public class AdaptorNamingUtils {
    
    public static String synthesizeAdaptorID(String adaptorClassName, String dataType,
        String params) throws NoSuchAlgorithmException {
      MessageDigest md;
     md = MessageDigest.getInstance("MD5");
  
      md.update(adaptorClassName.getBytes(Charset.forName("UTF-8")));
      md.update(dataType.getBytes(Charset.forName("UTF-8")));
      md.update(params.getBytes(Charset.forName("UTF-8")));
      StringBuilder sb = new StringBuilder();
      sb.append("adaptor_");
      byte[] bytes = md.digest();
      for(int i=0; i < bytes.length; ++i) {
        if( (bytes[i] & 0xF0) == 0)
          sb.append('0');
        sb.append( Integer.toHexString(0xFF & bytes[i]) );
      }
      return sb.toString();
     
    }
  
  }
  