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 package org.apidesign.api.security;

 import java.nio.ByteBuffer;

 import org.apidesign.spi.security.Digestor;

 /**

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 final class DigestImplementation<Data> {

     private static final DigestorAccessorImpl ACCESSOR = new DigestorAccessorImpl();

     private final Digestor<Data> digestor;

     private final String algorithm;

     private Data data;

     private DigestImplementation(Digestor<Data> digestor, String algorithm, Data d) {

         this.digestor = digestor;

         this.algorithm = algorithm;

         this.data = d;

     }

     static <Data> DigestImplementation create(Digestor<Data> digestor, String algorithm) {

         Data d = ACCESSOR.create(digestor, algorithm);

         if (d == null) {

             return null;

         } else {

             return new DigestImplementation(digestor, algorithm, d);

         }

     }

     byte[] digest(ByteBuffer bb) {

         ACCESSOR.update(digestor, data, bb);

         return ACCESSOR.digest(digestor, data);

     }

 }