1.1 --- a/samples/messagedigest/src/api/Digest.java	Sat Jun 14 09:51:45 2008 +0200
     1.2 +++ b/samples/messagedigest/src/api/Digest.java	Sat Jun 14 09:51:46 2008 +0200
     1.3 @@ -1,13 +1,19 @@
     1.4  
     1.5  package api;
     1.6  
     1.7 +import java.nio.ByteBuffer;
     1.8 +import spi.DigestImplementation;
     1.9 +
    1.10  /** MessageDigest extends MessageDigestSpi, that means the javadoc
    1.11   *
    1.12   * @author Jaroslav Tulach
    1.13   */
    1.14  public final class Digest {
    1.15 +    private final DigestImplementation impl;
    1.16 +
    1.17      /** Factory method is better than constructor */
    1.18 -    private Digest() {
    1.19 +    private Digest(DigestImplementation impl) {
    1.20 +        this.impl = impl;
    1.21      }
    1.22      
    1.23      /** Factory method to create digest for an algorithm.
    1.24 @@ -16,6 +22,13 @@
    1.25          return null;
    1.26      }
    1.27        
    1.28 +    //
    1.29 +    // these methods are kept the same as in original MessageDigest,
    1.30 +    // but for simplicity choose just some from the original API
    1.31 +    //
    1.32      
    1.33 +    public byte[] digest(ByteBuffer bb) {
    1.34 +        return null;
    1.35 +    }
    1.36              
    1.37  }

     2.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     2.2 +++ b/samples/messagedigest/src/spi/DigestImplementation.java	Sat Jun 14 09:51:46 2008 +0200
     2.3 @@ -0,0 +1,23 @@
     2.4 +/*
     2.5 + * To change this template, choose Tools | Templates
     2.6 + * and open the template in the editor.
     2.7 + */
     2.8 +
     2.9 +package spi;
    2.10 +
    2.11 +import java.nio.ByteBuffer;
    2.12 +
    2.13 +/**
    2.14 + *
    2.15 + * @author Jaroslav Tulach
    2.16 + */
    2.17 +public abstract class DigestImplementation {
    2.18 +    final String name;
    2.19 +    
    2.20 +    protected DigestImplementation(String algorithm) {
    2.21 +        this.name = algorithm;
    2.22 +    }
    2.23 +    
    2.24 +    protected abstract void update(ByteBuffer bb);
    2.25 +    protected abstract byte[] digest();
    2.26 +}