1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/messagedigest/src-new-api/org/apidesign/api/security/Digest.java	Sat Jun 14 09:52:23 2008 +0200
     1.3 @@ -0,0 +1,44 @@
     1.4 +
     1.5 +package org.apidesign.api.security;
     1.6 +
     1.7 +import java.nio.ByteBuffer;
     1.8 +import org.apidesign.impl.security.friendapi.DigestImplementation;
     1.9 +import org.apidesign.impl.security.friendapi.DigestProvider;
    1.10 +import java.util.ServiceLoader;
    1.11 +
    1.12 +/** MessageDigest extends MessageDigestSpi, that means the javadoc
    1.13 + *
    1.14 + * @author Jaroslav Tulach
    1.15 + */
    1.16 +// BEGIN: day.end.bridges.Digest
    1.17 +public final class Digest {
    1.18 +    private final DigestImplementation impl;
    1.19 +    
    1.20 +    /** Factory method is better than constructor */
    1.21 +    private Digest(DigestImplementation impl) {
    1.22 +        this.impl = impl;
    1.23 +    }
    1.24 +    
    1.25 +    /** Factory method to create digest for an algorithm.
    1.26 +     */
    1.27 +    public static Digest getInstance(String algorithm) {
    1.28 +        for (DigestProvider dp : ServiceLoader.load(DigestProvider.class)) {
    1.29 +            DigestImplementation impl = dp.create(algorithm);
    1.30 +            if (impl != null) {
    1.31 +                return new Digest(impl);
    1.32 +            }
    1.33 +        }
    1.34 +        throw new IllegalArgumentException(algorithm);
    1.35 +    }
    1.36 +      
    1.37 +    //
    1.38 +    // these methods are kept the same as in original MessageDigest,
    1.39 +    // but for simplicity choose just some from the original API
    1.40 +    //
    1.41 +    
    1.42 +    public byte[] digest(ByteBuffer bb) {
    1.43 +        impl.update(bb);
    1.44 +        return impl.digest();
    1.45 +    }
    1.46 +}
    1.47 +// END: day.end.bridges.Digest