jtulach@44: 
jtulach@44: package org.apidesign.api.security;
jtulach@44: 
jtulach@44: import java.nio.ByteBuffer;
jtulach@44: import java.util.ServiceLoader;
jtulach@51: import org.apidesign.spi.security.Digestor;
jtulach@44: 
jtulach@51: /** Simplified version of a Digest class that allows to compute a fingerprint
jtulach@51:  * for buffer of data.
jtulach@44:  *
jtulach@51:  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
jtulach@44:  */
jtulach@44: // BEGIN: day.end.bridges.Digest
jtulach@44: public final class Digest {
jtulach@301:     private final DigestImpl<?> impl;
jtulach@44:     
jtulach@44:     /** Factory method is better than constructor */
jtulach@301:     private Digest(DigestImpl<?> impl) {
jtulach@44:         this.impl = impl;
jtulach@44:     }
jtulach@44:     
jtulach@44:     /** Factory method to create digest for an algorithm.
jtulach@44:      */
jtulach@44:     public static Digest getInstance(String algorithm) {
jtulach@51:         for (Digestor<?> digestor : ServiceLoader.load(Digestor.class)) {
jtulach@301:             DigestImpl<?> impl = DigestImpl.create(
jtulach@154:                 digestor, algorithm
jtulach@154:             );
jtulach@44:             if (impl != null) {
jtulach@44:                 return new Digest(impl);
jtulach@44:             }
jtulach@44:         }
jtulach@44:         throw new IllegalArgumentException(algorithm);
jtulach@44:     }
jtulach@44:       
jtulach@44:     //
jtulach@44:     // these methods are kept the same as in original MessageDigest,
jtulach@44:     // but for simplicity choose just some from the original API
jtulach@44:     //
jtulach@44:     
jtulach@44:     public byte[] digest(ByteBuffer bb) {
jtulach@51:         return impl.digest(bb);
jtulach@44:     }
jtulach@44: }
jtulach@44: // END: day.end.bridges.Digest