1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/samples/messagedigest/src-new-api/org/apidesign/impl/DigestorAccessor.java	Sat Jun 14 09:52:25 2008 +0200
     1.3 @@ -0,0 +1,53 @@
     1.4 +/*
     1.5 + * To change this template, choose Tools | Templates
     1.6 + * and open the template in the editor.
     1.7 + */
     1.8 +
     1.9 +package org.apidesign.impl;
    1.10 +
    1.11 +import java.nio.ByteBuffer;
    1.12 +import org.apidesign.spi.security.Digestor;
    1.13 +
    1.14 +/**
    1.15 + *
    1.16 + * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
    1.17 + */
    1.18 +public abstract class DigestorAccessor {
    1.19 +    private static DigestorAccessor INSTANCE;
    1.20 +    
    1.21 +    protected DigestorAccessor() {
    1.22 +        if (this.getClass().getName().equals("org.apidesign.spi.security.DigestorAccessorImpl")) {
    1.23 +            assert INSTANCE == null;
    1.24 +            INSTANCE = this;
    1.25 +            return;
    1.26 +        }
    1.27 +        if (this.getClass().getName().equals("org.apidesign.api.security.DigestorAccessorImpl")) {
    1.28 +            return;
    1.29 +        }
    1.30 +        throw new IllegalStateException();
    1.31 +    }
    1.32 +    
    1.33 +    final DigestorAccessor getDefault() {
    1.34 +        try {
    1.35 +            Class.forName(Digestor.class.getName(), true, DigestorAccessor.class.getClassLoader());
    1.36 +            return INSTANCE;
    1.37 +        } catch (ClassNotFoundException ex) {
    1.38 +            throw new IllegalStateException(ex);
    1.39 +        }
    1.40 +    }
    1.41 +    
    1.42 +    protected abstract <Data> byte[] digest(Digestor<Data> dig, Data data);
    1.43 +    protected abstract <Data> Data create(Digestor<Data> dig, String algorithm); 
    1.44 +    protected abstract <Data> void update(Digestor<Data> dig, Data data, ByteBuffer input);
    1.45 +    
    1.46 +    
    1.47 +    protected final <Data> byte[] defaultDigest(Digestor<Data> dig, Data data) {
    1.48 +        return getDefault().digest(dig, data);
    1.49 +    }
    1.50 +    protected final <Data> Data defaultCreate(Digestor<Data> dig, String algorithm) {
    1.51 +        return getDefault().create(dig, algorithm);
    1.52 +    }
    1.53 +    protected final <Data> void defaultUpdate(Digestor<Data> dig, Data data, ByteBuffer input) {
    1.54 +        getDefault().update(dig, data, input);
    1.55 +    }
    1.56 +}