Java 类org.apache.commons.codec.binary.BaseNCodec 实例源码

/**
 * The real compactor.
 */
private String compact(final long msb, final long lsb, final BaseNCodec baseN, final int compactLen) {
    final byte[] bytes = new byte[BYTES_PER_2_LONGS];
    int i = BYTES_PER_2_LONGS;
    long x = lsb;
    while (i > BYTES_PER_LONG) {
        bytes[--i] = (byte)x;
        x >>>= Byte.SIZE;
    }
    x = msb;
    while (i > 0) {
        bytes[--i] = (byte)x;
        x >>>= Byte.SIZE;
    }
    // strips any the trailing ======
    return baseN.encodeAsString(bytes).substring(0, compactLen);
}

/**
 * The real expander.
 */
private long[] expand(final String compactUuid, final BaseNCodec baseN) {
    final byte[] bytes = baseN.decode(compactUuid);
    if (bytes.length != BYTES_PER_2_LONGS) {
        throw new IllegalArgumentException("Not a compact uuid string: " + compactUuid);
    }
    int i = 0;
    long msb = bytes[i++];
    while (i < BYTES_PER_LONG) {
        msb = msb << Byte.SIZE | (bytes[i++] & LONG_BYTE_MASK);
    }
    long lsb = bytes[i++];
    while (i < BYTES_PER_2_LONGS) {
        lsb = lsb << Byte.SIZE | (bytes[i++] & LONG_BYTE_MASK);
    }
    return new long[] { msb, lsb };
}

protected static WebArchive getDefaultDeployment(TestContext context) {
    context.setAppEngineWebXmlFile("appengine-web-with-logging-properties.xml");
    WebArchive war = getTckDeployment(context);
    war.addClasses(LoggingTestBase.class, TestBase.class)
        // classes for Base64.isBase64()
        .addClasses(Base64.class, BaseNCodec.class)
        .addClasses(BinaryEncoder.class, Encoder.class)
        .addClasses(BinaryDecoder.class, Decoder.class)
        .addClasses(EncoderException.class, DecoderException.class)
        .addAsWebInfResource("currentTimeUsec.jsp")
        .addAsWebInfResource("doNothing.jsp")
        .addAsWebInfResource("storeTestData.jsp")
        .addAsWebInfResource("throwException.jsp")
        .addAsWebInfResource("log4j-test.properties")
        .addAsWebInfResource("logging-all.properties");
    return war;
}

protected static WebArchive getHelperDeployment() {
    WebArchive war = getTckDeployment();
    war.addClass(DatastoreHelperTestBase.class)
        .addClasses(Base64.class, BaseNCodec.class)
        .addClasses(BinaryEncoder.class, Encoder.class)
        .addClasses(BinaryDecoder.class, Decoder.class)
        .addClasses(EncoderException.class, DecoderException.class);
    return war;
}

public static String base64UrlEncode(byte[] input) {
    Base64 base64 = new Base64(BaseNCodec.MIME_CHUNK_SIZE, EMPTY_BYTE_ARRAY, true);
    return base64.encodeAsString(input);
}