/**
* Returns an instance of a padding algorithm given its name.
*
* @param pad the case-insensitive name of the padding algorithm.
* @return an instance of the padding algorithm, operating with a given block size, or <code>null
* </code> if none found.
* @throws InternalError if the implementation does not pass its self-test.
*/
public static final IPad getInstance(String pad) {
if (pad == null) return null;
pad = pad.trim().toLowerCase();
if (pad.endsWith("padding")) pad = pad.substring(0, pad.length() - "padding".length());
IPad result = null;
if (pad.equals(PKCS7_PAD) || pad.equals(PKCS5_PAD)) result = new PKCS7();
else if (pad.equals(TBC_PAD)) result = new TBC();
else if (pad.equals(EME_PKCS1_V1_5_PAD)) result = new PKCS1_V1_5();
else if (pad.equals(SSL3_PAD)) result = new SSL3();
else if (pad.equals(TLS1_PAD)) result = new TLS1();
else if (pad.equals(ISO10126_PAD)) result = new ISO10126();
if (result != null && !result.selfTest()) throw new InternalError(result.name());
return result;
}
@Test
public void shouldGetCorrectPriceForBlackIPad() {
IPad iPad = new BlackIPad();
assertThat(iPad.getPrice(), is(3688));
}
@Test
public void shouldGetCorrectPriceForWhiteIPad() {
IPad iPad = new WhiteIPad(new BlackIPad());
assertThat(iPad.getPrice(), is(3688 + 200));
}
