/**
* Create a revision as a child of another revision.
*
* @param parent Parent revision, or null if this is the root revision.
*/
public Revision(GVCLib gvclib, Revision parent, Map<String, Set<File>> fileSet, String comment)
throws GVCException {
this.parent = parent;
this.date = new Date();
this.comment = comment;
if (parent == null) {
// This is the initial revision.
this.filesAdded = fileSet;
} else {
// Diff the given file set with parent's file set to get added and removed.
List<Map<String, Set<File>>> diffList = filesetGetDiff(parent.getFileset(gvclib), fileSet);
this.filesAdded = diffList.get(0);
this.filesRemoved = diffList.get(1);
}
if (this.filesAdded == null && this.filesRemoved == null) {
throw new GVCException("Will not create a revision with no changes.");
}
this.serialize();
// Generate hash.
MD5 md5 = new MD5();
try {
md5.Update(this.serialized, null);
} catch (UnsupportedEncodingException e) {
throw new GVCException(e);
}
this.hash = md5.asHex();
}
/**
* Returns array of bytes (16 bytes) representing hash as of the current state of this object.
* Note: getting a hash does not invalidate the hash object, it only creates a copy of the real
* state which is finalized.
*
* @return Array of 16 bytes, the hash of all updated bytes
*/
public synchronized byte[] Final() {
byte bits[];
int index, padlen;
MD5State fin;
if (finals == null) {
fin = new MD5State(state);
int[] count_ints = {(int) (fin.count << 3), (int) (fin.count >> 29)};
bits = Encode(count_ints, 8);
index = (int) (fin.count & 0x3f);
padlen = (index < 56) ? (56 - index) : (120 - index);
Update(fin, padding, 0, padlen);
Update(fin, bits, 0, 8);
/* Update() sets finals to null */
finals = fin;
}
return Encode(finals.state, 16);
}
/**
* Update buffer with given string using the given encoding. If the given encoding is null, the
* encoding "ISO8859_1" is used.
*
* @param s String to be update to hash (is used as s.getBytes(charset_name))
* @param charset_name The character set to use to convert s to a byte array, or null if the
* "ISO8859_1" character set is desired.
* @exception java.io.UnsupportedEncodingException If the named charset is not supported.
*/
public void Update(String s, String charset_name) throws UnsupportedEncodingException {
if (charset_name == null) charset_name = "ISO8859_1";
byte chars[] = s.getBytes(charset_name);
Update(chars, chars.length);
}
/**
* Update buffer with a single integer (only & 0xff part is used, as a byte)
*
* @param i Integer value, which is then converted to byte as i & 0xff
*/
public void Update(int i) {
Update((byte) (i & 0xff));
}
/**
* Update buffer with given string. Note that because the version of the s.getBytes() method
* without parameters is used to convert the string to a byte array, the results of this method
* may be different on different platforms. The s.getBytes() method converts the string into a
* byte array using the current platform's default character set and may therefore have different
* results on platforms with different default character sets. If a version that works
* consistently across platforms with different default character sets is desired, use the
* overloaded version of the Update() method which takes a string and a character encoding.
*
* @param s String to be update to hash (is used as s.getBytes())
*/
public void Update(String s) {
byte chars[] = s.getBytes();
Update(chars, chars.length);
}
/**
* Updates hash with a single byte
*
* @param b Single byte to update the hash
*/
public void Update(byte b) {
byte buffer[] = new byte[1];
buffer[0] = b;
Update(buffer, 1);
}
/**
* Updates hash with given array of bytes
*
* @param buffer Array of bytes to use for updating the hash
*/
public void Update(byte buffer[]) {
Update(buffer, 0, buffer.length);
}
public void Update(byte buffer[], int length) {
Update(this.state, buffer, 0, length);
}
/**
* Initialize class, and update hash with ob.toString()
*
* @param ob Object, ob.toString() is used to update hash after initialization
*/
public MD5(Context context, Object ob) {
this(context);
Update(ob.toString());
}
