mirror of
https://github.com/rn10950/RetroZilla.git
synced 2024-11-15 04:00:12 +01:00
274 lines
7.5 KiB
Java
274 lines
7.5 KiB
Java
/* ***** BEGIN LICENSE BLOCK *****
|
|
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|
*
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
* http://www.mozilla.org/MPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
* for the specific language governing rights and limitations under the
|
|
* License.
|
|
*
|
|
* The Original Code is Java XPCOM Bindings.
|
|
*
|
|
* The Initial Developer of the Original Code is
|
|
* IBM Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 2005
|
|
* IBM Corporation. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
* Javier Pedemonte (jhpedemonte@gmail.com)
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
|
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|
* in which case the provisions of the GPL or the LGPL are applicable instead
|
|
* of those above. If you wish to allow use of your version of this file only
|
|
* under the terms of either the GPL or the LGPL, and not to allow others to
|
|
* use your version of this file under the terms of the MPL, indicate your
|
|
* decision by deleting the provisions above and replace them with the notice
|
|
* and other provisions required by the GPL or the LGPL. If you do not delete
|
|
* the provisions above, a recipient may use your version of this file under
|
|
* the terms of any one of the MPL, the GPL or the LGPL.
|
|
*
|
|
* ***** END LICENSE BLOCK ***** */
|
|
|
|
package org.mozilla.xpcom;
|
|
|
|
import java.util.Enumeration;
|
|
import java.util.StringTokenizer;
|
|
|
|
import org.mozilla.interfaces.nsISupports;
|
|
import org.mozilla.interfaces.nsIVersionComparator;
|
|
|
|
|
|
/**
|
|
* Version strings are dot-separated sequences of version-parts.
|
|
* <p>
|
|
* A version-part consists of up to four parts, all of which are optional:
|
|
* <br><code>
|
|
* <number-a><string-b><number-c>
|
|
* <string-d (everything else)>
|
|
* </code> <p>
|
|
* A version-part may also consist of a single asterisk "*" which indicates
|
|
* "infinity".
|
|
* <p>
|
|
* Numbers are base-10, and are zero if left out.
|
|
* Strings are compared bytewise.
|
|
* <p>
|
|
* For additional backwards compatibility, if "string-b" is "+" then
|
|
* "number-a" is incremented by 1 and "string-b" becomes "pre".
|
|
* <p> <pre>
|
|
* 1.0pre1
|
|
* < 1.0pre2
|
|
* < 1.0 == 1.0.0 == 1.0.0.0
|
|
* < 1.1pre == 1.1pre0 == 1.0+
|
|
* < 1.1pre1a
|
|
* < 1.1pre1
|
|
* < 1.1pre10a
|
|
* < 1.1pre10
|
|
* </pre>
|
|
* Although not required by this interface, it is recommended that
|
|
* numbers remain within the limits of a signed char, i.e. -127 to 128.
|
|
*/
|
|
public class VersionComparator implements nsIVersionComparator {
|
|
|
|
public nsISupports queryInterface(String aIID) {
|
|
return Mozilla.queryInterface(this, aIID);
|
|
}
|
|
|
|
/**
|
|
* Compare two version strings
|
|
* @param A a version string
|
|
* @param B a version string
|
|
* @return a value less than 0 if A < B;
|
|
* the value 0 if A == B;
|
|
* or a value greater than 0 if A > B
|
|
*/
|
|
public int compare(String A, String B) {
|
|
int result;
|
|
String a = A, b = B;
|
|
|
|
do {
|
|
VersionPart va = new VersionPart();
|
|
VersionPart vb = new VersionPart();
|
|
a = parseVersionPart(a, va);
|
|
b = parseVersionPart(b, vb);
|
|
|
|
result = compareVersionPart(va, vb);
|
|
if (result != 0) {
|
|
break;
|
|
}
|
|
} while (a != null || b != null);
|
|
|
|
return result;
|
|
}
|
|
|
|
private class VersionPart {
|
|
int numA = 0;
|
|
String strB;
|
|
int numC = 0;
|
|
String extraD;
|
|
}
|
|
|
|
private static String parseVersionPart(String aVersion, VersionPart result) {
|
|
if (aVersion == null || aVersion.length() == 0) {
|
|
return aVersion;
|
|
}
|
|
|
|
StringTokenizer tok = new StringTokenizer(aVersion.trim(), ".");
|
|
String part = tok.nextToken();
|
|
|
|
if (part.equals("*")) {
|
|
result.numA = Integer.MAX_VALUE;
|
|
result.strB = "";
|
|
} else {
|
|
VersionPartTokenizer vertok = new VersionPartTokenizer(part);
|
|
try {
|
|
result.numA = Integer.parseInt(vertok.nextToken());
|
|
} catch (NumberFormatException e) {
|
|
// parsing error; default to zero like 'strtol' C function
|
|
result.numA = 0;
|
|
}
|
|
|
|
if (vertok.hasMoreElements()) {
|
|
String str = vertok.nextToken();
|
|
|
|
// if part is of type "<num>+"
|
|
if (str.charAt(0) == '+') {
|
|
result.numA++;
|
|
result.strB = "pre";
|
|
} else {
|
|
// else if part is of type "<num><alpha>..."
|
|
result.strB = str;
|
|
|
|
if (vertok.hasMoreTokens()) {
|
|
try {
|
|
result.numC = Integer.parseInt(vertok.nextToken());
|
|
} catch (NumberFormatException e) {
|
|
// parsing error; default to zero like 'strtol' C function
|
|
result.numC = 0;
|
|
}
|
|
if (vertok.hasMoreTokens()) {
|
|
result.extraD = vertok.getRemainder();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (tok.hasMoreTokens()) {
|
|
// return everything after "."
|
|
return aVersion.substring(part.length() + 1);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private int compareVersionPart(VersionPart va, VersionPart vb) {
|
|
int res = compareInt(va.numA, vb.numA);
|
|
if (res != 0) {
|
|
return res;
|
|
}
|
|
|
|
res = compareString(va.strB, vb.strB);
|
|
if (res != 0) {
|
|
return res;
|
|
}
|
|
|
|
res = compareInt(va.numC, vb.numC);
|
|
if (res != 0) {
|
|
return res;
|
|
}
|
|
|
|
return compareString(va.extraD, vb.extraD);
|
|
}
|
|
|
|
private int compareInt(int n1, int n2) {
|
|
return n1 - n2;
|
|
}
|
|
|
|
private int compareString(String str1, String str2) {
|
|
// any string is *before* no string
|
|
if (str1 == null) {
|
|
return (str2 != null) ? 1 : 0;
|
|
}
|
|
|
|
if (str2 == null) {
|
|
return -1;
|
|
}
|
|
|
|
return str1.compareTo(str2);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Specialized tokenizer for Mozilla version strings. A token can
|
|
* consist of one of the four sections of a version string: <code>
|
|
* <number-a><string-b><number-c>
|
|
* <string-d (everything else)></code>.
|
|
*/
|
|
class VersionPartTokenizer implements Enumeration {
|
|
|
|
String part;
|
|
|
|
public VersionPartTokenizer(String aPart) {
|
|
part = aPart;
|
|
}
|
|
|
|
public boolean hasMoreElements() {
|
|
return part.length() != 0;
|
|
}
|
|
|
|
public boolean hasMoreTokens() {
|
|
return part.length() != 0;
|
|
}
|
|
|
|
public Object nextElement() {
|
|
if (part.matches("[\\+\\-]?[0-9].*")) {
|
|
// if string starts with a number...
|
|
int index = 0;
|
|
if (part.charAt(0) == '+' || part.charAt(0) == '-') {
|
|
index = 1;
|
|
}
|
|
|
|
while (index < part.length() && Character.isDigit(part.charAt(index))) {
|
|
index++;
|
|
}
|
|
|
|
String numPart = part.substring(0, index);
|
|
part = part.substring(index);
|
|
return numPart;
|
|
} else {
|
|
// ... or if this is the non-numeric part of version string
|
|
int index = 0;
|
|
while (index < part.length() && !Character.isDigit(part.charAt(index))) {
|
|
index++;
|
|
}
|
|
|
|
String alphaPart = part.substring(0, index);
|
|
part = part.substring(index);
|
|
return alphaPart;
|
|
}
|
|
}
|
|
|
|
public String nextToken() {
|
|
return (String) nextElement();
|
|
}
|
|
|
|
/**
|
|
* Returns what remains of the original string, without tokenization. This
|
|
* method is useful for getting the <code><string-d (everything else)>
|
|
* </code> section of a version string.
|
|
*
|
|
* @return remaining version string
|
|
*/
|
|
public String getRemainder() {
|
|
return part;
|
|
}
|
|
|
|
}
|
|
|