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