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//
// ========================================================================
// Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.start;
/**
* Utility class for parsing and comparing version strings.
* JDK 1.1 compatible.
*
*/
public class Version {
int _version = 0;
int _revision = 0;
int _subrevision = 0;
String _suffix = "";
public Version() {
}
public Version(String version_string) {
parse(version_string);
}
/**
* parses version string in the form version[.revision[.subrevision[extension]]]
* into this instance.
*/
public void parse(String version_string) {
_version = 0;
_revision = 0;
_subrevision = 0;
_suffix = "";
int pos = 0;
int startpos = 0;
int endpos = version_string.length();
while ( (pos < endpos) && Character.isDigit(version_string.charAt(pos))) {
pos++;
}
_version = Integer.parseInt(version_string.substring(startpos,pos));
if ((pos < endpos) && version_string.charAt(pos)=='.') {
startpos = ++pos;
while ( (pos < endpos) && Character.isDigit(version_string.charAt(pos))) {
pos++;
}
_revision = Integer.parseInt(version_string.substring(startpos,pos));
}
if ((pos < endpos) && version_string.charAt(pos)=='.') {
startpos = ++pos;
while ( (pos < endpos) && Character.isDigit(version_string.charAt(pos))) {
pos++;
}
_subrevision = Integer.parseInt(version_string.substring(startpos,pos));
}
if (pos < endpos) {
_suffix = version_string.substring(pos);
}
}
/**
* @return string representation of this version
*/
public String toString() {
StringBuffer sb = new StringBuffer(10);
sb.append(_version);
sb.append('.');
sb.append(_revision);
sb.append('.');
sb.append(_subrevision);
sb.append(_suffix);
return sb.toString();
}
// java.lang.Comparable is Java 1.2! Cannot use it
/**
* Compares with other version. Does not take extension into account,
* as there is no reliable way to order them.
* @return -1 if this is older version that other,
* 0 if its same version,
* 1 if it's newer version than other
*/
public int compare(Version other) {
if (other == null) throw new NullPointerException("other version is null");
if (this._version < other._version) return -1;
if (this._version > other._version) return 1;
if (this._revision < other._revision) return -1;
if (this._revision > other._revision) return 1;
if (this._subrevision < other._subrevision) return -1;
if (this._subrevision > other._subrevision) return 1;
return 0;
}
/**
* Check whether this verion is in range of versions specified
*/
public boolean isInRange(Version low, Version high) {
return (compare(low)>=0 && compare(high)<=0);
}
}
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