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package hudson.util;
import java.util.StringTokenizer;
/**
* Immutable representation of a dot or '-'-separated digits (such as "1.0.1" or "1.0-52").
*
* {@link VersionNumber}s are {@link Comparable}.
*
* <h2>Special tokens</h2>
* <p>
* We allow a component to be not just a number, but also "ea", "ea1", "ea2".
* "ea" is treated as "ea0", and eaN < M for any M > 0.
*
* <p>
* '*' is also allowed as a component, and '*' > M for any M > 0.
*
* <p>
* 'SNAPSHOT' is also allowed as a component, and "N.SNAPSHOT" is interpreted as "N-1.*"
*
* <pre>
* 2.0.* > 2.0.1 > 2.0.1-SNAPSHOT > 2.0.0.99 > 2.0.0 > 2.0.ea > 2.0
* </pre>
*
* @author
* Kohsuke Kawaguchi (kohsuke.kawaguchi@sun.com)
* @since 1.139
*/
public class VersionNumber implements Comparable<VersionNumber> {
private final int[] digits;
/**
* Parses a string like "1.0.2" into the version number.
*
* @throws IllegalArgumentException
* if the parsing fails.
*/
public VersionNumber( String num ) {
StringTokenizer tokens = new StringTokenizer(num,".-_");
digits = new int[tokens.countTokens()];
if(digits.length<2)
throw new IllegalArgumentException("Failed to parse "+num+" as version number");
int i=0;
while( tokens.hasMoreTokens() ) {
String token = tokens.nextToken().toLowerCase();
if(token.equals("*")) {
digits[i++] = 1000;
} else
if(token.startsWith("snapshot")) {
digits[i-1]--;
digits[i++] = 1000;
break;
} else
if(token.startsWith("ea")) {
if(token.length()==2)
digits[i++] = -1000; // just "ea"
else
digits[i++] = -1000 + Integer.parseInt(token.substring(2)); // "eaNNN"
} else {
int n =0;
try {
n = Integer.parseInt(token);
} catch (NumberFormatException e) {
// ignore
}
digits[i++] = n;
}
}
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
for( int i=0; i<digits.length; i++ ) {
if(i!=0) buf.append('.');
buf.append( Integer.toString(digits[i]) );
}
return buf.toString();
}
public boolean isOlderThan( VersionNumber rhs ) {
return compareTo(rhs)<0;
}
public boolean isNewerThan( VersionNumber rhs ) {
return compareTo(rhs)>0;
}
public int digit(int idx) {
return digits[idx];
}
@Override
public boolean equals( Object o ) {
if (!(o instanceof VersionNumber)) return false;
return compareTo((VersionNumber)o)==0;
}
@Override
public int hashCode() {
int x=0;
for (int i : digits)
x = (x << 1) | i;
return x;
}
public int compareTo(VersionNumber rhs) {
for( int i=0; ; i++ ) {
if( i==this.digits.length && i==rhs.digits.length )
return 0; // equals
if( i==this.digits.length )
return -1; // rhs is larger
if( i==rhs.digits.length )
return 1;
int r = this.digits[i] - rhs.digits[i];
if(r!=0) return r;
}
}
}