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package org.apache.qpid.util;
import java.util.Comparator;
import org.apache.qpid.SerialException;
/**
* This class provides basic serial number comparisons as defined in
* RFC 1982.
*/
public class Serial
{
public static final Comparator<Integer> COMPARATOR = new Comparator<Integer>()
{
public int compare(Integer s1, Integer s2)
{
return Serial.compare(s1, s2);
}
};
/**
* Compares two numbers using serial arithmetic.
*
* @param s1 the first serial number
* @param s2 the second serial number
*
* @return a negative integer, zero, or a positive integer as the
* first argument is less than, equal to, or greater than the
* second
*/
public static final int compare(int s1, int s2)
{
return s1 - s2;
}
public static final boolean lt(int s1, int s2)
{
return compare(s1, s2) < 0;
}
public static final boolean le(int s1, int s2)
{
return compare(s1, s2) <= 0;
}
public static final boolean gt(int s1, int s2)
{
return compare(s1, s2) > 0;
}
public static final boolean ge(int s1, int s2)
{
return compare(s1, s2) >= 0;
}
public static final boolean eq(int s1, int s2)
{
return s1 == s2;
}
public static final int min(int s1, int s2)
{
if (lt(s1, s2))
{
return s1;
}
else
{
return s2;
}
}
public static final int max(int s1, int s2)
{
if (gt(s1, s2))
{
return s1;
}
else
{
return s2;
}
}
}
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