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package org.apache.qpid.util;
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
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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