| /* |
| * |
| * 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. |
| * |
| */ |
| package org.apache.qpid.server.util; |
| |
| |
| import java.util.Comparator; |
| |
| /** |
| * This class provides basic serial number comparisons as defined in |
| * RFC 1982. |
| */ |
| |
| public class Serial |
| { |
| private Serial() |
| { |
| } |
| |
| public static final Comparator<Integer> COMPARATOR = new Comparator<Integer>() |
| { |
| @Override |
| 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; |
| } |
| } |
| |
| } |