001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.activemq.store.kahadb.disk.util; 018 019/** 020 * Represents a range of numbers. 021 * 022 * @author chirino 023 */ 024public class Sequence extends LinkedNode<Sequence> { 025 long first; 026 long last; 027 028 public Sequence(long value) { 029 first = last = value; 030 } 031 032 public Sequence(long first, long last) { 033 this.first = first; 034 this.last = last; 035 } 036 037 public boolean isAdjacentToLast(long value) { 038 return last + 1 == value; 039 } 040 041 public boolean isBiggerButNotAdjacentToLast(long value) { 042 return last + 1 < value; 043 } 044 045 public boolean isAdjacentToFirst(long value) { 046 return first - 1 == value; 047 } 048 049 public boolean contains(long value) { 050 return first <= value && value <= last; 051 } 052 053 public long range() { 054 return first == last ? 1 : (last - first) + 1; 055 } 056 057 @Override 058 public String toString() { 059 return first == last ? "" + first : first + ".." + last; 060 } 061 062 public long getFirst() { 063 return first; 064 } 065 066 public void setFirst(long first) { 067 this.first = first; 068 } 069 070 public long getLast() { 071 return last; 072 } 073 074 public void setLast(long last) { 075 this.last = last; 076 } 077 078 public interface Closure<T extends Throwable> { 079 public void execute(long value) throws T; 080 } 081 082 public <T extends Throwable> void each(Closure<T> closure) throws T { 083 for( long i=first; i<=last; i++ ) { 084 closure.execute(i); 085 } 086 } 087 088}