001    /**
002     * Copyright 2010-2013 The Kuali Foundation
003     *
004     * Licensed under the Educational Community License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.opensource.org/licenses/ecl2.php
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package org.kuali.common.util;
017    
018    public class LongCounter {
019    
020            long count;
021    
022            public LongCounter() {
023                    this(0);
024            }
025    
026            public LongCounter(long startValue) {
027                    super();
028                    this.count = startValue;
029            }
030    
031            public synchronized long increment() {
032                    Assert.isFalse(count == Long.MAX_VALUE, "max counter value exceeded");
033                    return count++;
034            }
035    
036            public synchronized long decrement() {
037                    Assert.isFalse(count == Long.MIN_VALUE, "min counter value exceeded");
038                    return count--;
039            }
040    
041            public synchronized long getValue() {
042                    return count;
043            }
044    }