| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| LongGenerator |
|
| 1.75;1.75 |
| 1 | /* | |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
| 3 | * contributor license agreements. See the NOTICE file distributed with | |
| 4 | * this work for additional information regarding copyright ownership. | |
| 5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| 6 | * (the "License"); you may not use this file except in compliance with | |
| 7 | * the License. You may obtain a copy of the License at | |
| 8 | * | |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 | * | |
| 11 | * Unless required by applicable law or agreed to in writing, software | |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 | * See the License for the specific language governing permissions and | |
| 15 | * limitations under the License. | |
| 16 | */ | |
| 17 | ||
| 18 | package org.apache.commons.id.serial; | |
| 19 | ||
| 20 | import org.apache.commons.id.AbstractLongIdentifierGenerator; | |
| 21 | ||
| 22 | import java.io.Serializable; | |
| 23 | ||
| 24 | /** | |
| 25 | * <code>LongGenerator</code> is an Identifier Generator | |
| 26 | * that generates an incrementing number as a Long object. | |
| 27 | * | |
| 28 | * <p>If the <code>wrap</code> argument passed to the constructor is set to | |
| 29 | * <code>true</code>, the sequence will wrap, returning negative values when | |
| 30 | * {@link Long#MAX_VALUE} reached; otherwise an {@link IllegalStateException} | |
| 31 | * will be thrown.</p> | |
| 32 | * | |
| 33 | * @author Commons-Id team | |
| 34 | * @version $Id: LongGenerator.java 480488 2006-11-29 08:57:26Z bayard $ | |
| 35 | */ | |
| 36 | public class LongGenerator extends AbstractLongIdentifierGenerator implements Serializable { | |
| 37 | ||
| 38 | /** | |
| 39 | * <code>serialVersionUID</code> is the serializable UID for the binary version of the class. | |
| 40 | */ | |
| 41 | private static final long serialVersionUID = 20060122L; | |
| 42 | ||
| 43 | /** Should the counter wrap. */ | |
| 44 | private boolean wrapping; | |
| 45 | /** The counter. */ | |
| 46 | 9 | private long count = 0; |
| 47 | ||
| 48 | /** | |
| 49 | * Constructor. | |
| 50 | * | |
| 51 | * @param wrap should the factory wrap when it reaches the maximum | |
| 52 | * long value (or throw an exception) | |
| 53 | * @param initialValue the initial long value to start at | |
| 54 | */ | |
| 55 | public LongGenerator(boolean wrap, long initialValue) { | |
| 56 | 9 | super(); |
| 57 | 9 | this.wrapping = wrap; |
| 58 | 9 | this.count = initialValue; |
| 59 | 9 | } |
| 60 | ||
| 61 | /** | |
| 62 | * Getter for property wrap. | |
| 63 | * | |
| 64 | * @return <code>true</code> if this generator is set up to wrap. | |
| 65 | * | |
| 66 | */ | |
| 67 | public boolean isWrap() { | |
| 68 | 4 | return wrapping; |
| 69 | } | |
| 70 | ||
| 71 | /** | |
| 72 | * Sets the wrap property. | |
| 73 | * | |
| 74 | * @param wrap value for the wrap property | |
| 75 | * | |
| 76 | */ | |
| 77 | public void setWrap(boolean wrap) { | |
| 78 | 0 | this.wrapping = wrap; |
| 79 | 0 | } |
| 80 | ||
| 81 | public Long nextLongIdentifier() { | |
| 82 | 19 | long value = 0; |
| 83 | 19 | if (wrapping) { |
| 84 | 14 | synchronized (this) { |
| 85 | 14 | value = count++; |
| 86 | 14 | } |
| 87 | 14 | } else { |
| 88 | 5 | synchronized (this) { |
| 89 | 5 | if (count == Long.MAX_VALUE) { |
| 90 | 3 | throw new IllegalStateException |
| 91 | ("The maximum number of identifiers has been reached"); | |
| 92 | } | |
| 93 | 2 | value = count++; |
| 94 | 2 | } |
| 95 | } | |
| 96 | 16 | return new Long(value); |
| 97 | } | |
| 98 | } |