001/** 002The contents of this file are subject to the Mozilla Public License Version 1.1 003(the "License"); you may not use this file except in compliance with the License. 004You may obtain a copy of the License at http://www.mozilla.org/MPL/ 005Software distributed under the License is distributed on an "AS IS" basis, 006WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the 007specific language governing rights and limitations under the License. 008 009The Original Code is "DelegatingHiLoGenerator.java". Description: 010"Generator that delegates generation of hi IDs " 011 012The Initial Developer of the Original Code is University Health Network. Copyright (C) 0132001. All Rights Reserved. 014 015Contributor(s): ______________________________________. 016 017Alternatively, the contents of this file may be used under the terms of the 018GNU General Public License (the "GPL"), in which case the provisions of the GPL are 019applicable instead of those above. If you wish to allow use of your version of this 020file only under the terms of the GPL and not to allow others to use your version 021of this file under the MPL, indicate your decision by deleting the provisions above 022and replace them with the notice and other provisions required by the GPL License. 023If you do not delete the provisions above, a recipient may use your version of 024this file under either the MPL or the GPL. 025 */ 026package ca.uhn.hl7v2.util.idgenerator; 027 028import java.io.IOException; 029 030/** 031 * Default implementation of a HiLo ID generator that allows to use another 032 * (non-HiLo) ID generator for generating the "hi" part of the ID. The delegate 033 * must increment its ID is discrete steps > 1, so that the gaps can be filled 034 * with "lo" IDs. 035 * <p> 036 * Example: 037 * </p> 038 * <pre> 039 * Hi IDs: 0, 100, 200, 300 (increment = 100) 040 * Lo IDs: 1,2,3,...,100,1,2,3,.... 041 * Resulting ID (Hi + Lo): 1,2,3,99,100,101,102,... 042 * </pre> 043 * 044 * @see FileBasedHiLoGenerator 045 * @author Christian Ohr 046 */ 047public class DelegatingHiLoGenerator extends HiLoGenerator { 048 049 private IDGenerator.Ordered delegate; 050 051 public DelegatingHiLoGenerator() { 052 super(); 053 } 054 055 public DelegatingHiLoGenerator(IDGenerator.Ordered delegate) { 056 super(); 057 this.delegate = delegate; 058 } 059 060 @Override 061 protected long getNextHiId() throws IOException { 062 if (delegate == null) 063 throw new NullPointerException( 064 "Must initialize delegate IDGenerator"); 065 return Long.parseLong(delegate.getID()); 066 } 067 068 public void setDelegate(IDGenerator.Ordered delegate) { 069 this.delegate = delegate; 070 } 071 072 @Override 073 protected void resetHiId() { 074 delegate.reset(); 075 } 076 077 /** 078 * THe maximum "lo" ID is the increment of the hi ID. 079 * @return 080 */ 081 @Override 082 public long getMaxLo() { 083 return delegate.getIncrement(); 084 } 085 086}