001package org.hl7.fhir.r5.model;
002
003
004
005
006/*
007Copyright (c) 2011+, HL7, Inc.
008All rights reserved.
009
010Redistribution and use in source and binary forms, with or without modification, 
011are permitted provided that the following conditions are met:
012
013 * Redistributions of source code must retain the above copyright notice, this 
014   list of conditions and the following disclaimer.
015 * Redistributions in binary form must reproduce the above copyright notice, 
016   this list of conditions and the following disclaimer in the documentation 
017   and/or other materials provided with the distribution.
018 * Neither the name of HL7 nor the names of its contributors may be used to 
019   endorse or promote products derived from this software without specific 
020   prior written permission.
021
022THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
023ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
024WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
025IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
026INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
027NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
028PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
029WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
030ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
031POSSIBILITY OF SUCH DAMAGE.
032
033*/
034
035/**
036 * This class is created to help implementers deal with a change to 
037 * the API that was made between versions 0.81 and 0.9
038 * 
039 *  The change is the behaviour of the .getX() where the cardinality of 
040 *  x is 0..1 or 1..1. Before the change, these routines would return 
041 *  null if the object had not previously been assigned, and after the '
042 *  change, they will automatically create the object if it had not 
043 *  been assigned (unless the object is polymorphic, in which case, 
044 *  only the type specific getters create the object)
045 *  
046 *  When making the transition from the old style to the new style, 
047 *  the main change is that when testing for presence or abssense
048 *  of the element, instead of doing one of these two: 
049 *  
050 *    if (obj.getProperty() == null)
051 *    if (obj.getProperty() != null)
052 *    
053 *  you instead do 
054 *  
055 *    if (!obj.hasProperty())
056 *    if (obj.hasProperty())
057 *    
058 * or else one of these two:
059 *    
060 *    if (obj.getProperty().isEmpty())
061 *    if (!obj.getProperty().isEmpty())
062 * 
063 * The only way to sort this out is by finding all these things 
064 * in the code, and changing them. 
065 * 
066 * To help with that, you can set the status field of this class
067 * to change how this API behaves. Note: the status value is tied
068 * to the way that you program. The intent of this class is to 
069 * help make developers the transiition to status = 0. The old
070 * behaviour is status = 2. To make the transition, set the 
071 * status code to 1. This way, any time a .getX routine needs
072 * to automatically create an object, an exception will be 
073 * raised instead. The expected use of this is:
074 *   - set status = 1
075 *   - test your code (all paths) 
076 *   - when an exception happens, change the code to use .hasX() or .isEmpty()
077 *   - when all execution paths don't raise an exception, set status = 0
078 *   - start programming to the new style. 
079 * 
080 * You can set status = 2 and leave it like that, but this is not 
081 * compatible with the utilities and validation code, nor with the
082 * HAPI code. So everyone shoul make this transition
083 *  
084 * This is a difficult change to make to an API. Most users should engage with it
085 * as they migrate from DSTU1 to DSTU2, at the same time as they encounter 
086 * other changes. This change was made in order to align the two java reference 
087 * implementations on a common object model, which is an important outcome that
088 * justifies making this change to implementers (sorry for any pain caused)
089 *  
090 * @author Grahame
091 *
092 */
093public class Configuration {
094
095        private static int status = 0;
096          // 0: auto-create  
097          // 1: error
098          // 2: return null
099
100        private static boolean acceptInvalidEnums;
101        
102        public static boolean errorOnAutoCreate() {
103          return status == 1;
104  }
105
106
107        public static boolean doAutoCreate() {
108          return status == 0;
109  }
110
111
112        public static boolean isAcceptInvalidEnums() {
113                return acceptInvalidEnums;
114        }
115
116
117        public static void setAcceptInvalidEnums(boolean value) {
118                acceptInvalidEnums = value;
119        }
120
121        
122}