001package org.hl7.fhir.r4.model;
002
003/*
004Copyright (c) 2011+, HL7, Inc.
005All rights reserved.
006
007Redistribution and use in source and binary forms, with or without modification, 
008are permitted provided that the following conditions are met:
009
010 * Redistributions of source code must retain the above copyright notice, this 
011   list of conditions and the following disclaimer.
012 * Redistributions in binary form must reproduce the above copyright notice, 
013   this list of conditions and the following disclaimer in the documentation 
014   and/or other materials provided with the distribution.
015 * Neither the name of HL7 nor the names of its contributors may be used to 
016   endorse or promote products derived from this software without specific 
017   prior written permission.
018
019THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
020ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
021WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
022IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
023INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
024NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
025PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
026WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
027ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
028POSSIBILITY OF SUCH DAMAGE.
029
030*/
031
032/**
033 * This class is created to help implementers deal with a change to the API that
034 * was made between versions 0.81 and 0.9
035 * 
036 * The change is the behaviour of the .getX() where the cardinality of x is 0..1
037 * or 1..1. Before the change, these routines would return null if the object
038 * had not previously been assigned, and after the ' change, they will
039 * automatically create the object if it had not been assigned (unless the
040 * object is polymorphic, in which case, only the type specific getters create
041 * the object)
042 * 
043 * When making the transition from the old style to the new style, the main
044 * change is that when testing for presence or abssense of the element, instead
045 * of doing one of these two:
046 * 
047 * if (obj.getProperty() == null) if (obj.getProperty() != null)
048 * 
049 * you instead do
050 * 
051 * if (!obj.hasProperty()) if (obj.hasProperty())
052 * 
053 * or else one of these two:
054 * 
055 * if (obj.getProperty().isEmpty()) if (!obj.getProperty().isEmpty())
056 * 
057 * The only way to sort this out is by finding all these things in the code, and
058 * changing them.
059 * 
060 * To help with that, you can set the status field of this class to change how
061 * this API behaves. Note: the status value is tied to the way that you program.
062 * The intent of this class is to help make developers the transiition to status
063 * = 0. The old behaviour is status = 2. To make the transition, set the status
064 * code to 1. This way, any time a .getX routine needs to automatically create
065 * an object, an exception will be raised instead. The expected use of this is:
066 * - set status = 1 - test your code (all paths) - when an exception happens,
067 * change the code to use .hasX() or .isEmpty() - when all execution paths don't
068 * raise an exception, set status = 0 - start programming to the new style.
069 * 
070 * You can set status = 2 and leave it like that, but this is not compatible
071 * with the utilities and validation code, nor with the HAPI code. So everyone
072 * shoul make this transition
073 * 
074 * This is a difficult change to make to an API. Most users should engage with
075 * it as they migrate from DSTU1 to DSTU2, at the same time as they encounter
076 * other changes. This change was made in order to align the two java reference
077 * implementations on a common object model, which is an important outcome that
078 * justifies making this change to implementers (sorry for any pain caused)
079 * 
080 * @author Grahame
081 *
082 */
083public class Configuration {
084
085  private static int status = 0;
086  // 0: auto-create
087  // 1: error
088  // 2: return null
089
090  private static boolean acceptInvalidEnums;
091
092  public static boolean errorOnAutoCreate() {
093    return status == 1;
094  }
095
096  public static boolean doAutoCreate() {
097    return status == 0;
098  }
099
100  public static boolean isAcceptInvalidEnums() {
101    return acceptInvalidEnums;
102  }
103
104  public static void setAcceptInvalidEnums(boolean value) {
105    acceptInvalidEnums = value;
106  }
107
108}