001package ca.uhn.fhir.util;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2021 Smile CDR, Inc.
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import java.util.ArrayList;
024import java.util.List;
025
026import org.hl7.fhir.instance.model.api.IBase;
027
028import ca.uhn.fhir.model.api.ICompositeElement;
029import ca.uhn.fhir.model.api.IElement;
030
031public class ElementUtil {
032
033        @SuppressWarnings("unchecked")
034        public static boolean isEmpty(Object... theElements) {
035                if (theElements == null) {
036                        return true;
037                }
038                for (int i = 0; i < theElements.length; i++) {
039                        Object next = theElements[i];
040                        if (next instanceof List) {
041                                if (!isEmpty((List<? extends IBase>) next)) {
042                                        return false;
043                                }
044                        } else if (next instanceof String && (!((String)next).isEmpty())) {
045                                return false;
046                        } else if (next != null && !((IBase) next).isEmpty()) {
047                                return false;
048                        }
049                }
050                return true;
051        }
052
053        public static boolean isEmpty(IBase... theElements) {
054                if (theElements == null) {
055                        return true;
056                }
057                for (int i = 0; i < theElements.length; i++) {
058                        IBase next = theElements[i];
059                        if (next != null && !next.isEmpty()) {
060                                return false;
061                        }
062                }
063                return true;
064        }
065
066        public static boolean isEmpty(IElement... theElements) {
067                if (theElements == null) {
068                        return true;
069                }
070                for (int i = 0; i < theElements.length; i++) {
071                        IBase next = theElements[i];
072                        if (next != null && !next.isEmpty()) {
073                                return false;
074                        }
075                }
076                return true;
077        }
078
079        public static boolean isEmpty(List<? extends IBase> theElements) {
080                if (theElements == null) {
081                        return true;
082                }
083                for (int i = 0; i < theElements.size(); i++) {
084                        IBase next;
085                        try {
086                                next = theElements.get(i);
087                        } catch (ClassCastException e) {
088                                List<?> elements = theElements;
089                                String s = "Found instance of " + elements.get(i).getClass() + " - Did you set a field value to the incorrect type? Expected " + IBase.class.getName();
090                                throw new ClassCastException(s);
091                        }
092                        if (next != null && !next.isEmpty()) {
093                                return false;
094                        }
095                }
096                return true;
097        }
098
099        /**
100         * Note that this method does not work on HL7.org structures
101         */
102        public static <T extends IElement> List<T> allPopulatedChildElements(Class<T> theType, Object... theElements) {
103                ArrayList<T> retVal = new ArrayList<T>();
104                for (Object next : theElements) {
105                        if (next == null) {
106                                continue;
107                        }else if (next instanceof IElement) {
108                                addElement(retVal, (IElement) next, theType);
109                        } else if (next instanceof List) {
110                                for (Object nextElement : ((List<?>)next)) {
111                                        if (!(nextElement instanceof IBase)) {
112                                                throw new IllegalArgumentException("Found element of "+nextElement.getClass());
113                                        }
114                                        addElement(retVal, (IElement) nextElement, theType);
115                                }
116                        } else {
117                                throw new IllegalArgumentException("Found element of "+next.getClass());
118                        }
119                        
120                }
121                return retVal;
122        }
123
124        //@SuppressWarnings("unchecked")
125        private static <T extends IElement> void addElement(ArrayList<T> retVal, IElement next, Class<T> theType) {
126                if (theType != null && theType.isAssignableFrom(next.getClass())) {
127                        retVal.add(theType.cast(next));
128                }
129                if (next instanceof ICompositeElement) {
130                        ICompositeElement iCompositeElement = (ICompositeElement) next;
131                        //TODO: Use of a deprecated method should be resolved.
132                        retVal.addAll(iCompositeElement.getAllPopulatedChildElementsOfType(theType));
133                }
134        }
135        
136}