001package ca.uhn.fhir.util;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2023 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 org.hl7.fhir.instance.model.api.IPrimitiveType;
024
025import java.util.HashSet;
026import java.util.List;
027import java.util.Set;
028
029public class DatatypeUtil {
030
031        /**
032         * Convert a list of FHIR String objects to a set of native java Strings
033         */
034        public static Set<String> toStringSet(List<? extends IPrimitiveType<?>> theStringList) {
035                HashSet<String> retVal = new HashSet<>();
036                if (theStringList != null) {
037                        for (IPrimitiveType<?> string : theStringList) {
038                                if (string != null && string.getValue() != null) {
039                                        retVal.add(string.getValueAsString());
040                                }
041                        }
042                }
043                return retVal;
044        }
045
046        /**
047         * Joins a list of strings with a single space (' ') between each string
048         */
049        public static String joinStringsSpaceSeparated(List<? extends IPrimitiveType<String>> theStrings) {
050                StringBuilder b = new StringBuilder();
051                for (IPrimitiveType<String> next : theStrings) {
052                        if (next.isEmpty()) {
053                                continue;
054                        }
055                        if (b.length() > 0) {
056                                b.append(' ');
057                        }
058                        b.append(next.getValue());
059                }
060                return b.toString();
061        }
062
063        /**
064         * Returns {@link IPrimitiveType#getValueAsString()} if <code>thePrimitiveType</code> is
065         * not null, else returns null.
066         */
067        public static String toStringValue(IPrimitiveType<?> thePrimitiveType) {
068                return thePrimitiveType != null ? thePrimitiveType.getValueAsString() : null;
069        }
070
071        /**
072         * Returns {@link IPrimitiveType#getValue()} if <code>thePrimitiveType</code> is
073         * not null, else returns null.
074         */
075        public static Boolean toBooleanValue(IPrimitiveType<Boolean> thePrimitiveType) {
076                return thePrimitiveType != null ? thePrimitiveType.getValue() : null;
077        }
078}