001package ca.uhn.fhir.util;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2017 University Health Network
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.HashSet;
024import java.util.List;
025import java.util.Set;
026
027import org.hl7.fhir.instance.model.api.IPrimitiveType;
028
029import ca.uhn.fhir.model.primitive.StringDt;
030
031public class DatatypeUtil {
032
033        /**
034         * Convert a list of FHIR String objects to a set of native java Strings
035         */
036        public static Set<String> toStringSet(List<StringDt> theStringList) {
037                HashSet<String> retVal = new HashSet<String>();
038                if (theStringList != null) {
039                        for (StringDt string : theStringList) {
040                                if (string != null && string.getValue()!=null) {
041                                        retVal.add(string.getValue());
042                                }
043                        }
044                }
045                return retVal;
046        }
047
048        /**
049         * Joins a list of strings with a single space (' ') between each string 
050         */
051        public static String joinStringsSpaceSeparated(List<? extends IPrimitiveType<String>> theStrings) {
052                StringBuilder b = new StringBuilder();
053                for (IPrimitiveType<String> next : theStrings) {
054                        if (next.isEmpty()) {
055                                continue;
056                        }
057                        if (b.length() > 0) {
058                                b.append(' ');
059                        }
060                        b.append(next.getValue());
061                }
062                return b.toString();
063        }
064
065}