001/*-
002 * #%L
003 * HAPI FHIR - Core Library
004 * %%
005 * Copyright (C) 2014 - 2023 Smile CDR, Inc.
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 *
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package ca.uhn.fhir.util;
021
022import ca.uhn.fhir.i18n.Msg;
023import ca.uhn.fhir.model.api.IModelJson;
024import ca.uhn.fhir.rest.server.exceptions.InternalErrorException;
025import ca.uhn.fhir.rest.server.exceptions.InvalidRequestException;
026import com.fasterxml.jackson.annotation.JsonInclude;
027import com.fasterxml.jackson.core.JsonProcessingException;
028import com.fasterxml.jackson.databind.ObjectMapper;
029import com.fasterxml.jackson.databind.SerializationFeature;
030
031import javax.annotation.Nonnull;
032import java.io.IOException;
033import java.io.StringWriter;
034import java.io.Writer;
035import java.util.List;
036
037public class JsonUtil {
038
039        private static final ObjectMapper ourMapperPrettyPrint;
040        private static final ObjectMapper ourMapperNonPrettyPrint;
041
042        static {
043                ourMapperPrettyPrint = new ObjectMapper();
044                ourMapperPrettyPrint.setSerializationInclusion(JsonInclude.Include.NON_NULL);
045                ourMapperPrettyPrint.enable(SerializationFeature.INDENT_OUTPUT);
046
047                ourMapperNonPrettyPrint = new ObjectMapper();
048                ourMapperNonPrettyPrint.setSerializationInclusion(JsonInclude.Include.NON_NULL);
049                ourMapperNonPrettyPrint.disable(SerializationFeature.INDENT_OUTPUT);
050        }
051
052        /**
053         * Parse JSON
054         */
055        public static <T> T deserialize(@Nonnull String theInput, @Nonnull Class<T> theType) {
056                try {
057                        return ourMapperPrettyPrint.readerFor(theType).readValue(theInput);
058                } catch (IOException e) {
059                        // Should not happen
060                        throw new InternalErrorException(Msg.code(2060) + e);
061                }
062        }
063
064        /**
065         * Parse JSON
066         */
067        public static <T> List<T> deserializeList(@Nonnull String theInput, @Nonnull Class<T> theType) throws IOException {
068                return ourMapperPrettyPrint.readerForListOf(theType).readValue(theInput);
069        }
070
071        /**
072         * Encode JSON
073         */
074        public static String serialize(@Nonnull Object theInput) {
075                return serialize(theInput, true);
076        }
077
078        /**
079         * Encode JSON
080         */
081        public static String serialize(@Nonnull Object theInput, boolean thePrettyPrint) {
082                try {
083                        StringWriter sw = new StringWriter();
084                        if (thePrettyPrint) {
085                                ourMapperPrettyPrint.writeValue(sw, theInput);
086                        } else {
087                                ourMapperNonPrettyPrint.writeValue(sw, theInput);
088                        }
089                        return sw.toString();
090                } catch (IOException e) {
091                        // Should not happen
092                        throw new InternalErrorException(Msg.code(2061) + e);
093                }
094        }
095
096        /**
097         * Encode JSON
098         */
099        public static void serialize(@Nonnull Object theInput, @Nonnull Writer theWriter) throws IOException {
100                // Note: We append a string here rather than just having ourMapper write directly
101                // to the Writer because ourMapper seems to close the writer for some stupid
102                // reason.. There's probably a way of preventing that bit I'm not sure what that
103                // is and it's not a big deal here.
104                theWriter.append(serialize(theInput));
105        }
106
107        public static String serializeOrInvalidRequest(IModelJson theJson) {
108                try {
109                        return ourMapperNonPrettyPrint.writeValueAsString(theJson);
110                } catch (JsonProcessingException e) {
111                        throw new InvalidRequestException(Msg.code(1741) + "Failed to encode " + theJson.getClass(), e);
112                }
113        }
114}