001package ca.uhn.fhir.util;
002
003/*-
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2022 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 ca.uhn.fhir.i18n.Msg;
024import ca.uhn.fhir.model.api.IModelJson;
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;
035
036public class JsonUtil {
037
038        private static final ObjectMapper ourMapperPrettyPrint;
039        private static final ObjectMapper ourMapperNonPrettyPrint;
040
041        static {
042                ourMapperPrettyPrint = new ObjectMapper();
043                ourMapperPrettyPrint.setSerializationInclusion(JsonInclude.Include.NON_NULL);
044                ourMapperPrettyPrint.enable(SerializationFeature.INDENT_OUTPUT);
045
046                ourMapperNonPrettyPrint = new ObjectMapper();
047                ourMapperNonPrettyPrint.setSerializationInclusion(JsonInclude.Include.NON_NULL);
048                ourMapperNonPrettyPrint.disable(SerializationFeature.INDENT_OUTPUT);
049        }
050
051        /**
052         * Parse JSON
053         */
054        public static <T> T deserialize(@Nonnull String theInput, @Nonnull Class<T> theType) throws IOException {
055                return ourMapperPrettyPrint.readerFor(theType).readValue(theInput);
056        }
057
058        /**
059         * Encode JSON
060         */
061        public static String serialize(@Nonnull Object theInput) throws IOException {
062                return serialize(theInput, true);
063        }
064
065        /**
066         * Encode JSON
067         */
068        public static String serialize(@Nonnull Object theInput, boolean thePrettyPrint) throws IOException {
069                StringWriter sw = new StringWriter();
070                if (thePrettyPrint) {
071                        ourMapperPrettyPrint.writeValue(sw, theInput);
072                } else {
073                        ourMapperNonPrettyPrint.writeValue(sw, theInput);
074                }
075                return sw.toString();
076        }
077
078        /**
079         * Encode JSON
080         */
081        public static void serialize(@Nonnull Object theInput, @Nonnull Writer theWriter) throws IOException {
082                // Note: We append a string here rather than just having ourMapper write directly
083                // to the Writer because ourMapper seems to close the writer for some stupid
084                // reason.. There's probably a way of preventing that bit I'm not sure what that
085                // is and it's not a big deal here.
086                theWriter.append(serialize(theInput));
087        }
088
089        public static String serializeOrInvalidRequest(IModelJson theJson) {
090                try {
091                        return ourMapperNonPrettyPrint.writeValueAsString(theJson);
092                } catch (JsonProcessingException e) {
093                        throw new InvalidRequestException(Msg.code(1741) + "Failed to encode " + theJson.getClass(), e);
094                }
095        }
096}