uk.org.openeyes.oink.domain.json.ResourceGsonAdapter.java Source code

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Here is the source code for uk.org.openeyes.oink.domain.json.ResourceGsonAdapter.java

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/*******************************************************************************
 * OINK - Copyright (c) 2014 OpenEyes Foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package uk.org.openeyes.oink.domain.json;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.hl7.fhir.instance.formats.JsonComposer;
import org.hl7.fhir.instance.formats.JsonParser;
import org.hl7.fhir.instance.formats.ParserBase.ResourceOrFeed;
import org.hl7.fhir.instance.model.Resource;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

public class ResourceGsonAdapter implements JsonSerializer<Resource>, JsonDeserializer<Resource> {

    @Override
    public Resource deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {

        JsonParser parser = new JsonParser();
        String jsonString = json.toString();
        InputStream is = new ByteArrayInputStream(jsonString.getBytes());
        try {
            ResourceOrFeed resourceOrFeed = parser.parseGeneral(is);
            return resourceOrFeed.getResource();
        } catch (Exception e) {
            throw new JsonParseException("Invalid Resource structure: " + e.getMessage());
        } finally {
            try {
                is.close();
            } catch (IOException e) {
            }
        }
    }

    @Override
    public JsonElement serialize(Resource src, Type typeOfSrc, JsonSerializationContext context) {
        JsonComposer composer = new JsonComposer();
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            composer.compose(os, src, false);
            String element = os.toString();

            // Bug - Fhir Java Implementation serializes empty strings as NULL
            //element = element.replaceAll("null", "\"\"");

            JsonObject ob = new JsonObject();
            com.google.gson.JsonParser gsonParser = new com.google.gson.JsonParser();
            return gsonParser.parse(element);
        } catch (Exception e) {
            return null;
        }
    }

}