uk.ac.horizon.aestheticodes.server.ExperienceParser.java Source code

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Here is the source code for uk.ac.horizon.aestheticodes.server.ExperienceParser.java

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/*
 * Aestheticodes recognises a different marker scheme that allows the
 * creation of aesthetically pleasing, even beautiful, codes.
 * Copyright (C) 2015  Aestheticodes
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package uk.ac.horizon.aestheticodes.server;

import com.google.appengine.repackaged.org.codehaus.jackson.annotate.JsonIgnore;
import com.google.gson.*;
import com.google.gson.reflect.TypeToken;
import uk.ac.horizon.aestheticodes.model.Marker;

import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

public class ExperienceParser {
    public static class MarkerMapAdapter
            implements JsonDeserializer<Map<String, Marker>>, JsonSerializer<Map<String, Marker>> {
        @Override
        public Map<String, Marker> deserialize(JsonElement json, Type unused, JsonDeserializationContext context)
                throws JsonParseException {
            if (!json.isJsonArray()) {
                throw new JsonParseException("Unexpected type: " + json.getClass().getSimpleName());
            }

            Map<String, Marker> result = new HashMap<String, Marker>();
            JsonArray array = json.getAsJsonArray();
            for (JsonElement element : array) {
                if (element.isJsonObject()) {
                    Marker marker = context.deserialize(element, Marker.class);
                    result.put(marker.getCode(), marker);
                } else {
                    throw new JsonParseException("some meaningful message");
                }
            }
            return result;
        }

        @Override
        public JsonElement serialize(Map<String, Marker> src, Type typeOfSrc, JsonSerializationContext context) {
            final JsonArray array = new JsonArray();
            for (Marker marker : src.values()) {
                array.add(context.serialize(marker));
            }
            return array;
        }
    }

    public static Gson createParser() {
        GsonBuilder build = new GsonBuilder();
        build.registerTypeAdapter(new TypeToken<Map<String, Marker>>() {
        }.getType(), new MarkerMapAdapter());
        build.addSerializationExclusionStrategy(new ExclusionStrategy() {
            @Override
            public boolean shouldSkipField(FieldAttributes f) {
                final JsonIgnore ignore = f.getAnnotation(JsonIgnore.class);
                return ignore != null;
            }

            @Override
            public boolean shouldSkipClass(Class<?> clazz) {
                return false;
            }
        });
        return build.create();
    }
}