com.softwarementors.extjs.djn.test.config.GsonBuilderConfiguratorForTesting.java Source code

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Here is the source code for com.softwarementors.extjs.djn.test.config.GsonBuilderConfiguratorForTesting.java

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/*
 * Copyright  2008, 2012 Pedro Agull Soliveres.
 * 
 * This file is part of DirectJNgine.
 *
 * DirectJNgine is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License.
 *
 * Commercial use is permitted to the extent that the code/component(s)
 * do NOT become part of another Open Source or Commercially developed
 * licensed development library or toolkit without explicit permission.
 *
 * DirectJNgine 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * This software uses the ExtJs library (http://extjs.com), which is 
 * distributed under the GPL v3 license (see http://extjs.com/license).
 */

package com.softwarementors.extjs.djn.test.config;

import java.lang.reflect.Type;
import java.util.GregorianCalendar;

import com.google.gson.GsonBuilder;
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.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.softwarementors.extjs.djn.StringUtils;
import com.softwarementors.extjs.djn.config.GlobalConfiguration;
import com.softwarementors.extjs.djn.gson.DefaultGsonBuilderConfigurator;

public class GsonBuilderConfiguratorForTesting extends DefaultGsonBuilderConfigurator {

    @Override
    public void configure(GsonBuilder builder, GlobalConfiguration configuration) {
        super.configure(builder, configuration);

        addCustomSerializationSupport(builder);
    }

    private static class JsonGregorianCalendarSerializer implements JsonSerializer<GregorianCalendar> {
        public JsonElement serialize(GregorianCalendar src, Type typeOfSrc, JsonSerializationContext context) {
            assert src != null;
            assert context != null;
            assert typeOfSrc != null;

            System.out.println("zzz");

            JsonObject result = new JsonObject();
            setIntValue(result, "year", src.get(GregorianCalendar.YEAR)); // GregorianCalendar stores years as realYears - 1900
            setIntValue(result, "month", src.get(GregorianCalendar.MONTH) + 1); // GregorianCalendar stores month as realMonth-1 (first month is 0!)
            setIntValue(result, "day", src.get(GregorianCalendar.DAY_OF_MONTH));

            return result;
        }
    }

    private static class JsonGregorianCalendarDeserializer implements JsonDeserializer<GregorianCalendar> {
        // @Override
        public GregorianCalendar deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            assert json != null;
            assert context != null;
            assert typeOfT != null;

            if (!json.isJsonObject()) {
                throw new JsonParseException("A GregorianCalendar must be a JSON object");
            }

            JsonObject jsonObject = json.getAsJsonObject();
            int year = getIntValue(jsonObject, "year");
            int month = getIntValue(jsonObject, "month"); // GregorianCalendar stores month as realMonth-1 (first month is 0!)
            int day = getIntValue(jsonObject, "day");

            GregorianCalendar result = new GregorianCalendar(year, month - 1, day);
            return result;
        }
    }

    private static void addCustomSerializationSupport(GsonBuilder builder) {
        // Convert our own custom javascript "date" to a Java GregorianCalendar
        builder.registerTypeAdapter(GregorianCalendar.class, new JsonGregorianCalendarSerializer());

        // Convert a Java GregorianCalendar to our own custom javascript "date" 
        builder.registerTypeAdapter(GregorianCalendar.class, new JsonGregorianCalendarDeserializer());
    }

    private static void setIntValue(JsonObject parent, String elementName, int value) {
        parent.add(elementName, new JsonPrimitive(Integer.valueOf(value)));
    }

    private static int getIntValue(JsonObject parent, String elementName) {
        assert parent != null;
        assert !StringUtils.isEmpty(elementName);

        JsonElement element = parent.get(elementName);
        if (!element.isJsonPrimitive()) {
            throw new JsonParseException("Element + '" + elementName + "' must be a valid integer");
        }
        JsonPrimitive primitiveElement = (JsonPrimitive) element;
        if (!primitiveElement.isNumber()) {
            throw new JsonParseException("Element + '" + elementName + "' must be a valid integer");
        }
        return primitiveElement.getAsInt();
    }
}