ar.com.ws.djnextension.config.GsonBuilderConfiguratorForTesting.java Source code

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Here is the source code for ar.com.ws.djnextension.config.GsonBuilderConfiguratorForTesting.java

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/*
 * Copyright  2008, 2009 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 ar.com.ws.djnextension.config;

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

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;

/**
 * @author Pedro Agullo Soliveres
 *
 */
public class GsonBuilderConfiguratorForTesting extends DefaultGsonBuilderConfigurator {

    /* (non-Javadoc)
     * @see com.softwarementors.extjs.djn.gson.DefaultGsonBuilderConfigurator#configure(com.google.gson.GsonBuilder, com.softwarementors.extjs.djn.config.GlobalConfiguration)
     */
    @Override
    public void configure(GsonBuilder builder, GlobalConfiguration configuration) {
        super.configure(builder, configuration);
        addCustomSerializationSupport(builder);
    }

    /**
     * @author eM3
     *
     */
    private static class JsonDateSerializer implements JsonSerializer<Date> {

        @SuppressWarnings("deprecation")
        // Unfortunately Date has many deprecated methods
        public JsonElement serialize(Date src, Type typeOfSrc, JsonSerializationContext context) {
            assert src != null;
            assert context != null;
            assert typeOfSrc != null;

            JsonObject result = new JsonObject();
            setIntValue(result, "year", src.getYear() + 1900);
            setIntValue(result, "month", src.getMonth() + 1);
            setIntValue(result, "day", src.getDate());

            return result;
        }
    }

    /**
     * @author eM3
     *
     */
    private static class JsonDateDeserializer implements JsonDeserializer<Date> {

        @SuppressWarnings("deprecation")
        // Unfortunately Date has many deprecated methods
        // @Override
        public Date 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 Date must be a JSON object");
            }

            JsonObject jsonObject = json.getAsJsonObject();
            int year = getIntValue(jsonObject, "year") - 1900;
            int month = getIntValue(jsonObject, "month") - 1;
            int day = getIntValue(jsonObject, "day");

            Date result = new Date(year, month, day);
            return result;
        }
    }

    /**
     * @param builder
     */
    private void addCustomSerializationSupport(GsonBuilder builder) {

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

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

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

    /**
     * @param parent
     * @param elementName
     * @return
     */
    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();
    }
}