com.softwarementors.extjs.djn.gson.DefaultGsonBuilderConfigurator.java Source code

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Here is the source code for com.softwarementors.extjs.djn.gson.DefaultGsonBuilderConfigurator.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.gson;

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.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;
import com.softwarementors.extjs.djn.config.GlobalConfiguration;

public class DefaultGsonBuilderConfigurator implements GsonBuilderConfigurator {

    private static class DateDeserializer implements JsonDeserializer<Date> {
        public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
                throws JsonParseException {
            assert json != null;
            assert context != null;
            assert typeOfT != null;

            if (!json.isJsonPrimitive()) {
                throw new JsonParseException("The value for a Date must be a valid number");
            }

            assert json instanceof JsonPrimitive; // To please Findugs!
            JsonPrimitive primitivejson = (JsonPrimitive) json;
            if (!primitivejson.isNumber()) {
                throw new JsonParseException("The value for a Date must be a valid number");
            }
            return new Date(primitivejson.getAsLong());
        }
    }

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

            JsonElement result = new JsonPrimitive(Long.valueOf(src.getTime()));
            return result;
        }
    }

    public void configure(GsonBuilder builder, GlobalConfiguration configuration) {
        assert builder != null;
        assert configuration != null;

        if (configuration.getDebug()) {
            builder.setPrettyPrinting();
        }
        builder.serializeNulls();
        builder.disableHtmlEscaping();

        builder.registerTypeAdapter(Date.class, new DateDeserializer());
        builder.registerTypeAdapter(Date.class, new DateSerializer());
    }

}