/*******************************************************************************
 * Copyright (c) 2017 Michele Loreti and the jSpace Developers (see the included 
 * authors file).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *******************************************************************************/

package org.jspace.io.json;

import java.lang.reflect.Type;

import org.jspace.Template;
import org.jspace.TemplateField;

import com.google.gson.JsonArray;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;

/**
 * This class is used to deserialize a {@link Template} from a
 * {@link JsonElement} (see {@link JsonDeserializer}).
 * 
 * @author Michele Loreti
 *
 */
public class TemplateDeserializer implements JsonDeserializer<Template> {

	@Override
	public Template deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
			throws JsonParseException {
		if (!json.isJsonArray()) {
			throw new JsonParseException("Unexpected JsonElement!");
		}
		JsonArray jsa = (JsonArray) json;
		jSonUtils utils = jSonUtils.getInstance();
		TemplateField[] data = new TemplateField[jsa.size()];
		for (int i = 0; i < jsa.size(); i++) {
			try {
				data[i] = utils.templateFromJSon(jsa.get(i), context);
			} catch (ClassCastException e) {
				throw new JsonParseException(e);
			}
		}
		return new Template(data);
	}

}