org.cmg.jresp.json.FormalTemplateFieldDeserializer.java Source code

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Here is the source code for org.cmg.jresp.json.FormalTemplateFieldDeserializer.java

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/**
 * Copyright (c) 2012 Concurrency and Mobility Group.
 * Universita' di Firenze
 *   
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *      Michele Loreti
 */
package org.cmg.jresp.json;

import java.lang.reflect.Type;

import org.cmg.jresp.knowledge.FormalTemplateField;

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;

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

    @Override
    public FormalTemplateField deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        if (!json.isJsonObject()) {
            throw new JsonParseException("Unexpected JsonElement!");
        }
        JsonObject jo = (JsonObject) json;
        if ((!jo.has("type"))) {
            throw new JsonParseException("Required attributes are not available!");
        }
        try {
            Class<?> c = Class.forName(jo.get("type").getAsString());
            return new FormalTemplateField(c);
        } catch (ClassNotFoundException e) {
            throw new JsonParseException(e);
        }
    }

}