com.google.wave.api.impl.ElementSerializer.java Source code

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Here is the source code for com.google.wave.api.impl.ElementSerializer.java

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/* Copyright (c) 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.wave.api.impl;

import com.google.wave.api.Element;
import com.google.wave.api.ElementType;
import com.google.wave.api.FormElement;
import com.google.wave.api.Gadget;
import com.google.wave.api.Image;

import com.metaparadigm.jsonrpc.AbstractSerializer;
import com.metaparadigm.jsonrpc.MarshallException;
import com.metaparadigm.jsonrpc.ObjectMatch;
import com.metaparadigm.jsonrpc.SerializerState;
import com.metaparadigm.jsonrpc.UnmarshallException;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.Map;

/**
 * {@link Element} serialization/deserialization.
 * 
 * @author scovitz@google.com (Seth Covitz)
 */
@SuppressWarnings("unchecked")
public class ElementSerializer extends AbstractSerializer {

    private static final Class[] SERIALIZABLE_CLASSES = new Class[] { Element.class, FormElement.class,
            Gadget.class, Image.class };
    private static final Class[] JSON_CLASSES = new Class[] { JSONObject.class };

    @Override
    public Class[] getJSONClasses() {
        return JSON_CLASSES;
    }

    @Override
    public Class[] getSerializableClasses() {
        return SERIALIZABLE_CLASSES;
    }

    @Override
    public Object marshall(SerializerState state, Object o) throws MarshallException {
        if (!(o instanceof Element)) {
            throw new MarshallException("Object is not of type Element.");
        }

        JSONObject json = new JSONObject();
        Element element = (Element) o;
        try {
            json.put("javaClass", o.getClass().getName());
            json.put("type", element.getType().toString());
            json.put("properties", ser.marshall(state, element.getProperties()));
        } catch (JSONException jsonx) {
            throw new MarshallException("Cannot marshall Element.");
        }

        return json;
    }

    @Override
    public ObjectMatch tryUnmarshall(SerializerState state, Class clazz, Object json) {
        throw new UnsupportedOperationException();
    }

    @Override
    public Object unmarshall(SerializerState state, Class clazz, Object json) throws UnmarshallException {
        if (!Element.class.isAssignableFrom(clazz)) {
            throw new UnmarshallException(clazz.getName() + " is not assignable from Element");
        }

        JSONObject jsonObject = (JSONObject) json;
        Element element = null;
        try {
            String javaname = jsonObject.isNull("name") ? "" : jsonObject.getString("name");
            element = (Element) clazz.newInstance();
            element.setType(ElementType.valueOf(jsonObject.getString("type")));
            element.setProperties(
                    (Map<String, Object>) ser.unmarshall(state, Map.class, jsonObject.getJSONObject("properties")));

        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (JSONException jsonx) {
            jsonx.printStackTrace();
        }

        return element;
    }
}