org.fusesource.restygwt.client.ObjectEncoderDecoder.java Source code

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Here is the source code for org.fusesource.restygwt.client.ObjectEncoderDecoder.java

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/**
 * Copyright (C) 2009-2012 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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 org.fusesource.restygwt.client;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gwt.json.client.JSONArray;
import com.google.gwt.json.client.JSONBoolean;
import com.google.gwt.json.client.JSONNull;
import com.google.gwt.json.client.JSONNumber;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;

public class ObjectEncoderDecoder extends AbstractJsonEncoderDecoder<Object> {

    public static final ObjectEncoderDecoder INSTANCE = new ObjectEncoderDecoder();

    @Override
    public JSONValue encode(Object value)
            throws org.fusesource.restygwt.client.JsonEncoderDecoder.EncodingException {
        if (value instanceof Number)
            return new JSONNumber(((Number) value).doubleValue());
        else if (value instanceof Boolean)
            return JSONBoolean.getInstance(((Boolean) value).booleanValue());
        else if (value instanceof Iterable) {
            JSONArray array = new JSONArray();
            int ct = 0;
            for (Object v : (Iterable<?>) value)
                array.set(ct++, encode(v));
            return array;
        } else if (value instanceof Map) {
            JSONObject object = new JSONObject();
            for (Map.Entry<?, ?> entry : ((Map<?, ?>) value).entrySet())
                object.put(entry.getKey().toString(), encode(entry.getValue()));
            return object;
        } else if (value == null)
            return JSONNull.getInstance();
        else
            return new JSONString(value.toString());
    }

    @Override
    public Object decode(JSONValue value)
            throws org.fusesource.restygwt.client.JsonEncoderDecoder.DecodingException {
        if (value instanceof JSONNumber)
            return ((JSONNumber) value).doubleValue();
        else if (value instanceof JSONBoolean)
            return ((JSONBoolean) value).booleanValue();
        else if (value instanceof JSONString)
            return ((JSONString) value).stringValue();
        else if (value instanceof JSONArray) {
            JSONArray array = value.isArray();
            List<Object> list = new ArrayList<Object>(array.size());
            for (int ct = 0; ct < array.size(); ct++)
                list.add(decode(array.get(ct)));
            return list;
        } else if (value instanceof JSONObject) {
            JSONObject object = value.isObject();
            Map<String, Object> map = new HashMap<String, Object>();
            for (String key : object.keySet())
                map.put(key, decode(object.get(key)));
            return map;
        } else
            return null;
    }

}