org.gwm.splice.client.service.json.JSONSerializer.java Source code

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Here is the source code for org.gwm.splice.client.service.json.JSONSerializer.java

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/*
 * Copyright (c) 2006/2007 Flipperwing Ltd. (http://www.flipperwing.com)
 *
 * 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.gwm.splice.client.service.json;

import java.util.Iterator;
import java.util.Set;

import org.gwm.splice.client.service.ISerializer;
import org.gwm.splice.client.service.data.Attributes;
import org.gwm.splice.client.service.data.ISerializable;
import org.gwm.splice.client.service.data.Attributes.Attribute;

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.JSONParser;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;

public class JSONSerializer implements ISerializer {

    /* (non-Javadoc)
     * @see org.gwm.splice.client.service.ISerializer#deserialize(java.lang.String)
     */
    public Attributes deserialize(String json) {

        JSONObject jobj = (JSONObject) JSONParser.parse(json);

        Attributes attributes = new Attributes();
        convertAttributes(jobj, attributes);

        return attributes;
    }

    private void convertAttributes(JSONObject obj, Attributes attrs) {
        Set keys = obj.keySet();
        for (Iterator iter = keys.iterator(); iter.hasNext();) {
            String name = (String) iter.next();
            JSONValue val = obj.get(name);
            attrs.put(name, convertValue(val));
        }
    }

    private Object convertValue(JSONValue val) {
        if (val.isBoolean() != null) {
            return new Boolean(val.isBoolean().booleanValue());
        } else if (val.isNumber() != null) {
            return new Double(val.isNumber().getValue());
        } else if (val.isString() != null) {
            return val.isString().stringValue();
        } else if (val.isObject() != null) {
            Attributes attrs = new Attributes();
            convertAttributes(val.isObject(), attrs);
            return attrs;
        } else if (val.isArray() != null) {
            JSONArray ja = val.isArray();
            Object[] array = new Object[ja.size()];
            for (int i = 0; i < ja.size(); i++) {
                array[i] = convertValue(ja.get(i));
            }
            return array;
        }
        return null;
    }

    /////////////////////////////////////////////////////////////////////////////////////////

    /* (non-Javadoc)
     * @see org.gwm.splice.client.service.ISerializer#serialize(org.gwm.splice.client.service.data.RemoteObject)
     */
    public String serialize(Attributes attributes) {

        JSONObject jobj = new JSONObject();

        convertAttributes(attributes, jobj);

        return jobj.toString();
    }

    //...

    private void convertAttributes(Attributes attrs, JSONObject jobj) {
        for (Iterator iter = attrs.iterator(); iter.hasNext();) {
            Attribute attr = (Attribute) iter.next();
            jobj.put(attr.getName(), convertValue(attr.getValue()));
        }
    }

    private JSONValue convertValue(Object val) {
        if (val instanceof Boolean) {
            return JSONBoolean.getInstance(((Boolean) val).booleanValue());
        }
        if (val instanceof Number) {
            return new JSONNumber(((Number) val).doubleValue());
        }
        if (val instanceof String) {
            return new JSONString(val.toString());
        }
        if (val instanceof Attributes) {
            JSONObject jobj = new JSONObject();
            convertAttributes((Attributes) val, jobj);
            return jobj;
        }
        if (val instanceof Object[]) {
            JSONArray array = new JSONArray();
            Object[] va = (Object[]) val;
            for (int i = 0; i < va.length; i++) {
                array.set(i, convertValue(va[i]));
            }
            return array;
        }
        if (val instanceof ISerializable) {
            Attributes attrs = ((ISerializable) val).serialize();
            JSONObject jobj = new JSONObject();
            convertAttributes(attrs, jobj);
            return jobj;
        }
        return JSONNull.getInstance();
    }
}