com.goodow.realtime.json.js.JsJsonValue.java Source code

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Here is the source code for com.goodow.realtime.json.js.JsJsonValue.java

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/*
 * Copyright 2013 Goodow.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 com.goodow.realtime.json.js;

import com.goodow.realtime.json.JsonType;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * JSO backed implementation of JsonValue.
 */
class JsJsonValue extends JavaScriptObject {

    // @formatter:off
    private static native String getJsType(Object obj) /*-{
                                                       return typeof obj;
                                                       }-*/;

    private static native boolean isArray(Object obj) /*-{
                                                      // ensure that array detection works cross-frame
                                                      return Object.prototype.toString.apply(obj) === '[object Array]';
                                                      }-*/;

    private static native boolean isNull(JsJsonValue jsJsonValue) /*-{
                                                                  // TODO(cromwellian): if this moves to GWT, we may have to support more leniency
                                                                  return jsJsonValue === null;
                                                                  }-*/;
    // @formatter:on

    protected JsJsonValue() {
    }

    public final JsonType getType() {
        if (isNull(this)) {
            return JsonType.NULL;
        }
        String jsType = getJsType(this);
        if ("string".equals(jsType)) {
            return JsonType.STRING;
        } else if ("number".equals(jsType)) {
            return JsonType.NUMBER;
        } else if ("boolean".equals(jsType)) {
            return JsonType.BOOLEAN;
        } else if ("object".equals(jsType)) {
            return isArray(this) ? JsonType.ARRAY : JsonType.OBJECT;
        }
        assert false : "Unknown Json Type";
        return null;
    }

    // @formatter:off
    public final native String toJson() /*-{
                                        // skip hashCode field
                                        return $wnd.JSON.stringify(this, function(keyName, value) {
                                        if (keyName == "$H") {
                                        return undefined; // skip hashCode property
                                        }
                                        return value;
                                        }, 0);
                                        }-*/;
    // @formatter:on
}