com.googlecode.gwtphonegap.client.util.JSNIHelper.java Source code

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Here is the source code for com.googlecode.gwtphonegap.client.util.JSNIHelper.java

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/*
 * Copyright 2013 Ronny Bubke
 * 
 * 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.googlecode.gwtphonegap.client.util;

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

import java.util.Map;
import java.util.Map.Entry;

/**
 * @author Ronny Bubke
 */
public class JSNIHelper {

    /**
     * Convenient method to easily get a value from a javascript object.
     *
     * @param object       the javascript object you want to get the property value from.
     * @param propertyPath is the dotted path to the object ( for instance "data.url" or
     *                     just "id").
     * @return
     */
    public static <T> T getPropertyValue(JavaScriptObject object, String propertyPath) {
        String[] pathArray = propertyPath.split(PATH_SEPARATOR);
        JavaScriptObject pathObject = object;
        for (int i = 0; i < pathArray.length - 1; i++) {
            if (pathObject == null) {
                return null;
            }
            pathObject = getPropertyValueNative(pathObject, pathArray[i]);
        }
        return getPropertyValueNative(pathObject, pathArray[pathArray.length - 1]);
    }

    private native static <T> T getPropertyValueNative(JavaScriptObject object, String propertyName)
    /*-{
    if (object) {
        return object[propertyName];
    }
    return null;
     }-*/;

    /**
     * Convinient method to map from a map to a javascript object
     * <p/>
     * <br>
     * <code>
     * Example:<br>
     * map.put("id", "1234");<br>
     * map.put("name", "Ronny Bubke");<br>
     * becomes:<br>
     * { id : "1234", name : "Ronny Bubke" }<br>
     * </code>
     *
     * @param map
     * @return
     */
    public static JavaScriptObject createObject(Map<String, ?> map) {
        JavaScriptObject object = JavaScriptObject.createObject();
        for (Entry<String, ?> entry : map.entrySet()) {
            enhanceObject(object, entry.getKey(), entry.getValue());
        }
        return object;
    }

    private static native void enhanceObject(JavaScriptObject o, String key, Object value)
    /*-{
    o[key] = value;
     }-*/;

    private final static String PATH_SEPARATOR = "[.]";
}