com.floreysoft.gwt.picker.client.utils.JavaScriptUtils.java Source code

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Here is the source code for com.floreysoft.gwt.picker.client.utils.JavaScriptUtils.java

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/*
 * Copyright 2011 floreysoft GmbH
 *
 * 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.floreysoft.gwt.picker.client.utils;

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

/**
 * Some JavaScript utility methods
 */
public class JavaScriptUtils {
    /**
     * Change this namespace to the javascript library namaspace. e.g google.maps.
     * Deafult is "google.picker"
     */
    public static String NAMESPACE = "google.picker";

    /**
     * Returns the enum value for the given path within the.
     * @see JavaScriptUtils#NAMESPACE
     *
     * To access the value of an enum e.g. google.picker.Action.CANCEL the method
     * call would be: JavaScriptUtils.enumValue("Action", "CANCEL");
     *
     * @param path The path to the enum
     * @return The enum value
     */
    public static String enumValue(String... path) {
        return nativeEnumValue(NAMESPACE, convert(path));
    }

    /**
     * Converts a string array to a javascript array
     *
     * @param javaArray The array to convert
     * @return The converted javascript string array
     */
    public static JsArrayString convert(String[] javaArray) {
        JsArrayString result = JavaScriptObject.createArray().cast();
        for (int i = 0; i < javaArray.length; i++) {
            result.set(i, javaArray[i]);
        }
        return result;
    }

    private native static String nativeEnumValue(String namespace, JsArrayString path) /*-{
                                                                                       var root = $wnd;
                                                                                       path = [].concat(namespace.split("."), path);
                                                                                           
                                                                                       for (var j = 0; j < path.length; j++) {
                                                                                       root = root ? root[path[j]] : $wnd[path[j]];
                                                                                       }
                                                                                           
                                                                                       if (root == undefined || root == null) {
                                                                                       throw "Undefined enum value for path: " + path;
                                                                                       }
                                                                                       return root;
                                                                                       }-*/;
}