com.google.code.gwt.appcache.client.ApplicationCache.java Source code

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Here is the source code for com.google.code.gwt.appcache.client.ApplicationCache.java

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/*
 * Copyright 2009 Bart Guijt and others.
 * 
 * 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.google.code.gwt.appcache.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.GWT.UncaughtExceptionHandler;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.EventListener;

public final class ApplicationCache extends JavaScriptObject {

    // getStatus() values:
    public static final short UNCACHED = 0;
    public static final short IDLE = 1;
    public static final short CHECKING = 2;
    public static final short DOWNLOADING = 3;
    public static final short UPDATEREADY = 4;
    public static final short OBSOLETE = 5;

    // event types for addEventListener():
    public static final String ONCHECKING = "checking";
    public static final String ONERROR = "error";
    public static final String ONNOUPDATE = "noupdate";
    public static final String ONDOWNLOADING = "downloading";
    public static final String ONPROGRESS = "progress";
    public static final String ONUPDATEREADY = "updateready";
    public static final String ONCACHED = "cached";

    protected ApplicationCache() {
    }

    /**
     * Returns <code>true</code> if the Application Cache API is supported on the
     * running platform.
     */
    public static native boolean isSupported() /*-{
                                               return typeof $wnd.applicationCache != "undefined";
                                               }-*/;

    public static native ApplicationCache getApplicationCache() /*-{
                                                                return $wnd.applicationCache;
                                                                }-*/;

    @SuppressWarnings("unused")
    private static void handleCacheEvents(EventListener listener, Event event) {
        UncaughtExceptionHandler ueh = GWT.getUncaughtExceptionHandler();
        if (ueh != null) {
            try {
                listener.onBrowserEvent(event);
            } catch (Throwable t) {
                ueh.onUncaughtException(t);
            }
        } else {
            listener.onBrowserEvent(event);
        }
    }

    public native void addEventListener(String type, EventListener listener, boolean useCapture) /*-{
                                                                                                 this.addEventListener(
                                                                                                 type,
                                                                                                 function(event) {
                                                                                                 @com.google.code.gwt.appcache.client.ApplicationCache::handleCacheEvents(Lcom/google/gwt/user/client/EventListener;Lcom/google/gwt/user/client/Event;) (listener, event);
                                                                                                 },
                                                                                                 useCapture
                                                                                                 );
                                                                                                 }-*/;

    public native void update() /*-{
                                this.update();
                                }-*/;

    public native void swapCache() /*-{
                                   this.swapCache();
                                   }-*/;

    public native int getStatus() /*-{
                                  return this.status;
                                  }-*/;

    public native boolean isOnline() /*-{
                                     return $wnd.navigator.onLine;
                                     }-*/;
}