OnUnloadWaitStrategy.java

/****************************************************************************
 * Copyright 2008-2011 ThoughtWorks, Inc.
 *
 * 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.
 *
 * Initial Contributors:
 *   Håkan Råberg
 *   Manish Chakravarty
 *   Pavan K S
 ***************************************************************************/
package com.thoughtworks.krypton.driver.web.browser.wait;

import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;

import com.thoughtworks.krypton.driver.web.browser.BrowserSession;
import com.thoughtworks.krypton.driver.web.browser.JavascriptException;

public class OnUnloadWaitStrategy implements ProgressListener, WaitStrategy {
    private BrowserSession session;
    boolean changed;
    boolean isUnloading;

    public void init(BrowserSession session) {
        this.session = session;
        this.session.getBrowser().addProgressListener(this);
        completed(null);
    }

    public boolean isBusy() {
        try {
            if (session.getBrowser().isDisposed()) {
                return false;
            }
            String unloading = session.evaluate("typeof(Twist) !== 'undefined' ? Twist.unloading : undefined");
            System.out.println(unloading);
            if (changed) {
                if ("undefined".equals(unloading)) {
                    System.out.println("waiting for unload");
                    return true;
                } else {
                    System.out.println("should detect the real unload next");
                }
            }
            if (Boolean.parseBoolean(unloading)) {
                System.out.println("detected actual unload");
                changed = false;
                isUnloading = true;
                return true;
            } else if (isUnloading) {
                System.out.println("detected actual reload");
                isUnloading = false;
                return false;
            }
            return false;
        } catch (JavascriptException e) {
            e.printStackTrace();
            return false;
        }
    }

    public void changed(ProgressEvent event) {
        if (!isUnloading && event.current == 0) {
            System.out.println("detected change");
            changed = true;
        }
    }

    public void completed(ProgressEvent event) {
        System.out.println("completed");
        session.execute("if (!Twist) { var Twist = {}; } Twist.unloading = undefined; window.addEventListener('unload', function(event) { Twist.unloading = true; }, true);");
    }
}