com.ics.tcg.web.workflow.client.BaseEntryPoint.java Source code

Introduction

Here is the source code for com.ics.tcg.web.workflow.client.BaseEntryPoint.java

Source

/*
 * Copyright 2007 Micha Baliski
 * 
 * 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.ics.tcg.web.workflow.client;

import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.DeferredCommand;
import com.google.gwt.user.client.ui.DialogBox;

/**
 * Base class for entry point
 * 
 * @author Micha Baliski (michal.balinski@gmail.com)
 */
public abstract class BaseEntryPoint {

    /**
     * Catches non handled exceptions and presents them in dialog box.
     * 
     * @see com.google.gwt.core.client.EntryPoint#onModuleLoad()
     */
    public void onModuleLoad() {
        // set uncaught exception handler
        GWT.setUncaughtExceptionHandler(new GWT.UncaughtExceptionHandler() {
            public void onUncaughtException(Throwable throwable) {
                String text = "Uncaught exception: ";
                while (throwable != null) {
                    StackTraceElement[] stackTraceElements = throwable.getStackTrace();
                    text += new String(throwable.toString() + "\n");
                    for (int i = 0; i < stackTraceElements.length; i++) {
                        text += "    at " + stackTraceElements[i] + "\n";
                    }
                    throwable = throwable.getCause();
                    if (throwable != null) {
                        text += "Caused by: ";
                    }
                }
                DialogBox dialogBox = new DialogBox(true);
                DOM.setStyleAttribute(dialogBox.getElement(), "backgroundColor", "#ABCDEF");
                System.err.print(text);
                text = text.replaceAll(" ", "&nbsp;");
                dialogBox.setHTML("<pre>" + text + "</pre>");
                dialogBox.center();
            }
        });

        // use a deferred command so that the handler catches onLoad()
        // exceptions
        DeferredCommand.addCommand(new Command() {
            public void execute() {
                onLoad();
            }
        });
    }

    /**
     * To be implemented by child classes.
     */
    protected abstract void onLoad();

    protected native String getUrlParam(String name)/*-{
                                                    name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
                                                    var regexS = "[\\?&]"+name+"=([^&#]*)";
                                                    var regex = new RegExp( regexS );
                                                    var results = regex.exec( $wnd.location.href );
                                                    if( results == null )
                                                    return "";
                                                    else
                                                    return results[1];
                                                    }-*/;

}