n3phele.client.presenter.helpers.RequestWithProgressDialog.java Source code

Introduction

Here is the source code for n3phele.client.presenter.helpers.RequestWithProgressDialog.java

Source

/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  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 n3phele.client.presenter.helpers;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;

public class RequestWithProgressDialog {

    protected final RequestBuilder rb;
    protected Request request = null;
    protected int retries;
    private String message;
    private HTML alert;
    private HTML details;
    private DialogBox working;

    public RequestWithProgressDialog(RequestBuilder rb, String message, int retries) {
        this.rb = rb;
        this.retries = retries;
        this.message = message;
    }

    public Request sendRequest(final String requestData, final RequestCallback callback) throws RequestException {
        request = rb.sendRequest(requestData, new RequestCallback() {
            @Override
            public void onResponseReceived(Request request, Response response) {
                hideLoadingMessage();
                callback.onResponseReceived(request, response);

            }

            @Override
            public void onError(Request request, Throwable exception) {
                GWT.log(exception.toString(), exception);
                if (retries-- <= 0) {
                    alert("Failure " + exception.toString());
                    callback.onError(request, exception);
                } else {
                    try {
                        alert("Failure " + exception.toString() + " retrying..");
                        request = sendRequest(requestData, callback);
                    } catch (RequestException e) {
                        this.onError(request, e);
                    }
                }
            }
        });
        if (request != null)
            createLoadingMessage();
        return request;
    }

    public void onError(Request request, Throwable exception) {
        alert("Processing failed:" + exception.toString());
    }

    public void cancel() {
        if (request != null) {
            request.cancel();
        }
        hideLoadingMessage();
    }

    public void hideLoadingMessage() {
        working.hide();
    }

    public void createLoadingMessage() {
        working = new DialogBox();
        FlexTable dialogContents = new FlexTable();
        dialogContents.setCellPadding(15);
        working.setWidget(dialogContents);

        // Add some text to the top of the dialog
        details = new HTML(this.message);
        alert = new HTML();
        dialogContents.setWidget(0, 0, details);
        dialogContents.getFlexCellFormatter().setColSpan(0, 0, 2);
        dialogContents.setWidget(1, 0, alert);
        dialogContents.getFlexCellFormatter().setColSpan(1, 0, 2);
        Button closeButton = new Button("cancel", new ClickHandler() {
            public void onClick(ClickEvent event) {
                RequestWithProgressDialog.this.cancel();
            }
        });
        dialogContents.setWidget(2, 1, closeButton);
        dialogContents.getFlexCellFormatter().setHorizontalAlignment(2, 1, HasHorizontalAlignment.ALIGN_LEFT);
        working.setGlassEnabled(true);
        working.setAnimationEnabled(true);
        working.center();
        working.show();

    }

    public void alert(String msg) {
        this.alert.setHTML(this.alert.getHTML() + "<p>" + msg);
    }

}