org.cloudcoder.app.client.view.BulkRegistrationPanel.java Source code

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Here is the source code for org.cloudcoder.app.client.view.BulkRegistrationPanel.java

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// CloudCoder - a web-based pedagogical programming environment
// Copyright (C) 2011-2015, Jaime Spacco <jspacco@knox.edu>
// Copyright (C) 2011-2015, David H. Hovemeyer <david.hovemeyer@gmail.com>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package org.cloudcoder.app.client.view;

import org.cloudcoder.app.client.model.Session;
import org.cloudcoder.app.client.model.StatusMessage;
import org.cloudcoder.app.client.page.CloudCoderPage;
import org.cloudcoder.app.client.page.SessionObserver;
import org.cloudcoder.app.client.validator.NoopFieldValidator;
import org.cloudcoder.app.shared.model.Course;
import org.cloudcoder.app.shared.util.SubscriptionRegistrar;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.user.client.ui.FileUpload;
import com.google.gwt.user.client.ui.FormPanel;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitCompleteHandler;
import com.google.gwt.user.client.ui.FormPanel.SubmitEvent;
import com.google.gwt.user.client.ui.FormPanel.SubmitHandler;
import com.google.gwt.user.client.ui.Hidden;
import com.google.gwt.user.client.ui.InlineHTML;
import com.google.gwt.user.client.ui.LayoutPanel;
import com.google.gwt.user.client.ui.SubmitButton;

/**
 * New bulk student registration UI for the "Manage course" tab.
 * 
 * @author David Hovemeyer
 */
public class BulkRegistrationPanel extends ValidatedFormUI implements CourseInstructorUI, SessionObserver {
    private LayoutPanel layoutPanel;
    private FileUpload fileUpload;
    private Hidden courseId;
    private SubmitButton submitButton;

    /**
     * Constructor.
     */
    public BulkRegistrationPanel(final CloudCoderPage page) {
        super(new FormPanel());

        FormPanel formPanel = (FormPanel) getPanel();
        formPanel.setWidth("100%");
        formPanel.setHeight("144px");

        formPanel.setEncoding(FormPanel.ENCODING_MULTIPART);
        formPanel.setMethod(FormPanel.METHOD_POST);
        formPanel.setAction(GWT.getModuleBaseURL() + "registerStudents");

        this.layoutPanel = new LayoutPanel();
        formPanel.add(layoutPanel);

        double y = 10.0;

        // Add widgets
        InlineHTML fileFormatMsg = new InlineHTML("File should be tab-delimited in format:<br>"
                + "<tt>username firstname lastname email password</tt>");
        y = addWidget(y, fileFormatMsg, "", new NoopFieldValidator(), 36.0);

        this.fileUpload = new FileUpload();
        fileUpload.setName("fileupload");
        y = addWidget(y, fileUpload, "Filename:", new NoopFieldValidator());

        this.submitButton = new SubmitButton("Register students");
        y = addWidget(y, submitButton, "", new NoopFieldValidator());

        this.courseId = new Hidden();
        courseId.setName("courseId");
        layoutPanel.add(courseId);

        formPanel.addSubmitHandler(new SubmitHandler() {
            @Override
            public void onSubmit(SubmitEvent event) {
                page.getSession().add(StatusMessage.pending("Uploading student data..."));
            }
        });
        formPanel.addSubmitCompleteHandler(new SubmitCompleteHandler() {
            @Override
            public void onSubmitComplete(SubmitCompleteEvent event) {
                String results = event.getResults();
                if (results == null) {
                    page.getSession().add(StatusMessage.error("Error communicating with server"));
                } else {
                    if (results.startsWith("Error: ")) {
                        results = results.substring("Error: ".length());
                        page.getSession().add(StatusMessage.error(results));
                    } else {
                        page.getSession().add(StatusMessage.goodNews(results));
                        clear();
                    }
                }
            }
        });
    }

    @Override
    public LayoutPanel getLayoutPanel() {
        return this.layoutPanel;
    }

    @Override
    public void clear() {
        InputElement inputElt = fileUpload.getElement().cast();
        inputElt.setValue("");
    }

    @Override
    public void activate(Session session, SubscriptionRegistrar subscriptionRegistrar) {
        // Keep track of changes to instructor status
        new CourseInstructorStatusMonitor(this).activate(session, subscriptionRegistrar);
    }

    @Override
    public void setEnabled(boolean b) {
        fileUpload.setEnabled(b);
        submitButton.setEnabled(b);
    }

    @Override
    public void onCourseChange(Course course) {
        GWT.log("BulkRegistrationPanel: selected courseId=" + course.getId());
        courseId.setValue(String.valueOf(course.getId()));
    }
}