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

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

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// CloudCoder - a web-based pedagogical programming environment
// Copyright (C) 2011-2012, Jaime Spacco <jspacco@knox.edu>
// Copyright (C) 2011-2012, 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 java.util.Arrays;

import org.cloudcoder.app.client.model.Section;
import org.cloudcoder.app.client.model.Session;
import org.cloudcoder.app.client.model.StatusMessage;
import org.cloudcoder.app.client.page.SessionObserver;
import org.cloudcoder.app.client.rpc.RPC;
import org.cloudcoder.app.shared.model.Course;
import org.cloudcoder.app.shared.model.CourseSelection;
import org.cloudcoder.app.shared.model.User;
import org.cloudcoder.app.shared.model.UserSelection;
import org.cloudcoder.app.shared.util.Publisher;
import org.cloudcoder.app.shared.util.Subscriber;
import org.cloudcoder.app.shared.util.SubscriptionRegistrar;

import com.google.gwt.user.cellview.client.DataGrid;
import com.google.gwt.user.cellview.client.TextColumn;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.ResizeComposite;
import com.google.gwt.view.client.SelectionChangeEvent;
import com.google.gwt.view.client.SelectionChangeEvent.Handler;
import com.google.gwt.view.client.SingleSelectionModel;

/**
 * @author jaimespacco
 *
 */
public class UserAdminUsersListView extends ResizeComposite implements Subscriber, SessionObserver {
    private DataGrid<User> grid;
    private Session session;
    private User selected;
    //private User loggedUser;
    private Section section;

    public User getSelectedUser() {
        return selected;
    }

    /**
     * Constructor.
     */
    public UserAdminUsersListView() {
        grid = new DataGrid<User>();
        grid.addColumn(new TextColumn<User>() {
            @Override
            public String getValue(User user) {
                return user.getUsername();
            }
        }, "Username");
        grid.addColumn(new TextColumn<User>() {
            @Override
            public String getValue(User user) {
                return user.getFirstname();
            }
        }, "Firstname");
        grid.addColumn(new TextColumn<User>() {
            @Override
            public String getValue(User user) {
                return user.getLastname();
            }
        }, "Lastname");
        grid.addColumn(new TextColumn<User>() {
            @Override
            public String getValue(User user) {
                return user.getEmail();
            }
        }, "Email");

        initWidget(grid);
    }

    /* (non-Javadoc)
     * @see org.cloudcoder.app.client.page.SessionObserver#activate(org.cloudcoder.app.client.model.Session, org.cloudcoder.app.shared.util.SubscriptionRegistrar)
     */
    @Override
    public void activate(final Session session, SubscriptionRegistrar subscriptionRegistrar) {
        // Get selected section
        this.section = session.get(Section.class);

        this.session = session;
        this.session.subscribe(Session.Event.ADDED_OBJECT, this, subscriptionRegistrar);
        //this.loggedUser=this.session.get(User.class);
        // Set selection model.
        // When a User record is selected, it will be added to the Session.
        final SingleSelectionModel<User> selectionModel = new SingleSelectionModel<User>();
        selectionModel.addSelectionChangeHandler(new Handler() {
            @Override
            public void onSelectionChange(SelectionChangeEvent event) {
                selected = selectionModel.getSelectedObject();
                //session.add(loggedUser);
                session.add(new UserSelection(selected));
            }
        });
        grid.setSelectionModel(selectionModel);

        // Load users for course/section
        loadUsers();

    }

    /* (non-Javadoc)
     * @see org.cloudcoder.app.shared.util.Subscriber#eventOccurred(java.lang.Object, org.cloudcoder.app.shared.util.Publisher, java.lang.Object)
     */
    @Override
    public void eventOccurred(Object key, Publisher publisher, Object hint) {
        if (key == Session.Event.ADDED_OBJECT && (hint instanceof CourseSelection)) {
            // load all the useres for the current course
            loadUsers();
        } else if (key == Session.Event.ADDED_OBJECT && (hint instanceof Section)) {
            if (section == null || section.getNumber() != ((Section) hint).getNumber()) {
                // section selection changed, reload users
                section = (Section) hint;
                loadUsers();
            }
        }
    }

    public void loadUsers() {
        if (section == null) {
            // Need a section selection
            return;
        }

        CourseSelection courseSelection = session.get(CourseSelection.class);
        Course course = courseSelection.getCourse();
        int courseId = course.getId();
        RPC.usersService.getUsers(courseId, section.getNumber(), new AsyncCallback<User[]>() {
            @Override
            public void onSuccess(User[] result) {
                displayUsers(result);
            }

            @Override
            public void onFailure(Throwable caught) {
                session.add(StatusMessage.error("Could not load users for course"));
            }
        });
    }

    protected void displayUsers(User[] result) {
        grid.setRowCount(result.length);
        grid.setRowData(Arrays.asList(result));
        grid.setVisibleRange(0, result.length);
    }
}