it.unibo.cs.v2.client.ExportMachineWizard.java Source code

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Here is the source code for it.unibo.cs.v2.client.ExportMachineWizard.java

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/* Copyright 2011 Massimo Gengarelli <gengarel@cs.unibo.it>
 * This file is part of Floz Configurator.
 * Floz Configurator is free software: you can redistribute it and/or modify it 
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version.
 *
 * Floz Configurator 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with Floz Configurator. If not, see http://www.gnu.org/licenses/.
 */

package it.unibo.cs.v2.client;

import java.util.LinkedList;

import it.unibo.cs.v2.servlets.ExportMachine;
import it.unibo.cs.v2.servlets.ExportMachineAsync;
import it.unibo.cs.v2.servlets.GetMachines;
import it.unibo.cs.v2.servlets.GetMachinesAsync;
import it.unibo.cs.v2.shared.MachineInfo;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.DisclosurePanel;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.TextArea;

public class ExportMachineWizard extends HTMLPanel implements Wizard, AsyncCallback<LinkedList<MachineInfo>> {
    private GetMachinesAsync getMachinesProxy = (GetMachinesAsync) GWT.create(GetMachines.class);
    private ListBox machinesList = new ListBox();
    private LinkedList<MachineInfo> machines;

    private final DisclosurePanel machineDescription = new DisclosurePanel("Machine's description");
    private final TextArea machineTextArea = new TextArea();
    private final Button exportButton = new Button("Export this machine");

    private boolean finished = false;

    private final HTML errorString = new HTML(
            "<span style=\"color: red\">Error while getting the machines. Select another page or refresh.</span>");

    private final ExportMachineAsync exportMachineProxy = GWT.create(ExportMachine.class);

    private ChangeHandler getMachineDescription = new ChangeHandler() {

        @Override
        public void onChange(ChangeEvent event) {
            machineDescription.clear();

            for (MachineInfo m : machines) {
                if (m.getName().equals(machinesList.getItemText(machinesList.getSelectedIndex()))) {
                    machineDescription.add(new HTML(m.getDescription()));
                    break;
                }
            }
        }
    };

    private ClickHandler exportHandler = new ClickHandler() {

        @Override
        public void onClick(ClickEvent event) {
            MachineInfo machine = null;

            for (MachineInfo m : machines) {
                if (m.getName().equals(machinesList.getValue(machinesList.getSelectedIndex()))) {
                    machine = m;
                    break;
                }
            }

            if (machine != null)
                exportMachineProxy.exportMachine(machine, machineTextArea.getText(), new AsyncCallback<Boolean>() {

                    @Override
                    public void onFailure(Throwable caught) {
                        clear();
                        add(new HTML("<span style=\"color:red\">Error while exporting the machine: "
                                + caught.getMessage() + "</span>"));
                        finished = true;
                    }

                    @Override
                    public void onSuccess(Boolean result) {
                        clear();
                        add(new HTML(
                                "<span style=\"color: green\">Machine exported. The process may take a while, you will receive a notification when it'll be completed.</span>"));
                        finished = true;

                    }
                });
        }
    };

    public ExportMachineWizard() {
        // Set up the page
        super("<h2>Export a machine</h2>");
        add(new HTML("<h3>Select a machine to export</h3>"));
        add(machinesList);
        add(machineDescription);
        add(new HTML("<br /><br /><h3>Insert a more accurate description of the machine</h3>"));
        add(new HTML(
                "<p>Don't forget to include all those informations that are needed by the other users. Such as the root password of this machine.</p>"));
        add(machineTextArea);
        add(new HTML("<br /><br />"));
        add(exportButton);

        // Set up the handlers
        getMachinesProxy.getMachines(this);
        machinesList.addChangeHandler(getMachineDescription);
        exportButton.addClickHandler(exportHandler);

        // Sets the animation on the Disclosure Panel
        machineDescription.setAnimationEnabled(true);

        // Configure the Text Area
        machineTextArea.setWidth("480px");
        machineTextArea.setHeight("240px");

    }

    @Override
    public boolean hasFinished() {
        return finished;
    }

    @Override
    public void onFailure(Throwable caught) {
        clear();
        add(errorString);
        add(new HTML(caught.getMessage()));

        finished = true;
    }

    @Override
    public void onSuccess(LinkedList<MachineInfo> result) {
        if (machines != null)
            machines.clear();

        if (result != null) {
            machines = result;

            boolean descriptionSet = false;

            for (MachineInfo machine : result) {
                if (machine.isUserOwner()) {
                    if (!descriptionSet) {
                        machineDescription.clear();
                        machineDescription.add(new HTML(machine.getDescription()));
                        machineDescription.setOpen(true);
                        descriptionSet = true;
                    }
                    machinesList.addItem(machine.getName());
                }
            }
        }

        else {
            clear();
            add(errorString);

            finished = true;
        }
    }

}