Java tutorial
/* 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 it.unibo.cs.v2.servlets.CreateMachine; import it.unibo.cs.v2.servlets.CreateMachineAsync; import it.unibo.cs.v2.servlets.GetIsoList; import it.unibo.cs.v2.servlets.GetIsoListAsync; import it.unibo.cs.v2.shared.MachineInfo; import java.util.HashMap; import java.util.LinkedList; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.Style.Unit; 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.regexp.shared.RegExp; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.CheckBox; import com.google.gwt.user.client.ui.DialogBox; import com.google.gwt.user.client.ui.DisclosurePanel; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.ListBox; import com.google.gwt.user.client.ui.RadioButton; import com.google.gwt.user.client.ui.TextBox; public class NewMachineWizard extends HTMLPanel implements AsyncCallback<LinkedList<HashMap<String, String>>>, ClickHandler, Wizard { private final GetIsoListAsync getIsoListProxy = (GetIsoListAsync) GWT.create(GetIsoList.class); private final CreateMachineAsync createMachineProxy = (CreateMachineAsync) GWT.create(CreateMachine.class); private final ListBox isoListBox = new ListBox(); private final Button submitButton = new Button("Create"); private final DisclosurePanel description = new DisclosurePanel("Image Description"); private final HTML descriptionLabel = new HTML(); private final HTML errorLabel = new HTML(); private LinkedList<HashMap<String, String>> isos; /* stuff for the new machine */ private final TextBox name = new TextBox(); private final TextBox descriptionVM = new TextBox(); /* buttons for the two disks */ private final String rb1group = "rb1group"; private final String rb2group = "rb2group"; private final RadioButton rb12 = new RadioButton(rb1group, "2GB"); private final RadioButton rb14 = new RadioButton(rb1group, "4GB"); private final RadioButton rb18 = new RadioButton(rb1group, "8GB"); private final RadioButton rb116 = new RadioButton(rb1group, "16GB"); private final RadioButton[] rb1 = new RadioButton[] { rb12, rb14, rb18, rb116 }; private final TextBox disk2name = new TextBox(); private final CheckBox secondDisk = new CheckBox("Enable the second disk"); private final RadioButton rb22 = new RadioButton(rb2group, "2GB"); private final RadioButton rb24 = new RadioButton(rb2group, "4GB"); private final RadioButton rb28 = new RadioButton(rb2group, "8GB"); private final RadioButton rb216 = new RadioButton(rb2group, "16GB"); private final RadioButton[] rb2 = new RadioButton[] { rb22, rb24, rb28, rb216 }; /* networking stuff */ private final CheckBox virtuaCluster = new CheckBox("Connect to the VirtuaCluster"); private final CheckBox addNetworkIf = new CheckBox("Create a secondary network interface"); private final TextBox socketName = new TextBox(); private final TextBox secondMacAddr = new TextBox(); private boolean finished = false; public NewMachineWizard() { super("<h2>New machine wizard</h2>"); getIsoListProxy.getIsoList(this); submitButton.addClickHandler(this); description.setContent(descriptionLabel); description.setAnimationEnabled(true); /** * Show a description of the selected ISO. */ isoListBox.addChangeHandler(new ChangeHandler() { @Override public void onChange(ChangeEvent event) { String imageName = isoListBox.getValue(isoListBox.getSelectedIndex()); for (HashMap<String, String> h : isos) { if (!h.get("name").equals(imageName)) continue; else descriptionLabel.setHTML("<b>" + h.get("name") + " " + h.get("version") + "</b><br />" + h.get("description") + "<br />" + "<a href=\"" + h.get("web") + "\">Visit the official website</a>" + "<br />" + "The file is located at: " + h.get("iso")); } } }); /*** * Basic stuff (iso image, name and description) */ add(new HTML("<h3>Basic settings</h3>")); FlexTable table = new FlexTable(); table.setWidget(0, 0, new HTML("Select the installation disc for your VM: ")); table.setWidget(0, 1, isoListBox); add(table); add(description); table = new FlexTable(); table.setWidget(0, 0, new HTML("Choose a name for your new VM: ")); table.setWidget(0, 1, name); table.setWidget(1, 0, new HTML("Enter a one-line description of it: ")); table.setWidget(1, 1, descriptionVM); add(table); /*** * Storage (hard disks) */ add(new HTML("<h3>Storage settings</h3>")); add(secondDisk); table = new FlexTable(); table.setWidget(1, 0, new HTML("Choose a size for the primary disk: ")); HorizontalPanel tempHP = new HorizontalPanel(); tempHP.add(rb12); tempHP.add(rb14); tempHP.add(rb18); tempHP.add(rb116); table.setWidget(1, 1, tempHP); table.setWidget(3, 0, new HTML("Choose a size for the secondary disk<span style=\"color: pink;\">*</span>: ")); tempHP = new HorizontalPanel(); tempHP.add(rb22); tempHP.add(rb24); tempHP.add(rb28); tempHP.add(rb216); table.setWidget(3, 1, tempHP); add(table); secondDisk.setValue(false); /** * by default, the secondary disk is not enabled */ disk2name.setEnabled(false); rb22.setEnabled(false); rb24.setEnabled(false); rb28.setEnabled(false); rb216.setEnabled(false); rb18.setValue(true); rb28.setValue(true); secondDisk.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { disk2name.setEnabled(secondDisk.getValue()); rb22.setEnabled(secondDisk.getValue()); rb24.setEnabled(secondDisk.getValue()); rb28.setEnabled(secondDisk.getValue()); rb216.setEnabled(secondDisk.getValue()); } }); table = new FlexTable(); add(new HTML("<h3>Networking</h3>")); table = new FlexTable(); table.setWidget(0, 0, virtuaCluster); table.setWidget(1, 0, addNetworkIf); table.setWidget(2, 0, new HTML("Macaddress for the network interface<span style=\"color: red;\">*</span>: ")); table.setWidget(2, 1, secondMacAddr); table.setWidget(3, 0, new HTML("Relative path for the new socket<span style=\"color: blue;\">*</span>: ")); table.setWidget(3, 1, socketName); virtuaCluster.setValue(true); addNetworkIf.setValue(false); secondMacAddr.setEnabled(false); socketName.setEnabled(false); addNetworkIf.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { secondMacAddr.setEnabled(addNetworkIf.getValue()); socketName.setEnabled(addNetworkIf.getValue()); } }); add(table); add(new HTML("<h3>Notes</h3>")); add(new HTML("<span style=\"color: red;\">* </span>Leave blank to use the QEMU's default one.")); add(new HTML("<span style=\"color: blue;\">* </span>Will be created in your home.")); add(new HTML("<span style=\"color: pink;\">* </span>Extension '.img' will be automatically added.")); add(errorLabel); add(submitButton); } public void updateList() { getIsoListProxy.getIsoList(this); } @Override public void onFailure(Throwable caught) { DialogBox errorDialog = new DialogBox(); errorDialog.setAnimationEnabled(true); errorDialog.setWidget(new HTML("An error occured while querying the RPC server, please refresh the page.")); errorDialog.show(); } @Override public void onSuccess(LinkedList<HashMap<String, String>> result) { this.isos = result; isoListBox.clear(); // No isos found on the server. if (result == null) { descriptionLabel.setHTML("No images found on the server."); submitButton.setEnabled(false); return; } // Everything seems ok. for (HashMap<String, String> h : result) isoListBox.addItem(h.get("name")); descriptionLabel.setHTML("Select an image to show its description!"); submitButton.setEnabled(true); } private void showSuccess(String msg) { errorLabel.getElement().getStyle().setColor("green"); errorLabel.getElement().getStyle().setFontSize(1.4, Unit.EM); errorLabel.setHTML(msg); errorLabel.setVisible(true); } private void showError(String error) { errorLabel.getElement().getStyle().setColor("red"); errorLabel.getElement().getStyle().setFontSize(1.4, Unit.EM); errorLabel.setHTML(error); errorLabel.setVisible(true); } private void hideError() { errorLabel.setVisible(false); } @Override public void onClick(ClickEvent event) { final MachineInfo machineInfo = new MachineInfo(); hideError(); if (RegExp.compile("[^A-z0-9]").test(name.getText())) { showError("Machine name may only contain letters or digits (e.g. MyFirstMachine01)"); return; } if (name.getText().equals("")) { showError("Machine name can't be blank"); return; } machineInfo.setName(name.getText()); machineInfo.setDescription(descriptionVM.getText()); for (HashMap<String, String> hm : isos) { if (hm.get("name").equals(isoListBox.getValue(isoListBox.getSelectedIndex()))) { machineInfo.setIso(hm.get("iso")); break; } } // // if (!disk1name.getText().equals(name.getText())) { // showError("Primary disk name must match the machine's name."); // return; // } // machineInfo.setHda(name.getText()); for (RadioButton b : rb1) { if (!b.getValue()) continue; machineInfo.setHdaSize(b.getText()); } // if (disk2name.isEnabled() && disk2name.getText().equals((""))) { // showError("Disk name can't be blank"); // return; // } machineInfo.setHdbEnabled(disk2name.isEnabled()); if (disk2name.isEnabled()) { machineInfo.setHdb(name.getText() + "-secondary"); for (RadioButton b : rb2) { if (!b.getValue()) continue; machineInfo.setHdbSize(b.getText()); } } machineInfo.setVirtuacluster(virtuaCluster.getValue()); machineInfo.setSecondNetwork(addNetworkIf.getValue()); if (addNetworkIf.getValue() && socketName.getText().equals("")) { showError("Socket name can't be blank"); return; } machineInfo.setSocketPath(socketName.getText()); machineInfo.setMacAddress(secondMacAddr.getText()); createMachineProxy.createMachine(machineInfo, new AsyncCallback<Boolean>() { @Override public void onFailure(Throwable caught) { Window.alert(caught.getMessage()); } @Override public void onSuccess(Boolean result) { clear(); add(errorLabel); if (result) { showSuccess("Machine successfully created"); finished = true; MainPanel.getInstance().refresh(); } else showError("Error while creating the machine. This is programmers' fault, not yours. " + "Please reload the page and retry."); } }); } public boolean hasFinished() { return finished; } }