Google Web Toolkit - 1.0

Compatibility: v2 v3 Express
What's new? Release Notes
ID: com.castsoftware.gwt

In what situation should you install this extension?

  • If you have some imports starting with com.google.gwt. in your java code.
  • If you have some files with the extensions .gwt.xml and .ui.xml with your java code.

Supported Google Web Toolkit (GWT) framework items

  • Modules present in files *.gwt.xml.
  • Views present in files *.ui.xml and links to their handler methods present in java code.
  • Client/server links created through @RemoteServiceRelativePath java interface annotation.

Transactions

Transaction support is derived from metamodel concepts used to build CAST Imaging Blueprint and structural transaction flows. Entry Points start transactions; Exit Points include both output/boundary concepts and Data Entities manipulated by transactions.

Role Support Breakdown
Entry Point
  • UI Component
  • Exposed Web Services
Exit Point
  • Web Services Call

Data version: 1.0.5-funcrel

ISO 5055 Structural Rules

Quality support is based on ISO 5055 structural rules available for the selected extension version.

Reliability Maintainability Security Performance Efficiency

Data version: 1.0.5-funcrel

Dependencies with other extensions

Some CAST extensions require the presence of other CAST extensions in order to function correctly. The Google Web Toolkit extension requires that the following other CAST extensions are also installed:

The JEE Analyzer is not strictly a dependency, but since this extension is always installed, you do not need to do anything.

What results can you expect?

Objects

Icon Description
GWT Module
GWT View
GWT Activity
GWT Event Handler
GWT Remote resource service
GWT Remote Operation
GWT Post resource service
GWT Get resource service
GWT Put resource service
GWT Delete resource service

Code examples

Modules

MobileWebApp.gwt.xml:

  • The “rename-to” value is used as the module name.
  • The “entry-point” tag is used for the class which contains the UI initialisation.
<module rename-to='mobilewebapp'>
  <!-- Inherit the core Web Toolkit stuff.                        -->
  <inherits name='com.google.gwt.activity.Activity'/>
...
  <!-- Specify the app entry point class.                         -->
  <entry-point class='com.google.gwt.sample.mobilewebapp.client.MobileWebApp'/>
...
</module>

MobileWebApp.java:

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;

public class MobileWebApp implements EntryPoint {
  public void onModuleLoad() {
    ClientFactory clientFactory = GWT.create(ClientFactory.class);
    clientFactory.getApp().run(RootLayoutPanel.get());
  }
}

Links from the module to the initialisation java methods are created.

Views and event handlers

View and java class have the same file names, but differ by their extension (".ui.xml" for the view and “.java” for the class). Handler and view are matched using “ui:field” value in view and “@UiField” class members.

MobileTaskEditView.ui.xml (view code):

<ui:UiBinder
  xmlns:ui="urn:ui:com.google.gwt.uibinder"
  xmlns:g="urn:import:com.google.gwt.user.client.ui"
  xmlns:app="urn:import:com.google.gwt.sample.mobilewebapp.client.ui">
...
                <g:Button
                  ui:field="saveButton"
                  addStyleNames="{style.button}">Done</g:Button>
...
</ui:UiBinder>

MobileTaskEditView.java (Event handler code):

import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;

public class MobileTaskEditView extends Composite implements TaskEditView {

  @UiField
  Button saveButton;

  public MobileTaskEditView() {
    initWidget(uiBinder.createAndBindUi(this));
    nameEditor = EditorDecorator.create(nameField.asEditor(), nameViolation);
    driver.initialize(this);

    saveButton.addClickHandler(new ClickHandler() {
      public void onClick(ClickEvent event) {
        if (presenter != null) {
          presenter.saveTask();
        }
      }
    });
  }
}

A view can be linked directly to a java method when the java method is annotated with “@UiHandler”:

ValidationView.ui.xml

<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
  xmlns:g="urn:import:com.google.gwt.user.client.ui">
...
                <g:Button styleName="{style.close}" ui:field="closeButton">Close</g:Button>
...
</ui:UiBinder>

ValidationView.java

public class ValidationView extends Composite {
  @UiHandler("closeButton")
  public void doClick(ClickEvent e) {
    dialogBox.hide();
    sendButton.setEnabled(true);
    sendButton.setFocus(true);
  }
}

Activities

import com.google.gwt.activity.shared.AbstractActivity;

public class TraitementASideBarActivity extends AbstractActivity implements TraitementASideBarView.Presenter {

    public void start(AcceptsOneWidget panel, EventBus eventBus) {
    }
}

A callLink is created to the “start”, “mayStop”, “onCancel”, “onStop” class methods.

Remote resource services and remote operations

They are created when the interface “@RemoteServiceRelativePath” annotation is present.

GreetingService.java

import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

@RemoteServiceRelativePath("greet")
public interface GreetingService extends RemoteService {
 
    SafeHtml greetServer(Person name);
  
}

GreetingServiceImpl.java

import com.google.gwt.sample.validation.client.GreetingService;

public class GreetingServiceImpl extends RemoteServiceServlet implements
    GreetingService {
  public SafeHtml greetServer(Person person) {
        ...
    }
}

The operation is created from the class implementing the interface. The difficult part is to find from where the resource service is called, and because there is no class implementing the interface on the client side, an instance is created directly from the interface using GWT.create. For example:

GreetingServiceAsync greetingService = GWT.create(GreetingService.class);
...
greetingService.greetServer(...);

Support of RestyGWT

import org.fusesource.restygwt.client.RestService;

public interface IDetailServiceAsync extends RestService {

    @GET
    @Path("resupererDossier")
    public void listeContrat(...);

    @POST
    @Path("verificationPerimetreContrat/{codeOfrCial}/{codeSysInfo}/{codeAppli}")
    public void verificationPerimetreContrat(...);
}

Support of AsyncProvider

Classes which inherit from “com.google.gwt.core.client.AsyncProvider” have a “get” method. A link is created from their constructor to this method.

import com.google.gwt.core.client.AsyncProvider;
 
public class AnalyseDemandeAsyncProvider implements AsyncProvider<Activity, Throwable> {
    @Override
    public void get(final Callback<? super Activity, ? super Throwable> callback) {
    }
}

Limitations

  • Resource services corresponding to com.google.gwt.http.client.RequestBuilder.sendRequest and using com.google.gwt.http.client.RequestBuilder.