package org.jboss.errai.demo.jpa.client.local;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.EntityManager;
import javax.persistence.TypedQuery;
import org.jboss.errai.demo.jpa.client.shared.Artist;
import org.jboss.errai.demo.jpa.client.shared.Genre;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.TextBox;
/**
* A form for editing an instance of Artist.
*
* @author Jonathan Fuerth <jfuerth@gmail.com>
*/
public class ArtistForm extends Composite {
// Note: for simplicity, and to keep this JPA demo on-topic, we are using
// plain GWT programmatic layout rather than ErraiUI, UIBinder, or Errai Data
// Binding. See the grocery list demo for the full-on Errai development experience.
private final EntityManager em;
private final Artist artist;
private final TextBox name = new TextBox();
private final ListBox genres = new ListBox(true);
private final Button saveButton = new Button("Save");
private RowOperationHandler<Artist> saveHandler;
public ArtistForm(final Artist artist, EntityManager em) {
this.artist = artist;
this.em = em;
for (Genre g : em.createNamedQuery("allGenresByName", Genre.class).getResultList()) {
genres.addItem(g.getName(), String.valueOf(g.getId()));
}
saveButton.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
updateArtistFromUI();
if (saveHandler != null) {
saveHandler.handle(artist);
}
}
});
updateUIFromArtist();
Grid g = new Grid(3, 2);
int row = 0;
g.setText(row, 0, "Name:");
g.setWidget(row, 1, name);
row++;
g.setText(row, 0, "Genres:");
g.setWidget(row, 1, genres);
row++;
g.setWidget(row, 1, saveButton);
initWidget(g);
}
protected void updateArtistFromUI() {
artist.setName(name.getText());
Set<Integer> selectedGenreIds = new HashSet<Integer>();
for (int i = 0; i < genres.getItemCount(); i++) {
if (genres.isItemSelected(i)) {
selectedGenreIds.add(Integer.valueOf(genres.getValue(i)));
}
}
TypedQuery<Genre> q = em.createNamedQuery("genresWithId", Genre.class);
q.setParameter("idSet", selectedGenreIds);
artist.setGenres(new HashSet<Genre>(q.getResultList()));
}
private void updateUIFromArtist() {
// Note: with Errai Data Sync, the code in this method would be unnecessary. See the Grocery List demo for an example.
name.setText(artist.getName());
Set<Integer> genresToSelect = new HashSet<Integer>();
for (Genre g : artist.getGenres()) {
genresToSelect.add(g.getId());
}
if (artist.getGenres() != null) {
for (int i = 0; i < genres.getItemCount(); i++) {
genres.setItemSelected(i, genresToSelect.contains(Integer.parseInt(genres.getValue(i))));
}
}
}
public void setSaveHandler(RowOperationHandler<Artist> handler) {
this.saveHandler = handler;
}
public void grabFocus() {
name.setFocus(true);
}
}