Java tutorial
/* * This file is part of Bitsquare. * * Bitsquare 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. * * Bitsquare 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 Bitsquare. If not, see <http://www.gnu.org/licenses/>. */ package viewfx.view.support.fxml; import java.io.IOException; import java.net.URL; import java.util.ResourceBundle; import javax.inject.Inject; import viewfx.ViewfxException; import viewfx.view.FxmlView; import viewfx.view.View; import viewfx.view.ViewFactory; import viewfx.view.ViewLoader; import javafx.fxml.FXMLLoader; import org.springframework.core.annotation.AnnotationUtils; import static com.google.common.base.Preconditions.checkNotNull; import static org.springframework.core.annotation.AnnotationUtils.getDefaultValue; public class FxmlViewLoader implements ViewLoader { private final ViewFactory viewFactory; private final ResourceBundle resourceBundle; @Inject public FxmlViewLoader(ViewFactory viewFactory, ResourceBundle resourceBundle) { this.viewFactory = viewFactory; this.resourceBundle = resourceBundle; } @SuppressWarnings("unchecked") public View load(Class<? extends View> viewClass) { FxmlView fxmlView = AnnotationUtils.getAnnotation(viewClass, FxmlView.class); final Class<? extends FxmlView.PathConvention> convention; final Class<? extends FxmlView.PathConvention> defaultConvention = (Class<? extends FxmlView.PathConvention>) getDefaultValue( FxmlView.class, "convention"); final String specifiedLocation; final String defaultLocation = (String) getDefaultValue(FxmlView.class, "location"); if (fxmlView == null) { convention = defaultConvention; specifiedLocation = defaultLocation; } else { convention = fxmlView.convention(); specifiedLocation = fxmlView.location(); } if (convention == null || specifiedLocation == null) throw new IllegalStateException("Convention and location should never be null."); try { final String resolvedLocation; if (specifiedLocation.equals(defaultLocation)) resolvedLocation = convention.newInstance().apply(viewClass); else resolvedLocation = specifiedLocation; URL fxmlUrl = viewClass.getClassLoader().getResource(resolvedLocation); if (fxmlUrl == null) throw new ViewfxException( "Failed to load view class [%s] because FXML file at [%s] could not be loaded " + "as a classpath resource. Does it exist?", viewClass, specifiedLocation); return loadFromFxml(fxmlUrl); } catch (InstantiationException | IllegalAccessException ex) { throw new ViewfxException(ex, "Failed to load view from class %s", viewClass); } } public View loadFromFxml(URL fxmlUrl) { checkNotNull(fxmlUrl, "FXML URL must not be null"); try { FXMLLoader loader = new FXMLLoader(fxmlUrl, resourceBundle); loader.setControllerFactory(viewFactory); loader.load(); Object controller = loader.getController(); if (controller == null) throw new ViewfxException("Failed to load view from FXML file at [%s]. " + "Does it declare an fx:controller attribute?", fxmlUrl); if (!(controller instanceof View)) throw new ViewfxException( "Controller of type [%s] loaded from FXML file at [%s] " + "does not implement [%s] as expected.", controller.getClass(), fxmlUrl, View.class); return (View) controller; } catch (IOException ex) { throw new ViewfxException(ex, "Failed to load view from FXML file at [%s]", fxmlUrl); } } }