Java tutorial
/* uDig - User Friendly Desktop Internet GIS client * http://udig.refractions.net * (C) 2004, Refractions Research Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License. * * This library 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 * Lesser General Public License for more details. */ package net.refractions.udig.project.ui.internal; import net.refractions.udig.internal.ui.UiPlugin; import net.refractions.udig.project.ui.IUDIGDialogPage; import net.refractions.udig.project.ui.IUDIGView; import net.refractions.udig.project.ui.internal.FeatureEditorExtensionProcessor.EditActionContribution; import net.refractions.udig.project.ui.internal.tool.ToolContext; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IConfigurationElement; import org.eclipse.jface.action.Action; import org.eclipse.jface.action.IAction; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.ui.IWorkbenchPage; import org.eclipse.ui.PartInitException; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.plugin.AbstractUIPlugin; import org.opengis.feature.simple.SimpleFeature; /** * Class used to represent a feature Editor; can perform "matches" against * a provided feature; and will create the view or dialog on request. * * @author jones * @since 1.1.0 */ public class FeatureEditorLoader { /** FeatureEditorLoader processor field */ final FeatureEditorExtensionProcessor processor; private String dialogPage; String viewId; private String name; String id; ImageDescriptor icon; IAction contribution; private IConfigurationElement definition; private FeatureTypeMatch featureTypeMatcher; FeatureEditorLoader(FeatureEditorExtensionProcessor processor, IConfigurationElement definition) { this.processor = processor; String iconID = definition.getAttribute("icon"); //$NON-NLS-1$ if (iconID != null) { icon = AbstractUIPlugin.imageDescriptorFromPlugin(definition.getNamespaceIdentifier(), iconID); } id = definition.getAttribute("id"); //$NON-NLS-1$ name = definition.getAttribute("name"); //$NON-NLS-1$ viewId = definition.getAttribute("viewId"); //$NON-NLS-1$ dialogPage = definition.getAttribute("dialogPage"); //$NON-NLS-1$ this.definition = definition; IConfigurationElement[] featureTypeDef = definition.getChildren("featureType");//$NON-NLS-1$ if (featureTypeDef.length == 1) this.featureTypeMatcher = new FeatureTypeMatch(featureTypeDef[0]); else this.featureTypeMatcher = FeatureTypeMatch.ALL; } IAction getAction(final ISelection selection) { if (!(selection instanceof IStructuredSelection)) { return null; } IStructuredSelection structuredSelection = (IStructuredSelection) selection; if (!processor.sameFeatureTypes(structuredSelection)) { return null; } final SimpleFeature feature = (SimpleFeature) structuredSelection.getFirstElement(); if (featureTypeMatcher.matches(feature) == -1) { return null; // no match } contribution = new Action(name, IAction.AS_RADIO_BUTTON) { public void runWithEvent(org.eclipse.swt.widgets.Event event) { // note: when the gui is used the contribution is checked by the framework. // so the gui must be used in order to test this. if (contribution.isChecked()) { processor.createEditAction(FeatureEditorLoader.this, selection, feature); open(event.display, selection); } } }; contribution.setId(id); contribution.setImageDescriptor(icon); EditActionContribution selected = this.processor.selectedEditors.get(feature.getFeatureType()); if (selected == null) { selected = processor.createEditAction(processor.getClosestMatch(selection), selection, feature); } else { selected.setSelection(selection); } if (selected != null && selected.getId().equals(id)) contribution.setChecked(true); else contribution.setChecked(false); return contribution; } public void open(Display display, ISelection selection) { SimpleFeature feature = (SimpleFeature) ((IStructuredSelection) selection).getFirstElement(); if (viewId != null) { try { IUDIGView view = (IUDIGView) PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage() .showView(viewId, null, IWorkbenchPage.VIEW_VISIBLE); try { view.editFeatureChanged(feature); } catch (Throwable e) { UiPlugin.log(view + " threw an exception", e); //$NON-NLS-1$ } } catch (PartInitException e) { ProjectUIPlugin.log(null, e); } } else if (dialogPage != null) { try { IUDIGDialogPage page = (IUDIGDialogPage) definition.createExecutableExtension("dialogPage"); //$NON-NLS-1$ ToolContext toolContext; synchronized (this.processor.partListener) { toolContext = this.processor.partListener.currentContext; } page.setContext(toolContext); Dialog dialog = new FeatureEditorExtensionProcessor.EditorDialog( new Shell(display.getActiveShell(), SWT.RESIZE | SWT.PRIMARY_MODAL), page); dialog.setBlockOnOpen(false); page.setFeature(feature); dialog.open(); PlatformUI.getPreferenceStore().putValue(FeatureEditorExtensionProcessor.CURRENT_LOADER_ID, id); } catch (CoreException e) { ProjectUIPlugin.log(null, e); } } } /** * Returns an integer indicating the accuracy of the match between a featureType and the one * declared in the FeatureEditor extension declaration. * <p> * -1 indicates no match, 0 a perfect match and each number higher is a match but a poorer * match. * </p> * * @param selection * @return */ public int match(ISelection selection) { IStructuredSelection structuredSelection = (IStructuredSelection) selection; if (!processor.sameFeatureTypes(structuredSelection)) return -1; final SimpleFeature feature = (SimpleFeature) structuredSelection.getFirstElement(); return featureTypeMatcher.matches(feature); } /** * Returns the dialog page if the feature editor is a dialog, or null otherwise. * * @return the dialog page if the feature editor is a dialog, or null otherwise. */ public String getDialogPage() { return dialogPage; } /** * Returns the name of the feature editor * * @returnthe name of the feature editor */ public String getName() { return name; } /** * Returns the viewid if the feature editor is a view, or null otherwise. * * @return the dviewid if the feature editor is a view, or null otherwise. */ public String getViewId() { return viewId; } public String getId() { return id; } }