Java tutorial
/***************************************************************************** * Copyright (c) 2016 Dirk Fauth. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * Dirk Fauth <dirk.fauth@googlemail.com> - Initial API and implementation * *****************************************************************************/ package org.eclipse.nebula.widgets.nattable.examples.e4; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.lang.reflect.Modifier; import java.util.ArrayList; import java.util.Collection; import java.util.LinkedHashSet; import java.util.List; import java.util.Set; import java.util.StringTokenizer; import javax.annotation.PostConstruct; import javax.inject.Inject; import org.eclipse.e4.ui.model.application.MApplication; import org.eclipse.e4.ui.model.application.ui.basic.MPart; import org.eclipse.e4.ui.model.application.ui.basic.MPartStack; import org.eclipse.e4.ui.workbench.modeling.EModelService; import org.eclipse.e4.ui.workbench.modeling.EPartService; import org.eclipse.e4.ui.workbench.modeling.EPartService.PartState; import org.eclipse.jface.layout.GridDataFactory; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.TreePath; import org.eclipse.jface.viewers.TreeSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.nebula.widgets.nattable.examples.INatExample; import org.eclipse.nebula.widgets.nattable.examples.NatTableExamples; import org.eclipse.nebula.widgets.nattable.examples.runner.NavContentProvider; import org.eclipse.nebula.widgets.nattable.examples.runner.NavLabelProvider; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Composite; import org.osgi.framework.FrameworkUtil; import org.osgi.framework.wiring.BundleWiring; public class NavigationPart { public static final String E4_EXAMPLES_PREFIX = "E4 Examples/"; public static final String E4_BASE_PATH = "/org/eclipse/nebula/widgets/nattable/examples/e4/part"; private EPartService partService; private ClassLoader exampleClassLoader; @Inject EModelService modelService; @Inject MApplication app; @Inject public NavigationPart(EPartService partService) { this.partService = partService; exampleClassLoader = FrameworkUtil.getBundle(NatTableExamples.class).adapt(BundleWiring.class) .getClassLoader(); } @PostConstruct public void postConstruct(Composite parent) { final TreeViewer navTreeViewer = new TreeViewer(parent); final NavContentProvider contentProvider = new NavContentProvider() { @Override public Object[] getElements(Object inputElement) { Set<String> topLevelElements = new LinkedHashSet<>(); String[] examplePaths = (String[]) inputElement; for (final String examplePath : examplePaths) { String parentPath = ""; String absolutePath = ""; // remove the package name for the tree structure String path = examplePath; if (examplePath.startsWith(INatExample.TUTORIAL_EXAMPLES_PREFIX)) { path = examplePath.replace(INatExample.BASE_PATH, ""); } else if (examplePath.startsWith(INatExample.CLASSIC_EXAMPLES_PREFIX)) { path = examplePath.replace(INatExample.CLASSIC_BASE_PATH, ""); } else if (examplePath.startsWith(E4_EXAMPLES_PREFIX)) { path = examplePath.replace(E4_BASE_PATH, ""); } final StringTokenizer tok = new StringTokenizer(path, "/"); while (tok.hasMoreTokens()) { final String pathElement = tok.nextToken(); if (parentPath.length() == 0) { topLevelElements.add("/" + pathElement); } absolutePath += "/" + pathElement; final Collection<String> children = getChildren(parentPath); children.add(absolutePath); parentPath = absolutePath; } } return topLevelElements.toArray(); } }; navTreeViewer.setContentProvider(contentProvider); navTreeViewer.setLabelProvider(new NavLabelProvider(contentProvider) { @Override public String getText(Object element) { String str = (String) element; if (!contentProvider.hasChildren(element)) { INatExample example = getExample(str); return example.getName(); } int lastSlashIndex = str.lastIndexOf('/'); if (lastSlashIndex < 0) { return format(str); } else { return format(str.substring(lastSlashIndex + 1)); } } }); navTreeViewer.setInput(getExamplePaths()); navTreeViewer.addDoubleClickListener(new IDoubleClickListener() { @Override public void doubleClick(DoubleClickEvent event) { TreeSelection selection = (TreeSelection) event.getSelection(); for (TreePath path : selection.getPaths()) { // check for item - if node expand/collapse, if child open if (contentProvider.hasChildren(path.getLastSegment().toString())) { boolean expanded = navTreeViewer.getExpandedState(path); navTreeViewer.setExpandedState(path, !expanded); } else { openExampleInTab(path.getLastSegment().toString()); } } } }); GridLayout layout = new GridLayout(); layout.marginWidth = 0; layout.marginHeight = 0; parent.setLayout(layout); GridDataFactory.fillDefaults().grab(true, true).applyTo(navTreeViewer.getControl()); } private String[] getExamplePaths() { List<String> examples = null; try { InputStream inputStream = NatTableExamples.class.getResourceAsStream("/examples.index"); if (inputStream != null) { examples = new ArrayList<>(); BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream)); String line = reader.readLine(); while (line != null) { examples.add(line); line = reader.readLine(); } reader.close(); } else { System.out.println("examples.index not found, reconstructing"); examples = NatTableExamples.createExamplesIndex(null); } // add e4 examples examples.add(E4_EXAMPLES_PREFIX + "/org/eclipse/nebula/widgets/nattable/examples/e4/part/CSSExample"); examples.add(E4_EXAMPLES_PREFIX + "/org/eclipse/nebula/widgets/nattable/examples/e4/part/DarkExample"); examples.add( E4_EXAMPLES_PREFIX + "/org/eclipse/nebula/widgets/nattable/examples/e4/part/PercentageExample"); examples.add(E4_EXAMPLES_PREFIX + "/org/eclipse/nebula/widgets/nattable/examples/e4/part/TreeExample"); examples.add(E4_EXAMPLES_PREFIX + "/org/eclipse/nebula/widgets/nattable/examples/e4/part/SelectionListenerExample"); } catch (IOException e) { e.printStackTrace(); } return examples != null ? examples.toArray(new String[0]) : null; } @SuppressWarnings("unchecked") public Class<? extends INatExample> getExampleClass(String examplePath, ClassLoader loader) { String className = examplePath.replace('/', '.'); try { Class<?> clazz = Class.forName(className, true, loader); if (INatExample.class.isAssignableFrom(clazz) && !Modifier.isAbstract(clazz.getModifiers())) { return (Class<? extends INatExample>) clazz; } } catch (Exception e) { throw new RuntimeException(e); } return null; } public INatExample getExample(String examplePath) { INatExample example = null; String path = examplePath; ClassLoader loader = exampleClassLoader; if (examplePath.startsWith("/" + INatExample.TUTORIAL_EXAMPLES_PREFIX)) { path = examplePath.replace("/" + INatExample.TUTORIAL_EXAMPLES_PREFIX, INatExample.BASE_PATH + "/"); } else if (examplePath.startsWith("/" + INatExample.CLASSIC_EXAMPLES_PREFIX)) { path = examplePath.replace("/" + INatExample.CLASSIC_EXAMPLES_PREFIX, INatExample.CLASSIC_BASE_PATH + "/"); } else if (examplePath.startsWith("/" + E4_EXAMPLES_PREFIX)) { path = examplePath.replace("/" + E4_EXAMPLES_PREFIX, E4_BASE_PATH + "/"); loader = this.getClass().getClassLoader(); } if (path.startsWith("/")) path = path.substring(1); Class<? extends INatExample> exampleClass = getExampleClass(path, loader); if (exampleClass != null) { try { example = exampleClass.newInstance(); } catch (Exception e) { throw new RuntimeException(e); } } return example; } private void openExampleInTab(final String examplePath) { final INatExample example = getExample(examplePath); if (example == null) { return; } MPartStack stack = (MPartStack) modelService .find("org.eclipse.nebula.widgets.nattable.examples.e4.partstack.0", app); MPart part = null; if (examplePath.startsWith("/" + E4_EXAMPLES_PREFIX)) { part = (MPart) modelService.find(example.getClass().getName(), app); if (part == null) { part = partService.createPart(example.getClass().getName()); part.getTags().add(LifecycleManager.CLOSE_ON_SHUTDOWN_TAG); part.getTags().add(EPartService.REMOVE_ON_HIDE_TAG); stack.getChildren().add(part); } } else { part = partService .createPart("org.eclipse.nebula.widgets.nattable.examples.e4.partdescriptor.natexample"); part.getTags().add(LifecycleManager.CLOSE_ON_SHUTDOWN_TAG); part.getTags().add(EPartService.REMOVE_ON_HIDE_TAG); part.getTransientData().put("example", example); part.getTransientData().put("examplePath", examplePath); stack.getChildren().add(part); } part.setLabel(example.getName()); partService.showPart(part, PartState.ACTIVATE); } }