| /******************************************************************************* |
| * Copyright (c) 2012, 2020 Original authors and others. |
| * |
| * This program and the accompanying materials are made |
| * available under the terms of the Eclipse Public License 2.0 |
| * which is available at https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * Original authors and others - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.nebula.widgets.nattable.examples.runner; |
| |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.StringTokenizer; |
| |
| import org.eclipse.jface.viewers.ITreeContentProvider; |
| import org.eclipse.jface.viewers.Viewer; |
| import org.eclipse.nebula.widgets.nattable.examples.INatExample; |
| |
| public class NavContentProvider implements ITreeContentProvider { |
| |
| private Map<String, Collection<String>> pathToChildrenMap; |
| |
| protected Collection<String> getChildren(final String parentPath) { |
| Collection<String> children = this.pathToChildrenMap.get(parentPath); |
| if (children == null) { |
| children = new LinkedHashSet<>(); |
| this.pathToChildrenMap.put(parentPath, children); |
| } |
| return children; |
| } |
| |
| @Override |
| public void dispose() { |
| this.pathToChildrenMap = null; |
| } |
| |
| @Override |
| public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { |
| this.pathToChildrenMap = new HashMap<>(); |
| } |
| |
| @Override |
| public Object[] getChildren(Object parent) { |
| return this.pathToChildrenMap.get(parent).toArray(); |
| } |
| |
| @Override |
| public Object getParent(Object element) { |
| String str = (String) element; |
| int lastSlashIndex = str.lastIndexOf('/'); |
| if (lastSlashIndex < 0) { |
| return null; |
| } else { |
| return str.substring(0, lastSlashIndex); |
| } |
| } |
| |
| @Override |
| public boolean hasChildren(Object element) { |
| return this.pathToChildrenMap.get(element) != null; |
| } |
| |
| @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, ""); |
| } |
| 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(); |
| } |
| |
| } |