Java tutorial
/******************************************************************************* * Copyright (c) 2009 Siemens AG * * 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: * Kai Tdter - initial API and implementation *******************************************************************************/ package com.siemens.ct.mp3m.ui.views.physical; import java.io.File; import org.eclipse.core.runtime.IAdapterFactory; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.Status; import org.eclipse.core.runtime.jobs.Job; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ILazyTreeContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.eclipse.ui.model.WorkbenchLabelProvider; import org.eclipse.ui.part.ViewPart; import org.eclipse.ui.progress.UIJob; import com.siemens.ct.mp3m.model.physical.Mp3Directory; import com.siemens.ct.mp3m.model.physical.Mp3File; import com.siemens.ct.mp3m.ui.views.AdapterFactory; import com.siemens.ct.mp3m.ui.views.EditorFactory; import com.siemens.ct.mp3m.ui.views.PathEditorInput; import com.siemens.ct.mp3m.utilities.LogUtil; public class VirtualFileSystemView extends ViewPart { public static final String ID = "com.siemens.ct.mp3m.ui.views.physical.VirtualFileSystemView"; private TreeViewer treeViewer; private final IAdapterFactory adapterFactory = new AdapterFactory(); public VirtualFileSystemView() { super(); } @Override public void createPartControl(Composite parent) { treeViewer = new TreeViewer(parent, SWT.VIRTUAL); getSite().setSelectionProvider(treeViewer); Platform.getAdapterManager().registerAdapters(adapterFactory, Mp3File.class); treeViewer.setLabelProvider(new WorkbenchLabelProvider()); treeViewer.setContentProvider(new TreeContentProvider(treeViewer)); treeViewer.setUseHashlookup(true); Mp3Directory root = new Mp3Directory("root"); File[] roots = File.listRoots(); for (File fileRoot : roots) { Mp3Directory mp3Root = new Mp3Directory(fileRoot.getAbsolutePath()); mp3Root.setFullPath(fileRoot.getAbsolutePath()); root.addMp3File(mp3Root); } treeViewer.setInput(root); treeViewer.setChildCount(root, roots.length); Mp3DoubleclickListener listener = new Mp3DoubleclickListener(); treeViewer.addDoubleClickListener(listener); } @Override public void dispose() { Platform.getAdapterManager().unregisterAdapters(adapterFactory); super.dispose(); } @Override public void setFocus() { treeViewer.getControl().setFocus(); } class Mp3DoubleclickListener implements IDoubleClickListener { public void doubleClick(DoubleClickEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); Mp3File source = ((Mp3File) selection.getFirstElement()); final String fullPath = source.getFullPath(); if (fullPath != null) { PathEditorInput pathEditorInput = new PathEditorInput(fullPath); String editorId = EditorFactory.getDefaultMp3EditorId(); try { getViewSite().getWorkbenchWindow().getActivePage().openEditor(pathEditorInput, editorId); } catch (Exception e) { LogUtil.logError("com.siemens.ct.mp3m.ui.views.physical", "cannot open editor with id: " + editorId); } } } } class TreeLabelProvider extends LabelProvider { @Override public String getText(Object element) { return ((Mp3File) element).getName(); } } class TreeContentProvider implements ILazyTreeContentProvider { class PrefetchModelJob extends Job { private final Mp3Directory mp3Dir; private final Mp3Directory parent; int index; int count; private final UIJob uiJob = new UIJob("Update UI") { @Override public IStatus runInUIThread(IProgressMonitor monitor) { if (treeViewer.getControl().isDisposed()) { return Status.CANCEL_STATUS; } // System.out.println("PrefetchModelUIJob: start: " + parent // + ":" + index); treeViewer.replace(parent, index, mp3Dir); treeViewer.setChildCount(mp3Dir, count); // System.out.println("PrefetchModelUIJob: end: " + parent // + ":" + index); return Status.OK_STATUS; } }; public PrefetchModelJob(String name, Mp3Directory parent, int index, Mp3Directory mp3Dir) { super(name); this.parent = parent; this.mp3Dir = mp3Dir; this.index = index; } @Override public IStatus run(IProgressMonitor monitor) { if (treeViewer.getControl().isDisposed()) { return Status.CANCEL_STATUS; } // System.out.println("PrefetchModelJob.run(): START: " + parent // + ":" + index); count = prefetchModel(mp3Dir); // Simulate long running operation /* * try { Thread.sleep(1000); } catch (InterruptedException e) { * // TODO Auto-generated catch block e.printStackTrace(); } */ uiJob.schedule(); // System.out.println("PrefetchModelJob.run(): END: "+ parent + // ":" + index); return Status.OK_STATUS; } }; private final TreeViewer treeViewer; public TreeContentProvider(TreeViewer treeViewer) { this.treeViewer = treeViewer; } public void updateChildCount(Object element, int currentChildCount) { } public int prefetchModel(Mp3Directory mp3Dir) { File dir = new File(mp3Dir.getFullPath()); File[] files = dir.listFiles(); int count = 0; if (files != null) { for (File file : files) { if (file.isDirectory() || file.getName().endsWith(".mp3")) { count += 1; Mp3File entry; if (file.isDirectory()) { entry = new Mp3Directory(file.getName()); } else { entry = new Mp3File(file.getName()); } entry.setFullPath(file.getAbsolutePath()); mp3Dir.addMp3File(entry); } } } mp3Dir.setContentsInitialized(true); return count; } public void updateElement(Object parent, int index) { Mp3Directory parentDir = (Mp3Directory) parent; Mp3File mp3File = parentDir.getMp3Files()[index]; int count = 0; if (mp3File instanceof Mp3Directory) { // count = prefetchModel((Mp3Directory) mp3File); PrefetchModelJob job = new PrefetchModelJob("Update Model", parentDir, index, (Mp3Directory) mp3File); job.schedule(); } treeViewer.replace(parent, index, mp3File); treeViewer.setChildCount(mp3File, count); } public void dispose() { } public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { treeViewer.getTree().setItemCount(0); } public Object getParent(Object element) { return null; } } }