Java tutorial
/******************************************************************************* * Copyright (c) 2015 itemis AG (http://www.itemis.eu) and others. * 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 *******************************************************************************/ package org.eclipse.xtext.builder.trace; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IStorage; import org.eclipse.emf.common.util.URI; import org.eclipse.emf.ecore.EObject; import org.eclipse.emf.ecore.presentation.EcoreEditor; import org.eclipse.emf.ecore.resource.Resource; import org.eclipse.jface.resource.JFaceResources; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.swt.SWT; import org.eclipse.swt.custom.StyledText; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Sash; import org.eclipse.xtext.EcoreUtil2; import org.eclipse.xtext.generator.trace.AbstractTraceRegion; import org.eclipse.xtext.generator.trace.ITraceRegionProvider; import org.eclipse.xtext.generator.trace.SourceRelativeURI; import org.eclipse.xtext.generator.trace.TraceFileNameProvider; import org.eclipse.xtext.generator.trace.TraceNotFoundException; import org.eclipse.xtext.resource.IResourceServiceProvider; import org.eclipse.xtext.resource.IResourceServiceProvider.Registry; import org.eclipse.xtext.ui.generator.trace.StorageAwareTrace; import org.eclipse.xtext.ui.resource.IStorage2UriMapper; import org.eclipse.xtext.util.Pair; import com.google.common.base.Throwables; /** * @author Moritz Eysholdt - Initial contribution and API */ public class TraceEditor extends EcoreEditor { private StyledText text; @Override protected Composite createPageContainer(final Composite parent) { Composite tree = new Composite(parent, SWT.NONE); final Sash sash = new Sash(parent, SWT.HORIZONTAL); text = new StyledText(parent, SWT.READ_ONLY | SWT.V_SCROLL | SWT.H_SCROLL); text.setFont(JFaceResources.getTextFont()); final FormLayout form = new FormLayout(); parent.setLayout(form); FormData treeData = new FormData(); treeData.left = new FormAttachment(0, 0); treeData.right = new FormAttachment(100, 0); treeData.top = new FormAttachment(0, 0); treeData.bottom = new FormAttachment(sash, 0); tree.setLayoutData(treeData); final int limit = 20, percent = 50; final FormData sashData = new FormData(); sashData.left = new FormAttachment(0, 0); sashData.top = new FormAttachment(percent, 0); sashData.right = new FormAttachment(100, 0); sash.setLayoutData(sashData); sash.addListener(SWT.Selection, new Listener() { @Override public void handleEvent(Event e) { Rectangle sashRect = sash.getBounds(); Rectangle parentRect = parent.getClientArea(); int bottom = parentRect.height - sashRect.height - limit; e.y = Math.max(Math.min(e.y, bottom), limit); if (e.y != sashRect.y) { sashData.top = new FormAttachment(0, e.y); parent.layout(); } } }); FormData textData = new FormData(); textData.left = new FormAttachment(0, 0); textData.right = new FormAttachment(100, 0); textData.top = new FormAttachment(sash, 0); textData.bottom = new FormAttachment(100, 0); text.setLayoutData(textData); addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { ISelection selection = event.getSelection(); if (selection instanceof IStructuredSelection) { try { Object x = ((IStructuredSelection) selection).getFirstElement(); if (x instanceof EObject) updateText((EObject) x); if (x instanceof Resource) updateText(((Resource) x).getContents().get(0)); } catch (Exception e) { text.setText(Throwables.getStackTraceAsString(e)); } } } }); return tree; } protected IStorage getLocalStorage(IResourceServiceProvider serviceProvider, URI traceURI) { TraceFileNameProvider fileNameProvider = serviceProvider.get(TraceFileNameProvider.class); IStorage2UriMapper storage2UriMapper = serviceProvider.get(IStorage2UriMapper.class); String generatedName = fileNameProvider.getJavaFromTrace(traceURI.lastSegment()); URI generatedURI = traceURI.trimSegments(1).appendSegment(generatedName); for (Pair<IStorage, IProject> x : storage2UriMapper.getStorages(generatedURI)) return x.getFirst(); throw new IllegalStateException("Could not find IStorage for " + generatedURI); } protected void updateText(EObject obj) { DebugTraceRegion region = EcoreUtil2.getContainerOfType(obj, DebugTraceRegion.class); if (region == null) { text.setText("No " + DebugTraceRegion.class.getSimpleName() + " found for " + obj.eClass().getName()); return; } final DebugTraceBasedRegion trace = new DebugTraceBasedRegion(null, region); SourceRelativeURI sourceURI = trace.getAssociatedSrcRelativePath(); if (sourceURI == null) { text.setText("Could not find associated URI"); return; } Registry registry = IResourceServiceProvider.Registry.INSTANCE; IResourceServiceProvider serviceProvider = registry.getResourceServiceProvider(sourceURI.getURI()); URI traceURI = obj.eResource().getURI(); IStorage localStorage = getLocalStorage(serviceProvider, traceURI); StorageAwareTrace traceProvider = serviceProvider.get(StorageAwareTrace.class); traceProvider.setLocalStorage(localStorage); traceProvider.setTraceToSource(true); traceProvider.setTraceRegionProvider(new ITraceRegionProvider() { @Override public AbstractTraceRegion getTraceRegion() throws TraceNotFoundException { return trace; } }); String newText = traceProvider.toString(); text.setText(newText); } }