Java tutorial
/******************************************************************************* * Copyright (c) 2004 - 2006 University Of British Columbia 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 * * Contributors: * University Of British Columbia - initial API and implementation *******************************************************************************/ /* * Created on Jun 10, 2005 */ package org.eclipse.mylyn.internal.monitor.monitors; import org.eclipse.core.resources.IFile; import org.eclipse.core.resources.IResource; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.JavaModelException; import org.eclipse.jdt.internal.ui.actions.SelectionConverter; import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor; import org.eclipse.jface.text.TextSelection; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.mylyn.internal.core.MylarContextManager; import org.eclipse.mylyn.internal.monitor.HandleObfuscator; import org.eclipse.mylyn.provisional.core.AbstractUserInteractionMonitor; import org.eclipse.mylyn.provisional.core.IMylarElement; import org.eclipse.mylyn.provisional.core.InteractionEvent; import org.eclipse.mylyn.provisional.core.MylarPlugin; import org.eclipse.ui.IEditorInput; import org.eclipse.ui.IPathEditorInput; import org.eclipse.ui.IWorkbenchPart; import org.eclipse.ui.part.EditorPart; /** * Limited to Java selections. * * @author Mik Kersten */ public class SelectionMonitor extends AbstractUserInteractionMonitor { private static final String ID_JAVA_UNKNOWN = "(non-source element)"; public static final String SELECTION_DEFAULT = "selected"; public static final String SELECTION_NEW = "new"; public static final String SELECTION_DECAYED = "decayed"; public static final String SELECTION_PREDICTED = "predicted"; private static final Object ID_JAVA_UNKNOW_OLD = "(non-existing element)"; private IJavaElement lastSelectedElement = null; private HandleObfuscator obfuscator = new HandleObfuscator(); @Override protected void handleWorkbenchPartSelection(IWorkbenchPart part, ISelection selection) { // ignored, since not using context monitoring facilities } @Override public void selectionChanged(IWorkbenchPart part, ISelection selection) { String structureKind = InteractionEvent.ID_UNKNOWN; String obfuscatedElementHandle = InteractionEvent.ID_UNKNOWN; String elementHandle = InteractionEvent.ID_UNKNOWN; InteractionEvent.Kind interactionKind = InteractionEvent.Kind.SELECTION; if (selection instanceof StructuredSelection) { StructuredSelection structuredSelection = (StructuredSelection) selection; Object selectedObject = structuredSelection.getFirstElement(); if (selectedObject == null) return; if (selectedObject instanceof IJavaElement) { IJavaElement javaElement = (IJavaElement) selectedObject; structureKind = "java:" + javaElement.getClass(); elementHandle = javaElement.getHandleIdentifier(); obfuscatedElementHandle = obfuscateJavaElementHandle(javaElement); lastSelectedElement = javaElement; } else { structureKind = InteractionEvent.ID_UNKNOWN + ": " + selectedObject.getClass(); if (selectedObject instanceof IAdaptable) { IResource resource = (IResource) ((IAdaptable) selectedObject).getAdapter(IResource.class); if (resource != null) { obfuscatedElementHandle = obfuscator .obfuscateResourcePath(resource.getProjectRelativePath()); } } } } else { if (selection instanceof TextSelection && part instanceof JavaEditor) { TextSelection textSelection = (TextSelection) selection; IJavaElement javaElement; try { javaElement = SelectionConverter.resolveEnclosingElement((JavaEditor) part, textSelection); if (javaElement != null) { structureKind = "java:" + javaElement.getClass(); obfuscatedElementHandle = obfuscateJavaElementHandle(javaElement); elementHandle = javaElement.getHandleIdentifier(); if (javaElement != null && javaElement.equals(lastSelectedElement)) { interactionKind = InteractionEvent.Kind.EDIT; } lastSelectedElement = javaElement; } } catch (JavaModelException e) { // ignore unresolved elements } } else if (part instanceof EditorPart) { EditorPart editorPart = (EditorPart) part; IEditorInput input = editorPart.getEditorInput(); if (input instanceof IPathEditorInput) { structureKind = "file"; obfuscatedElementHandle = obfuscator .obfuscateResourcePath(((IPathEditorInput) input).getPath()); } } } IMylarElement node = ContextCorePlugin.getContextManager().getElement(elementHandle); String delta = ""; float selectionFactor = MylarContextManager.getScalingFactors().get(InteractionEvent.Kind.SELECTION) .getValue(); // XXX: broken in 0.4? if (node != null) { if (node.getInterest().getEncodedValue() <= selectionFactor && node.getInterest().getValue() > selectionFactor) { delta = SELECTION_PREDICTED; } else if (node.getInterest().getEncodedValue() < selectionFactor && node.getInterest().getDecayValue() > selectionFactor) { delta = SELECTION_DECAYED; } else if (node.getInterest().getValue() == selectionFactor && node.getInterest().getDecayValue() < selectionFactor) { delta = SELECTION_NEW; } else { delta = SELECTION_DEFAULT; } } InteractionEvent event = new InteractionEvent(interactionKind, structureKind, obfuscatedElementHandle, part.getSite().getId(), "null", delta, 0); ContextCore.notifyInteractionObserved(event); } private String obfuscateJavaElementHandle(IJavaElement javaElement) { try { StringBuffer obfuscatedPath = new StringBuffer(); IResource resource; resource = (IResource) javaElement.getUnderlyingResource(); if (resource != null && (resource instanceof IFile)) { IFile file = (IFile) resource; obfuscatedPath.append(obfuscator.obfuscateResourcePath(file.getProjectRelativePath())); obfuscatedPath.append(':'); obfuscatedPath.append(obfuscator.obfuscateString(javaElement.getElementName())); return obfuscatedPath.toString(); } else { return obfuscator.obfuscateString(javaElement.getHandleIdentifier()); } } catch (JavaModelException e) { // ignore non-existing element } return ID_JAVA_UNKNOWN; } /** * Some events do not have a valid handle, e.g. hande is null or ? */ public static boolean isValidStructureHandle(InteractionEvent event) { String handle = event.getStructureHandle(); return handle != null && !handle.trim().equals("") && !handle.equals(SelectionMonitor.ID_JAVA_UNKNOWN) && !handle.equals(SelectionMonitor.ID_JAVA_UNKNOW_OLD) && event.isValidStructureHandle(); } }