Java tutorial
/******************************************************************************* * Copyright (c) 2004, 2009 Tasktop Technologies 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: * Tasktop Technologies - initial API and implementation *******************************************************************************/ package org.eclipse.mylyn.internal.java.ui; import java.util.Iterator; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.Status; import org.eclipse.jdt.core.IImportContainer; import org.eclipse.jdt.core.IImportDeclaration; import org.eclipse.jdt.core.IJavaElement; import org.eclipse.jdt.core.IMethod; import org.eclipse.jdt.core.IPackageDeclaration; import org.eclipse.jdt.core.IType; 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.commons.core.StatusHandler; import org.eclipse.mylyn.internal.java.ui.search.JavaImplementorsProvider; import org.eclipse.mylyn.internal.java.ui.search.JavaReferencesProvider; import org.eclipse.mylyn.monitor.ui.AbstractUserInteractionMonitor; import org.eclipse.ui.IWorkbenchPart; /** * @author Mik Kersten */ public class JavaEditingMonitor extends AbstractUserInteractionMonitor { protected IJavaElement lastSelectedElement = null; protected IJavaElement lastResolvedElement = null; protected JavaEditor currentEditor; protected StructuredSelection currentSelection = null; public JavaEditingMonitor() { super(); } /** * Only public for testing. Note: Two sequential selections on the same element are deemed to be an edit of the * selection as this is the best guess that can be made. See bug 252306. */ @Override public void handleWorkbenchPartSelection(IWorkbenchPart part, ISelection selection, boolean contributeToContext) { try { IJavaElement selectedElement = null; if (selection instanceof StructuredSelection) { StructuredSelection structuredSelection = (StructuredSelection) selection; if (structuredSelection.equals(currentSelection)) { return; } currentSelection = structuredSelection; for (Iterator<?> iterator = structuredSelection.iterator(); iterator.hasNext();) { Object selectedObject = iterator.next(); if (selectedObject instanceof IJavaElement) { IJavaElement checkedElement = checkIfAcceptedAndPromoteIfNecessary( (IJavaElement) selectedObject); if (checkedElement == null) { return; } else { selectedElement = checkedElement; } } if (selectedElement != null) { super.handleElementSelection(part, selectedElement, contributeToContext); } } } else { if (selection instanceof TextSelection && part instanceof JavaEditor) { currentEditor = (JavaEditor) part; TextSelection textSelection = (TextSelection) selection; selectedElement = SelectionConverter.resolveEnclosingElement(currentEditor, textSelection); if (selectedElement instanceof IPackageDeclaration) { // HACK: ignoring these selections return; } IJavaElement[] resolved = SelectionConverter.codeResolve(currentEditor); if (resolved != null && resolved.length == 1 && !resolved[0].equals(selectedElement)) { lastResolvedElement = resolved[0]; } boolean selectionResolved = false; if (selectedElement instanceof IMethod && lastSelectedElement instanceof IMethod) { // navigation between two elements if (lastResolvedElement != null && lastSelectedElement != null && lastResolvedElement.equals(selectedElement) && !lastSelectedElement.equals(lastResolvedElement)) { super.handleNavigation(part, selectedElement, JavaReferencesProvider.ID, contributeToContext); selectionResolved = true; } else if (lastSelectedElement != null && lastSelectedElement.equals(lastResolvedElement) && !lastSelectedElement.equals(selectedElement)) { super.handleNavigation(part, selectedElement, JavaReferencesProvider.ID, contributeToContext); selectionResolved = true; } } else if (selectedElement != null && lastSelectedElement != null && !lastSelectedElement.equals(selectedElement)) { if (lastSelectedElement.getElementName().equals(selectedElement.getElementName())) { // navigation between two elements if (selectedElement instanceof IMethod && lastSelectedElement instanceof IMethod) { super.handleNavigation(part, selectedElement, JavaImplementorsProvider.ID, contributeToContext); selectionResolved = true; } else if (selectedElement instanceof IType && lastSelectedElement instanceof IType) { super.handleNavigation(part, selectedElement, JavaImplementorsProvider.ID, contributeToContext); selectionResolved = true; } } } if (selectedElement != null) { // selection of an element if (!selectionResolved && selectedElement.equals(lastSelectedElement)) { super.handleElementEdit(part, selectedElement, contributeToContext); } else if (!selectedElement.equals(lastSelectedElement)) { super.handleElementSelection(part, selectedElement, contributeToContext); } } IJavaElement checkedElement = checkIfAcceptedAndPromoteIfNecessary(selectedElement); if (checkedElement == null) { return; } else { selectedElement = checkedElement; } } } if (selectedElement != null) { lastSelectedElement = selectedElement; } } catch (JavaModelException e) { // ignore, fine to fail to resolve an element if the model is not up-to-date } catch (Throwable t) { StatusHandler.log(new Status(IStatus.ERROR, JavaUiBridgePlugin.ID_PLUGIN, "Failed to update model based on selection", t)); //$NON-NLS-1$ } } /** * @return null for elements that aren't modeled */ protected IJavaElement checkIfAcceptedAndPromoteIfNecessary(IJavaElement element) { // if (element instanceof IPackageDeclaration) return null; if (element instanceof IImportContainer) { return element.getParent(); } else if (element instanceof IImportDeclaration) { return element.getParent().getParent(); } else { return element; } } /** * For testing only. */ public void resetLastSelectedElement() { lastSelectedElement = null; } }