| /******************************************************************************* |
| * Copyright (c) 2000, 2010 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.ui.text; |
| |
| |
| import org.eclipse.jface.viewers.IStructuredSelection; |
| |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextViewer; |
| import org.eclipse.jface.text.Region; |
| import org.eclipse.jface.text.information.IInformationProvider; |
| import org.eclipse.jface.text.information.IInformationProviderExtension; |
| |
| import org.eclipse.ui.IEditorPart; |
| |
| import org.eclipse.jdt.core.IJavaElement; |
| import org.eclipse.jdt.core.ITypeParameter; |
| import org.eclipse.jdt.core.JavaModelException; |
| |
| import org.eclipse.jdt.internal.ui.actions.SelectionConverter; |
| import org.eclipse.jdt.internal.ui.javaeditor.EditorUtility; |
| import org.eclipse.jdt.internal.ui.javaeditor.JavaEditor; |
| |
| /** |
| * Provides a Java element to be displayed in by an information presenter. |
| */ |
| public class JavaElementProvider implements IInformationProvider, IInformationProviderExtension { |
| |
| private JavaEditor fEditor; |
| private boolean fUseCodeResolve; |
| |
| public JavaElementProvider(IEditorPart editor) { |
| fUseCodeResolve= false; |
| if (editor instanceof JavaEditor) |
| fEditor= (JavaEditor)editor; |
| } |
| |
| public JavaElementProvider(IEditorPart editor, boolean useCodeResolve) { |
| this(editor); |
| fUseCodeResolve= useCodeResolve; |
| } |
| |
| /* |
| * @see IInformationProvider#getSubject(ITextViewer, int) |
| */ |
| @Override |
| public IRegion getSubject(ITextViewer textViewer, int offset) { |
| if (textViewer != null && fEditor != null) { |
| IRegion region= JavaWordFinder.findWord(textViewer.getDocument(), offset); |
| if (region != null) |
| return region; |
| else |
| return new Region(offset, 0); |
| } |
| return null; |
| } |
| |
| /* |
| * @see IInformationProvider#getInformation(ITextViewer, IRegion) |
| */ |
| @Override |
| public String getInformation(ITextViewer textViewer, IRegion subject) { |
| return getInformation2(textViewer, subject).toString(); |
| } |
| |
| /* |
| * @see IInformationProviderExtension#getElement(ITextViewer, IRegion) |
| */ |
| @Override |
| public Object getInformation2(ITextViewer textViewer, IRegion subject) { |
| if (fEditor == null) |
| return null; |
| |
| try { |
| if (fUseCodeResolve) { |
| IStructuredSelection sel= SelectionConverter.getStructuredSelection(fEditor); |
| if (!sel.isEmpty()) { |
| Object element= sel.getFirstElement(); |
| if (!(element instanceof ITypeParameter)) |
| return element; |
| } |
| } |
| IJavaElement element= SelectionConverter.getElementAtOffset(fEditor, false); |
| if (element != null) |
| return element; |
| |
| return EditorUtility.getEditorInputJavaElement(fEditor, false); |
| } catch (JavaModelException e) { |
| return null; |
| } |
| } |
| } |