| /******************************************************************************* |
| * Copyright (c) 2008, 2018 IBM Corporation and others. |
| * All rights reserved. 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.wst.sse.ui; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.Region; |
| import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel; |
| import org.eclipse.wst.sse.core.internal.provisional.IndexedRegion; |
| import org.eclipse.wst.sse.core.internal.provisional.text.ITextRegion; |
| |
| /** |
| * Responsible for converting between text ranges in a document and the domain |
| * objects covering that range, and determining the text ranges represented by |
| * domain objects. The domain objects handled are those used in structured |
| * selections and being sent across the selection service. |
| * |
| * Obtained as an adapter on the IStructuredModel |
| * |
| * @since 1.5 |
| */ |
| public class SelectionConverter { |
| /** |
| * @param model |
| * @param start |
| * @param end |
| * @return the most specific mapping of this text selection to domain |
| * objects |
| */ |
| public Object[] getElements(IStructuredModel model, int start, int end) { |
| Object[] localSelectedStructures = null; |
| if (model != null) { |
| IndexedRegion region = model.getIndexedRegion(start); |
| if (region != null) { |
| if (end <= region.getEndOffset()) { |
| // single selection |
| localSelectedStructures = new Object[1]; |
| localSelectedStructures[0] = region; |
| } |
| else { |
| // multiple selection |
| int maxLength = model.getStructuredDocument().getLength(); |
| List<IndexedRegion> structures = new ArrayList<>(2); |
| while (region != null && region.getEndOffset() <= end && region.getEndOffset() < maxLength) { |
| structures.add(region); |
| region = model.getIndexedRegion(region.getEndOffset() + 1); |
| } |
| localSelectedStructures = structures.toArray(); |
| } |
| } |
| } |
| if (localSelectedStructures == null) { |
| localSelectedStructures = new Object[0]; |
| } |
| return localSelectedStructures; |
| } |
| |
| /** |
| * @param o |
| * - a domain object being used in structured selections |
| * @return a {@link Region} containing the object's start and length, used |
| * for operations requiring the entire text span |
| */ |
| public IRegion getRegion(Object o) { |
| if (o instanceof ITextRegion) { |
| int start = ((ITextRegion) o).getStart(); |
| return new Region(start, ((ITextRegion) o).getEnd() - start); |
| } |
| else if (o instanceof IRegion) { |
| return new Region(((IRegion) o).getOffset(), ((IRegion) o).getLength()); |
| } |
| int startOffset = ((IndexedRegion) o).getStartOffset(); |
| return new Region(startOffset, ((IndexedRegion) o).getEndOffset() - startOffset); |
| } |
| |
| /** |
| * @param o |
| * - a domain object being used in structured selections |
| * @return a {@link Region} containing a start and length, used for |
| * operations where using the entire text span would be |
| * undesirable |
| */ |
| public IRegion getSelectionRegion(Object o) { |
| if (o instanceof ITextRegion) { |
| int start = ((ITextRegion) o).getStart(); |
| return new Region(start, 0); |
| } |
| else if (o instanceof IRegion) { |
| return new Region(((IRegion) o).getOffset(), 0); |
| } |
| int startOffset = ((IndexedRegion) o).getStartOffset(); |
| return new Region(startOffset, 0); |
| } |
| } |