| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jface.text.projection; |
| |
| |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextStore; |
| import org.eclipse.jface.text.Region; |
| |
| |
| /** |
| * A text store representing the projection defined by the given document |
| * information mapping. |
| * |
| * @since 3.0 |
| */ |
| class ProjectionTextStore implements ITextStore { |
| |
| /** |
| * Implementation of {@link IRegion} that can be reused |
| * by setting the offset and the length. |
| */ |
| private static class ReusableRegion implements IRegion { |
| |
| private int fOffset; |
| private int fLength; |
| |
| /* |
| * @see org.eclipse.jface.text.IRegion#getLength() |
| */ |
| public int getLength() { |
| return fLength; |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.IRegion#getOffset() |
| */ |
| public int getOffset() { |
| return fOffset; |
| } |
| |
| /** |
| * Updates this region. |
| * |
| * @param offset the new offset |
| * @param length the new length |
| */ |
| public void update(int offset, int length) { |
| fOffset= offset; |
| fLength= length; |
| } |
| } |
| |
| /** The master document */ |
| private IDocument fMasterDocument; |
| /** The document information mapping */ |
| private IMinimalMapping fMapping; |
| /** Internal region used for querying the mapping. */ |
| private ReusableRegion fReusableRegion= new ReusableRegion(); |
| |
| |
| /** |
| * Creates a new projection text store for the given master document and |
| * the given document information mapping. |
| * |
| * @param masterDocument the master document |
| * @param mapping the document information mapping |
| */ |
| public ProjectionTextStore(IDocument masterDocument, IMinimalMapping mapping) { |
| fMasterDocument= masterDocument; |
| fMapping= mapping; |
| } |
| |
| private void internalError() { |
| throw new IllegalStateException(); |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.ITextStore#set(java.lang.String) |
| */ |
| public void set(String contents) { |
| |
| IRegion masterRegion= fMapping.getCoverage(); |
| if (masterRegion == null) |
| internalError(); |
| |
| try { |
| fMasterDocument.replace(masterRegion.getOffset(), masterRegion.getLength(), contents); |
| } catch (BadLocationException e) { |
| internalError(); |
| } |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.ITextStore#replace(int, int, java.lang.String) |
| */ |
| public void replace(int offset, int length, String text) { |
| fReusableRegion.update(offset, length); |
| try { |
| IRegion masterRegion= fMapping.toOriginRegion(fReusableRegion); |
| fMasterDocument.replace(masterRegion.getOffset(), masterRegion.getLength(), text); |
| } catch (BadLocationException e) { |
| internalError(); |
| } |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.ITextStore#getLength() |
| */ |
| public int getLength() { |
| return fMapping.getImageLength(); |
| } |
| |
| /* |
| * @see org.eclipse.jface.text.ITextStore#get(int) |
| */ |
| public char get(int offset) { |
| try { |
| int originOffset= fMapping.toOriginOffset(offset); |
| return fMasterDocument.getChar(originOffset); |
| } catch (BadLocationException e) { |
| internalError(); |
| } |
| |
| // unreachable |
| return (char) 0; |
| } |
| |
| /* |
| * @see ITextStore#get(int, int) |
| */ |
| public String get(int offset, int length) { |
| try { |
| IRegion[] fragments= fMapping.toExactOriginRegions(new Region(offset, length)); |
| StringBuffer buffer= new StringBuffer(); |
| for (int i= 0; i < fragments.length; i++) { |
| IRegion fragment= fragments[i]; |
| buffer.append(fMasterDocument.get(fragment.getOffset(), fragment.getLength())); |
| } |
| return buffer.toString(); |
| } catch (BadLocationException e) { |
| internalError(); |
| } |
| |
| // unreachable |
| return null; |
| } |
| } |