| /******************************************************************************* |
| * Copyright (c) 2001, 2004 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 |
| * Jens Lukowski/Innoopract - initial renaming/restructuring |
| * |
| *******************************************************************************/ |
| package org.eclipse.wst.sse.core.internal.document; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| import org.eclipse.jface.text.IDocument; |
| |
| /** |
| * A java.io.Reader that can operate off of an IDocument. |
| */ |
| public class DocumentReader extends Reader { |
| private IDocument fDocument = null; |
| private int mark = 0; |
| private int position = 0; |
| |
| public DocumentReader() { |
| super(); |
| } |
| |
| public DocumentReader(IDocument document) { |
| this(document, 0); |
| } |
| |
| public DocumentReader(IDocument document, int initialPosition) { |
| super(); |
| fDocument = document; |
| position = initialPosition; |
| } |
| |
| public void close() throws IOException { |
| // do nothing for a 'document' |
| } |
| |
| /** |
| * @return |
| */ |
| public IDocument getDocument() { |
| return fDocument; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.io.Reader#mark(int) |
| */ |
| public void mark(int readAheadLimit) throws IOException { |
| mark = position; |
| } |
| |
| public boolean markSupported() { |
| return true; |
| } |
| |
| public int read(char[] cbuf, int off, int len) throws IOException { |
| char[] readChars = null; |
| try { |
| if (position >= fDocument.getLength()) |
| return -1; |
| // the IDocument is likely using a GapTextStore, so we can't |
| // retrieve a char[] directly |
| if (position + len > fDocument.getLength()) |
| readChars = fDocument.get(position, fDocument.getLength() - position).toCharArray(); |
| else |
| readChars = fDocument.get(position, len).toCharArray(); |
| System.arraycopy(readChars, 0, cbuf, off, readChars.length); |
| // System.out.println("" + position + ":" + readChars.length + " " |
| // + StringUtils.escape(new String(readChars))); |
| position += readChars.length; |
| return readChars.length; |
| } catch (Exception e) { |
| throw new IOException("Exception while reading from IDocument: " + e); //$NON-NLS-1$ |
| } |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.io.Reader#reset() |
| */ |
| public void reset() throws IOException { |
| position = mark; |
| } |
| |
| public void reset(IDocument document, int initialPosition) { |
| fDocument = document; |
| position = initialPosition; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.io.Reader#reset() |
| */ |
| public void reset(int pos) throws IOException { |
| position = pos; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see java.io.Reader#skip(long) |
| */ |
| public long skip(long n) throws IOException { |
| long skipped = n; |
| if (position + n > fDocument.getLength()) { |
| skipped = fDocument.getLength() - position; |
| position = fDocument.getLength(); |
| } else { |
| position += n; |
| } |
| return skipped; |
| } |
| } |