| /******************************************************************************* |
| * Copyright (c) 2004, 2006 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.team.internal.ui.mapping; |
| |
| import java.io.*; |
| import java.util.ArrayList; |
| import org.eclipse.compare.rangedifferencer.IRangeComparator; |
| import org.eclipse.core.resources.IEncodedStorage; |
| import org.eclipse.core.resources.IStorage; |
| import org.eclipse.core.runtime.CoreException; |
| |
| /** |
| * This implementation of IRangeComparator breaks an input stream into lines. |
| * Copied from org.eclipse.compare.internal.merge.LineComparator 1.4 and |
| * modified for {@link IStorage}. |
| */ |
| class LineComparator implements IRangeComparator { |
| |
| private String[] fLines; |
| |
| /* |
| * An input stream reader that detects a trailing LF in the wrapped stream. |
| */ |
| private static class TrailingLineFeedDetector extends FilterInputStream { |
| |
| boolean trailingLF = false; |
| |
| protected TrailingLineFeedDetector(InputStream in) { |
| super(in); |
| } |
| |
| public int read() throws IOException { |
| int c = super.read(); |
| trailingLF = isLineFeed(c); |
| return c; |
| } |
| |
| /* |
| * We don't need to override read(byte[] buffer) as the javadoc of |
| * FilterInputStream states that it will call read(byte[] buffer, int off, int len) |
| */ |
| public int read(byte[] buffer, int off, int len) throws IOException { |
| int length = super.read(buffer, off, len); |
| if (length != -1) { |
| int index = off + length - 1; |
| if (index >= buffer.length) |
| index = buffer.length - 1; |
| trailingLF = isLineFeed(buffer[index]); |
| } |
| return length; |
| } |
| |
| private boolean isLineFeed(int c) { |
| return c != -1 && c == '\n'; |
| } |
| |
| public boolean hadTrailingLineFeed() { |
| return trailingLF; |
| } |
| |
| } |
| |
| public static LineComparator create(IStorage storage, String outputEncoding) throws CoreException, IOException { |
| InputStream is = new BufferedInputStream(storage.getContents()); |
| try { |
| String encoding = getEncoding(storage, outputEncoding); |
| return new LineComparator(is, encoding); |
| } finally { |
| try { |
| is.close(); |
| } catch (IOException e) { |
| // Ignore |
| } |
| } |
| } |
| |
| private static String getEncoding(IStorage storage, String outputEncoding) throws CoreException { |
| if (storage instanceof IEncodedStorage) { |
| IEncodedStorage es = (IEncodedStorage) storage; |
| String charset = es.getCharset(); |
| if (charset != null) |
| return charset; |
| } |
| return outputEncoding; |
| } |
| |
| public LineComparator(InputStream is, String encoding) throws IOException { |
| |
| TrailingLineFeedDetector trailingLineFeedDetector = new TrailingLineFeedDetector(is); |
| BufferedReader br = new BufferedReader(new InputStreamReader(trailingLineFeedDetector, encoding)); |
| String line; |
| ArrayList ar = new ArrayList(); |
| while ((line = br.readLine()) != null) { |
| ar.add(line); |
| } |
| try { |
| is.close(); |
| } catch (IOException e1) { |
| } |
| // Add a trailing line if the last character in the file was a line feed. |
| // We do this because a BufferedReader doesn't distinguish the case |
| // where the last line has or doesn't have a trailing line separator |
| if (trailingLineFeedDetector.hadTrailingLineFeed()) { |
| ar.add(""); //$NON-NLS-1$ |
| } |
| fLines = (String[]) ar.toArray(new String[ar.size()]); |
| } |
| |
| String getLine(int ix) { |
| return fLines[ix]; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.compare.rangedifferencer.IRangeComparator#getRangeCount() |
| */ |
| public int getRangeCount() { |
| return fLines.length; |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.compare.rangedifferencer.IRangeComparator#rangesEqual(int, org.eclipse.compare.rangedifferencer.IRangeComparator, int) |
| */ |
| public boolean rangesEqual(int thisIndex, IRangeComparator other, |
| int otherIndex) { |
| String s1 = fLines[thisIndex]; |
| String s2 = ((LineComparator) other).fLines[otherIndex]; |
| return s1.equals(s2); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.eclipse.compare.rangedifferencer.IRangeComparator#skipRangeComparison(int, int, org.eclipse.compare.rangedifferencer.IRangeComparator) |
| */ |
| public boolean skipRangeComparison(int length, int maxLength, IRangeComparator other) { |
| return false; |
| } |
| } |