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/*******************************************************************************
* Copyright (c) 2004, 2017 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.team.internal.core.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);
}
@Override
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)
*/
@Override
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);
try (BufferedReader br = new BufferedReader(new InputStreamReader(
trailingLineFeedDetector, encoding))) {
String line;
ArrayList<String> ar = new ArrayList<>();
while ((line = br.readLine()) != null) {
ar.add(line);
}
// 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 = ar.toArray(new String[ar.size()]);
}
}
String getLine(int ix) {
return fLines[ix];
}
@Override
public int getRangeCount() {
return fLines.length;
}
@Override
public boolean rangesEqual(int thisIndex, IRangeComparator other,
int otherIndex) {
String s1 = fLines[thisIndex];
String s2 = ((LineComparator) other).fLines[otherIndex];
return s1.equals(s2);
}
@Override
public boolean skipRangeComparison(int length, int maxLength,
IRangeComparator other) {
return false;
}
}
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