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/*
* SonarQube
* Copyright (C) 2009-2018 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.api.batch.fs.internal;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import org.sonar.api.batch.ScannerSide;
import org.sonar.api.batch.fs.InputFile;
import org.sonar.api.batch.fs.internal.charhandler.CharHandler;
import org.sonar.api.batch.fs.internal.charhandler.FileHashComputer;
import org.sonar.api.batch.fs.internal.charhandler.LineCounter;
import org.sonar.api.batch.fs.internal.charhandler.LineHashComputer;
import org.sonar.api.batch.fs.internal.charhandler.LineOffsetCounter;
/**
* Computes hash of files. Ends of Lines are ignored, so files with
* same content but different EOL encoding have the same hash.
*/
@ScannerSide
@Immutable
public class FileMetadata {
private static final char LINE_FEED = '\n';
private static final char CARRIAGE_RETURN = '\r';
/**
* Compute hash of a file ignoring line ends differences.
* Maximum performance is needed.
*/
public Metadata readMetadata(InputStream stream, Charset encoding, String filePath, @Nullable CharHandler otherHandler) {
LineCounter lineCounter = new LineCounter(filePath, encoding);
FileHashComputer fileHashComputer = new FileHashComputer(filePath);
LineOffsetCounter lineOffsetCounter = new LineOffsetCounter();
if (otherHandler != null) {
CharHandler[] handlers = {lineCounter, fileHashComputer, lineOffsetCounter, otherHandler};
readFile(stream, encoding, filePath, handlers);
} else {
CharHandler[] handlers = {lineCounter, fileHashComputer, lineOffsetCounter};
readFile(stream, encoding, filePath, handlers);
}
return new Metadata(lineCounter.lines(), lineCounter.nonBlankLines(), fileHashComputer.getHash(), lineOffsetCounter.getOriginalLineOffsets(),
lineOffsetCounter.getLastValidOffset());
}
public Metadata readMetadata(InputStream stream, Charset encoding, String filePath) {
return readMetadata(stream, encoding, filePath, null);
}
/**
* For testing purpose
*/
public Metadata readMetadata(Reader reader) {
LineCounter lineCounter = new LineCounter("fromString", StandardCharsets.UTF_16);
FileHashComputer fileHashComputer = new FileHashComputer("fromString");
LineOffsetCounter lineOffsetCounter = new LineOffsetCounter();
CharHandler[] handlers = {lineCounter, fileHashComputer, lineOffsetCounter};
try {
read(reader, handlers);
} catch (IOException e) {
throw new IllegalStateException("Should never occur", e);
}
return new Metadata(lineCounter.lines(), lineCounter.nonBlankLines(), fileHashComputer.getHash(), lineOffsetCounter.getOriginalLineOffsets(),
lineOffsetCounter.getLastValidOffset());
}
public static void readFile(InputStream stream, Charset encoding, String filePath, CharHandler[] handlers) {
try (Reader reader = new BufferedReader(new InputStreamReader(stream, encoding))) {
read(reader, handlers);
} catch (IOException e) {
throw new IllegalStateException(String.format("Fail to read file '%s' with encoding '%s'", filePath, encoding), e);
}
}
private static void read(Reader reader, CharHandler[] handlers) throws IOException {
char c;
int i = reader.read();
boolean afterCR = false;
while (i != -1) {
c = (char) i;
if (afterCR) {
for (CharHandler handler : handlers) {
if (c == CARRIAGE_RETURN) {
handler.newLine();
handler.handleAll(c);
} else if (c == LINE_FEED) {
handler.handleAll(c);
handler.newLine();
} else {
handler.newLine();
handler.handleIgnoreEoL(c);
handler.handleAll(c);
}
}
afterCR = c == CARRIAGE_RETURN;
} else if (c == LINE_FEED) {
for (CharHandler handler : handlers) {
handler.handleAll(c);
handler.newLine();
}
} else if (c == CARRIAGE_RETURN) {
afterCR = true;
for (CharHandler handler : handlers) {
handler.handleAll(c);
}
} else {
for (CharHandler handler : handlers) {
handler.handleIgnoreEoL(c);
handler.handleAll(c);
}
}
i = reader.read();
}
for (CharHandler handler : handlers) {
if (afterCR) {
handler.newLine();
}
handler.eof();
}
}
@FunctionalInterface
public interface LineHashConsumer {
void consume(int lineIdx, @Nullable byte[] hash);
}
/**
* Compute a MD5 hash of each line of the file after removing of all blank chars
*/
public static void computeLineHashesForIssueTracking(InputFile f, LineHashConsumer consumer) {
try {
readFile(f.inputStream(), f.charset(), f.absolutePath(), new CharHandler[] {new LineHashComputer(consumer, f.file())});
} catch (IOException e) {
throw new IllegalStateException("Failed to compute line hashes for " + f.absolutePath(), e);
}
}
}
