tikhomirov@617: /*
tikhomirov@617:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@617:  *  
tikhomirov@617:  * This program is free software; you can redistribute it and/or modify
tikhomirov@617:  * it under the terms of the GNU General Public License as published by
tikhomirov@617:  * the Free Software Foundation; version 2 of the License.
tikhomirov@617:  *
tikhomirov@617:  * This program is distributed in the hope that it will be useful,
tikhomirov@617:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@617:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@617:  * GNU General Public License for more details.
tikhomirov@617:  *
tikhomirov@617:  * For information on how to redistribute this software under
tikhomirov@617:  * the terms of a license other than GNU General Public License
tikhomirov@617:  * contact TMate Software at support@hg4j.com
tikhomirov@617:  */
tikhomirov@617: package org.tmatesoft.hg.internal;
tikhomirov@617: 
tikhomirov@617: import static org.tmatesoft.hg.util.LogFacility.Severity.Debug;
tikhomirov@617: 
tikhomirov@617: import java.io.Closeable;
tikhomirov@617: import java.io.File;
tikhomirov@617: import java.io.FileInputStream;
tikhomirov@617: import java.io.FileOutputStream;
tikhomirov@617: import java.io.IOException;
tikhomirov@697: import java.io.InputStream;
tikhomirov@617: import java.nio.channels.FileChannel;
tikhomirov@617: 
tikhomirov@617: import org.tmatesoft.hg.core.HgIOException;
tikhomirov@617: import org.tmatesoft.hg.util.LogFacility;
tikhomirov@617: import org.tmatesoft.hg.util.LogFacility.Severity;
tikhomirov@617: 
tikhomirov@617: /**
tikhomirov@617:  * 
tikhomirov@617:  * @author Artem Tikhomirov
tikhomirov@617:  * @author TMate Software Ltd.
tikhomirov@617:  */
tikhomirov@619: public final class FileUtils {
tikhomirov@617: 	
tikhomirov@617: 	private final LogFacility log;
tikhomirov@654: 	private final Class<?> troublemaker;
tikhomirov@617: 	
tikhomirov@617: 	public static void copyFile(File from, File to) throws HgIOException {
tikhomirov@654: 		new FileUtils(new StreamLogFacility(Debug, true, System.err), FileUtils.class).copy(from, to);
tikhomirov@617: 	}
tikhomirov@617: 
tikhomirov@654: 	public FileUtils(LogFacility logFacility, Object troubleSource) {
tikhomirov@617: 		log = logFacility;
tikhomirov@654: 		if (troubleSource == null) {
tikhomirov@654: 			troublemaker = null;
tikhomirov@654: 		} else {
tikhomirov@654: 			troublemaker = troubleSource instanceof Class ? (Class<?>) troubleSource : troubleSource.getClass();
tikhomirov@654: 		}
tikhomirov@617: 	}
tikhomirov@617: 
tikhomirov@617: 	public void copy(File from, File to) throws HgIOException {
tikhomirov@617: 		FileInputStream fis = null;
tikhomirov@617: 		FileOutputStream fos = null;
tikhomirov@617: 		try {
tikhomirov@617: 			fis = new FileInputStream(from);
tikhomirov@617: 			fos = new FileOutputStream(to);
tikhomirov@617: 			FileChannel input = fis.getChannel();
tikhomirov@617: 			FileChannel output = fos.getChannel();
tikhomirov@617: 			long count = input.size();
tikhomirov@617: 			long pos = 0;
tikhomirov@617: 			int zeroCopied = 0; // flag to prevent hang-up
tikhomirov@617: 			do {
tikhomirov@617: 				long c = input.transferTo(pos, count, output);
tikhomirov@617: 				pos += c;
tikhomirov@617: 				count -= c;
tikhomirov@617: 				if (c == 0) {
tikhomirov@617: 					if (++zeroCopied == 3) {
tikhomirov@617: 						String m = String.format("Can't copy %s to %s, transferTo copies 0 bytes. Position: %d, bytes left:%d", from.getName(), to.getName(), pos, count);
tikhomirov@617: 						throw new IOException(m);
tikhomirov@617: 					}
tikhomirov@617: 				} else {
tikhomirov@617: 					// reset
tikhomirov@617: 					zeroCopied = 0;
tikhomirov@617: 				}
tikhomirov@617: 			} while (count > 0);
tikhomirov@617: 			fos.close();
tikhomirov@617: 			fos = null;
tikhomirov@617: 			fis.close();
tikhomirov@617: 			fis = null;
tikhomirov@617: 		} catch (IOException ex) {
tikhomirov@617: 			// not in finally because I don't want to loose exception from fos.close()
tikhomirov@636: 			closeQuietly(fis, from);
tikhomirov@636: 			closeQuietly(fos, to);
tikhomirov@617: 			String m = String.format("Failed to copy %s to %s", from.getName(), to.getName());
tikhomirov@617: 			throw new HgIOException(m, ex, from);
tikhomirov@617: 		}
tikhomirov@624: 		/* Copy of cpython's 00changelog.d, 20Mb+
tikhomirov@624: 		 * Linux&Windows: 300-400 ms,
tikhomirov@624: 		 * Windows uncached run: 1.6 seconds
tikhomirov@624: 		 */
tikhomirov@617: 	}
tikhomirov@697: 	
tikhomirov@697: 	public void write(InputStream is, File file) throws IOException {
tikhomirov@697: 		FileOutputStream fos = new FileOutputStream(file);
tikhomirov@697: 		int r;
tikhomirov@697: 		byte[] buf = new byte[8*1024];
tikhomirov@697: 		while ((r = is.read(buf)) != -1) {
tikhomirov@697: 			fos.write(buf, 0, r);
tikhomirov@697: 		}
tikhomirov@697: 		fos.flush();
tikhomirov@697: 		fos.close();
tikhomirov@697: 	}
tikhomirov@705: 	
tikhomirov@617: 	public void closeQuietly(Closeable stream) {
tikhomirov@636: 		closeQuietly(stream, null);
tikhomirov@636: 	}
tikhomirov@636: 
tikhomirov@636: 	public void closeQuietly(Closeable stream, File f) {
tikhomirov@617: 		if (stream != null) {
tikhomirov@617: 			try {
tikhomirov@617: 				stream.close();
tikhomirov@617: 			} catch (IOException ex) {
tikhomirov@617: 				// ignore
tikhomirov@636: 				final String msg;
tikhomirov@636: 				if (f == null) {
tikhomirov@636: 					msg = "Exception while closing stream quietly";
tikhomirov@636: 				} else {
tikhomirov@636: 					msg = String.format("Failed to close %s", f);
tikhomirov@636: 				}
tikhomirov@654: 				log.dump(troublemaker == null ? getClass() : troublemaker, Severity.Warn, ex, msg);
tikhomirov@617: 			}
tikhomirov@617: 		}
tikhomirov@617: 	}
tikhomirov@705: 
tikhomirov@705: 	// nothing special, just a single place with common prefix
tikhomirov@705: 	public File createTempFile() throws IOException {
tikhomirov@705: 		return File.createTempFile("hg4j-", null);
tikhomirov@705: 	}
tikhomirov@617: }