tikhomirov@586: /*
tikhomirov@586:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@586:  *  
tikhomirov@586:  * This program is free software; you can redistribute it and/or modify
tikhomirov@586:  * it under the terms of the GNU General Public License as published by
tikhomirov@586:  * the Free Software Foundation; version 2 of the License.
tikhomirov@586:  *
tikhomirov@586:  * This program is distributed in the hope that it will be useful,
tikhomirov@586:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@586:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@586:  * GNU General Public License for more details.
tikhomirov@586:  *
tikhomirov@586:  * For information on how to redistribute this software under
tikhomirov@586:  * the terms of a license other than GNU General Public License
tikhomirov@586:  * contact TMate Software at support@hg4j.com
tikhomirov@586:  */
tikhomirov@586: package org.tmatesoft.hg.internal;
tikhomirov@586: 
tikhomirov@586: import java.io.File;
tikhomirov@586: import java.io.FileInputStream;
tikhomirov@586: import java.io.FileNotFoundException;
tikhomirov@586: import java.io.IOException;
tikhomirov@586: import java.nio.ByteBuffer;
tikhomirov@586: import java.nio.channels.FileChannel;
tikhomirov@586: 
tikhomirov@586: import org.tmatesoft.hg.core.HgIOException;
tikhomirov@586: import org.tmatesoft.hg.repo.CommitFacility;
tikhomirov@586: import org.tmatesoft.hg.repo.HgRepository;
tikhomirov@586: import org.tmatesoft.hg.util.Path;
tikhomirov@586: 
tikhomirov@586: /**
tikhomirov@586:  * FIXME files are opened at the moment of instantiation, though the moment the data is requested might be distant
tikhomirov@586:  * 
tikhomirov@586:  * @author Artem Tikhomirov
tikhomirov@586:  * @author TMate Software Ltd.
tikhomirov@586:  */
tikhomirov@586: public class FileContentSupplier implements CommitFacility.ByteDataSupplier {
tikhomirov@586: 	private final FileChannel channel;
tikhomirov@586: 	private IOException error;
tikhomirov@586: 	
tikhomirov@586: 	public FileContentSupplier(HgRepository repo, Path file) throws HgIOException {
tikhomirov@586: 		this(new File(repo.getWorkingDir(), file.toString()));
tikhomirov@586: 	}
tikhomirov@586: 
tikhomirov@586: 	public FileContentSupplier(File f) throws HgIOException {
tikhomirov@586: 		if (!f.canRead()) {
tikhomirov@586: 			throw new HgIOException(String.format("Can't read file %s", f), f);
tikhomirov@586: 		}
tikhomirov@586: 		try {
tikhomirov@586: 			channel = new FileInputStream(f).getChannel();
tikhomirov@586: 		} catch (FileNotFoundException ex) {
tikhomirov@586: 			throw new HgIOException("Can't open file", ex, f);
tikhomirov@586: 		}
tikhomirov@586: 	}
tikhomirov@586: 
tikhomirov@586: 	public int read(ByteBuffer buf) {
tikhomirov@586: 		if (error != null) {
tikhomirov@586: 			return -1;
tikhomirov@586: 		}
tikhomirov@586: 		try {
tikhomirov@586: 			return channel.read(buf);
tikhomirov@586: 		} catch (IOException ex) {
tikhomirov@586: 			error = ex;
tikhomirov@586: 		}
tikhomirov@586: 		return -1;
tikhomirov@586: 	}
tikhomirov@586: 	
tikhomirov@586: 	public void done() throws IOException {
tikhomirov@586: 		channel.close();
tikhomirov@586: 		if (error != null) {
tikhomirov@586: 			throw error;
tikhomirov@586: 		}
tikhomirov@586: 	}
tikhomirov@586: }