tikhomirov@618: /*
tikhomirov@618:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@618:  *  
tikhomirov@618:  * This program is free software; you can redistribute it and/or modify
tikhomirov@618:  * it under the terms of the GNU General Public License as published by
tikhomirov@618:  * the Free Software Foundation; version 2 of the License.
tikhomirov@618:  *
tikhomirov@618:  * This program is distributed in the hope that it will be useful,
tikhomirov@618:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@618:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@618:  * GNU General Public License for more details.
tikhomirov@618:  *
tikhomirov@618:  * For information on how to redistribute this software under
tikhomirov@618:  * the terms of a license other than GNU General Public License
tikhomirov@618:  * contact TMate Software at support@hg4j.com
tikhomirov@618:  */
tikhomirov@618: package org.tmatesoft.hg.internal;
tikhomirov@618: 
tikhomirov@618: import java.io.File;
tikhomirov@618: import java.io.IOException;
tikhomirov@618: import java.nio.ByteBuffer;
tikhomirov@618: 
tikhomirov@618: import org.tmatesoft.hg.core.HgCommitCommand;
tikhomirov@618: import org.tmatesoft.hg.core.HgIOException;
tikhomirov@618: import org.tmatesoft.hg.repo.HgDataFile;
tikhomirov@618: import org.tmatesoft.hg.repo.HgInvalidFileException;
tikhomirov@618: import org.tmatesoft.hg.repo.HgInvalidStateException;
tikhomirov@618: import org.tmatesoft.hg.repo.HgRepository;
tikhomirov@618: import org.tmatesoft.hg.util.ByteChannel;
tikhomirov@618: import org.tmatesoft.hg.util.CancelledException;
tikhomirov@618: 
tikhomirov@618: /**
tikhomirov@618:  * Access content of the working copy. The difference with {@link FileContentSupplier} is that this one doesn't need {@link File}
tikhomirov@618:  * in the working directory. However, provided this class is used from {@link HgCommitCommand} when "modified" file was detected,
tikhomirov@618:  * it's odd to expect no file in the working dir.
tikhomirov@618:  * 
tikhomirov@618:  * @author Artem Tikhomirov
tikhomirov@618:  * @author TMate Software Ltd.
tikhomirov@618:  */
tikhomirov@618: public class WorkingCopyContent implements DataSerializer.DataSource {
tikhomirov@618: 	private final HgDataFile file;
tikhomirov@618: 
tikhomirov@618: 	public WorkingCopyContent(HgDataFile dataFile) {
tikhomirov@618: 		file = dataFile;
tikhomirov@618: 		if (!dataFile.exists()) {
tikhomirov@618: 			throw new IllegalArgumentException();
tikhomirov@618: 		}
tikhomirov@618: 	}
tikhomirov@618: 
tikhomirov@618: 	public void serialize(final DataSerializer out) throws HgIOException {
tikhomirov@618: 		final HgIOException failure[] = new HgIOException[1];
tikhomirov@618: 		try {
tikhomirov@618: 			// TODO #workingCopy API is very limiting, CancelledException is inconvenient, 
tikhomirov@618: 			// and absence of HgIOException is very uncomfortable
tikhomirov@618: 			file.workingCopy(new ByteChannel() {
tikhomirov@618: 				
tikhomirov@618: 				public int write(ByteBuffer buffer) throws IOException {
tikhomirov@618: 					try {
tikhomirov@618: 						if (buffer.hasArray()) {
tikhomirov@618: 							out.write(buffer.array(), buffer.position(), buffer.remaining());
tikhomirov@618: 						}
tikhomirov@618: 						int rv = buffer.remaining();
tikhomirov@618: 						buffer.position(buffer.limit()); // pretend we've consumed the data
tikhomirov@618: 						return rv;
tikhomirov@618: 					} catch (HgIOException ex) {
tikhomirov@618: 						failure[0] = ex;
tikhomirov@618: 						throw new IOException(ex);
tikhomirov@618: 					}
tikhomirov@618: 				}
tikhomirov@618: 			});
tikhomirov@618: 		} catch (HgInvalidFileException ex) {
tikhomirov@618: 			if (failure[0] != null) {
tikhomirov@618: 				throw failure[0];
tikhomirov@618: 			}
tikhomirov@618: 			throw new HgIOException("Write failure", ex, new File(file.getRepo().getWorkingDir(), file.getPath().toString()));
tikhomirov@618: 		} catch (CancelledException ex) {
tikhomirov@618: 			throw new HgInvalidStateException("Our channel doesn't cancel here");
tikhomirov@618: 		}
tikhomirov@618: 	}
tikhomirov@618: 
tikhomirov@618: 	public int serializeLength() {
tikhomirov@618: 		return file.getLength(HgRepository.WORKING_COPY);
tikhomirov@618: 	}
tikhomirov@618: }