tikhomirov@107: /*
tikhomirov@107:  * Copyright (c) 2011 TMate Software Ltd
tikhomirov@107:  *  
tikhomirov@107:  * This program is free software; you can redistribute it and/or modify
tikhomirov@107:  * it under the terms of the GNU General Public License as published by
tikhomirov@107:  * the Free Software Foundation; version 2 of the License.
tikhomirov@107:  *
tikhomirov@107:  * This program is distributed in the hope that it will be useful,
tikhomirov@107:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@107:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@107:  * GNU General Public License for more details.
tikhomirov@107:  *
tikhomirov@107:  * For information on how to redistribute this software under
tikhomirov@107:  * the terms of a license other than GNU General Public License
tikhomirov@107:  * contact TMate Software at support@svnkit.com
tikhomirov@107:  */
tikhomirov@107: package org.tmatesoft.hg.core;
tikhomirov@107: 
tikhomirov@107: import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
tikhomirov@107: import static org.tmatesoft.hg.repo.HgRepository.TIP;
tikhomirov@107: 
tikhomirov@107: import java.io.FileNotFoundException;
tikhomirov@107: 
tikhomirov@107: import org.tmatesoft.hg.repo.HgDataFile;
tikhomirov@107: import org.tmatesoft.hg.repo.HgRepository;
tikhomirov@115: import org.tmatesoft.hg.util.ByteChannel;
tikhomirov@107: 
tikhomirov@107: /**
tikhomirov@107:  * Command to obtain content of a 
tikhomirov@107:  * 
tikhomirov@107:  * @author Artem Tikhomirov
tikhomirov@107:  * @author TMate Software Ltd.
tikhomirov@107:  */
tikhomirov@107: public class CatCommand {
tikhomirov@107: 
tikhomirov@107: 	private final HgRepository repo;
tikhomirov@107: 	private Path file;
tikhomirov@107: 	private int localRevision = TIP;
tikhomirov@107: 	private Nodeid revision;
tikhomirov@107: 
tikhomirov@107: 	public CatCommand(HgRepository hgRepo) {
tikhomirov@107: 		repo = hgRepo;
tikhomirov@107: 	}
tikhomirov@107: 
tikhomirov@107: 	public CatCommand file(Path fname) {
tikhomirov@107: 		file = fname;
tikhomirov@107: 		return this;
tikhomirov@107: 	}
tikhomirov@107: 
tikhomirov@107: 	// rev can't be WORKING_COPY (if allowed, need to implement in #execute())
tikhomirov@107: 	public CatCommand revision(int rev) {
tikhomirov@107: 		localRevision = rev;
tikhomirov@107: 		revision = null;
tikhomirov@107: 		return this;
tikhomirov@107: 	}
tikhomirov@107: 	
tikhomirov@107: 	public CatCommand revision(Nodeid nodeid) {
tikhomirov@107: 		revision = nodeid;
tikhomirov@107: 		localRevision = BAD_REVISION;
tikhomirov@107: 		return this;
tikhomirov@107: 	}
tikhomirov@107: 
tikhomirov@115: 	public void execute(ByteChannel sink) throws Exception /*TODO own exception type*/ {
tikhomirov@107: 		if (localRevision == BAD_REVISION && revision == null) {
tikhomirov@107: 			throw new IllegalArgumentException("Either local file revision number or nodeid shall be specified");
tikhomirov@107: 		}
tikhomirov@107: 		if (file == null) {
tikhomirov@107: 			throw new IllegalArgumentException("Name of the file is missing");
tikhomirov@107: 		}
tikhomirov@115: 		if (sink == null) {
tikhomirov@107: 			throw new IllegalArgumentException();
tikhomirov@107: 		}
tikhomirov@107: 		HgDataFile dataFile = repo.getFileNode(file);
tikhomirov@107: 		if (!dataFile.exists()) {
tikhomirov@107: 			throw new FileNotFoundException();
tikhomirov@107: 		}
tikhomirov@115: 		int revToExtract;
tikhomirov@107: 		if (revision != null) {
tikhomirov@115: 			revToExtract = dataFile.getLocalRevision(revision);
tikhomirov@107: 		} else {
tikhomirov@115: 			revToExtract = localRevision;
tikhomirov@107: 		}
tikhomirov@115: 		dataFile.content(revToExtract, sink);
tikhomirov@107: 	}
tikhomirov@107: }