tikhomirov@539: /*
tikhomirov@539:  * Copyright (c) 2013 TMate Software Ltd
tikhomirov@539:  *  
tikhomirov@539:  * This program is free software; you can redistribute it and/or modify
tikhomirov@539:  * it under the terms of the GNU General Public License as published by
tikhomirov@539:  * the Free Software Foundation; version 2 of the License.
tikhomirov@539:  *
tikhomirov@539:  * This program is distributed in the hope that it will be useful,
tikhomirov@539:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@539:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@539:  * GNU General Public License for more details.
tikhomirov@539:  *
tikhomirov@539:  * For information on how to redistribute this software under
tikhomirov@539:  * the terms of a license other than GNU General Public License
tikhomirov@539:  * contact TMate Software at support@hg4j.com
tikhomirov@539:  */
tikhomirov@539: package org.tmatesoft.hg.internal;
tikhomirov@539: 
tikhomirov@647: import static org.tmatesoft.hg.repo.HgRepositoryFiles.FNCache;
tikhomirov@647: 
tikhomirov@539: import java.io.File;
tikhomirov@539: import java.io.FileOutputStream;
tikhomirov@539: import java.io.IOException;
tikhomirov@616: import java.nio.ByteBuffer;
tikhomirov@616: import java.nio.CharBuffer;
tikhomirov@616: import java.nio.channels.FileChannel;
tikhomirov@539: import java.nio.charset.Charset;
tikhomirov@539: import java.util.ArrayList;
tikhomirov@559: import java.util.List;
tikhomirov@539: 
tikhomirov@539: import org.tmatesoft.hg.util.Path;
tikhomirov@539: 
tikhomirov@539: /**
tikhomirov@559:  * Append-only fncache support
tikhomirov@559:  * 
tikhomirov@539:  * <blockquote>
tikhomirov@539:  * The fncache file contains the paths of all filelog files in the store as encoded by mercurial.filelog.encodedir. The paths are separated by '\n' (LF).
tikhomirov@539:  * </blockquote>
tikhomirov@539:  * @see http://mercurial.selenic.com/wiki/fncacheRepoFormat
tikhomirov@559:  * 
tikhomirov@559:  * 
tikhomirov@539:  * @author Artem Tikhomirov
tikhomirov@539:  * @author TMate Software Ltd.
tikhomirov@539:  */
tikhomirov@539: public class FNCacheFile {
tikhomirov@539: 	
tikhomirov@539: 	private final Internals repo;
tikhomirov@559: //	private final List<Path> files;
tikhomirov@616: 	private final List<Path> addedDotI;
tikhomirov@616: 	private final List<Path> addedDotD;
tikhomirov@616: 	private final FNCachePathHelper pathHelper;
tikhomirov@539: 
tikhomirov@539: 	public FNCacheFile(Internals internalRepo) {
tikhomirov@539: 		repo = internalRepo;
tikhomirov@559: //		files = new ArrayList<Path>();
tikhomirov@616: 		pathHelper = new FNCachePathHelper();
tikhomirov@616: 		addedDotI = new ArrayList<Path>(5);
tikhomirov@616: 		addedDotD = new ArrayList<Path>(5);
tikhomirov@539: 	}
tikhomirov@539: 
tikhomirov@559: 	/*
tikhomirov@559: 	 * For append-only option, we don't care reading the original content
tikhomirov@539: 	public void read(Path.Source pathFactory) throws IOException {
tikhomirov@539: 		File f = fncacheFile();
tikhomirov@539: 		files.clear();
tikhomirov@539: 		if (!f.exists()) {
tikhomirov@539: 			return;
tikhomirov@539: 		}
tikhomirov@539: 		ArrayList<String> entries = new ArrayList<String>();
tikhomirov@539: 		// names in fncache are in local encoding, shall translate to unicode
tikhomirov@539: 		new LineReader(f, repo.getSessionContext().getLog(), repo.getFilenameEncoding()).read(new LineReader.SimpleLineCollector(), entries);
tikhomirov@539: 		for (String e : entries) {
tikhomirov@624: 			// XXX plain wrong, need either to decode paths and strip off .i/.d or (if keep names as is) change write()
tikhomirov@539: 			files.add(pathFactory.path(e));
tikhomirov@539: 		}
tikhomirov@539: 	}
tikhomirov@559: 	*/
tikhomirov@539: 	
tikhomirov@663: 	public void write() throws IOException { // FIXME transaction! and HgIOException
tikhomirov@616: 		if (addedDotI.isEmpty() && addedDotD.isEmpty()) {
tikhomirov@539: 			return;
tikhomirov@539: 		}
tikhomirov@647: 		File f = repo.getRepositoryFile(FNCache);
tikhomirov@539: 		f.getParentFile().mkdirs();
tikhomirov@539: 		final Charset filenameEncoding = repo.getFilenameEncoding();
tikhomirov@616: 		ArrayList<CharBuffer> added = new ArrayList<CharBuffer>();
tikhomirov@616: 		for (Path p : addedDotI) {
tikhomirov@616: 			added.add(CharBuffer.wrap(pathHelper.rewrite(p)));
tikhomirov@616: 		}
tikhomirov@616: 		for (Path p : addedDotD) {
tikhomirov@616: 			// XXX FNCachePathHelper always return name of an index file, need to change it into a name of data file,
tikhomirov@616: 			// although the approach (to replace last char) is depressingly awful
tikhomirov@616: 			CharSequence cs = pathHelper.rewrite(p);
tikhomirov@616: 			CharBuffer cb = CharBuffer.allocate(cs.length());
tikhomirov@616: 			cb.append(cs);
tikhomirov@616: 			cb.put(cs.length()-1, 'd');
tikhomirov@616: 			cb.flip();
tikhomirov@616: 			added.add(cb);
tikhomirov@616: 		}
tikhomirov@616: 		FileChannel fncacheFile = new FileOutputStream(f, true).getChannel();
tikhomirov@616: 		ByteBuffer lf = ByteBuffer.wrap(new byte[] { 0x0A });
tikhomirov@616: 		for (CharBuffer b : added) {
tikhomirov@616: 			fncacheFile.write(filenameEncoding.encode(b));
tikhomirov@616: 			fncacheFile.write(lf);
tikhomirov@616: 			lf.rewind();
tikhomirov@539: 		}
tikhomirov@539: 		fncacheFile.close();
tikhomirov@539: 	}
tikhomirov@539: 
tikhomirov@616: 	public void addIndex(Path p) {
tikhomirov@616: 		addedDotI.add(p);
tikhomirov@616: 	}
tikhomirov@616: 
tikhomirov@616: 	public void addData(Path p) {
tikhomirov@616: 		addedDotD.add(p);
tikhomirov@539: 	}
tikhomirov@663: 
tikhomirov@663: 	/**
tikhomirov@663: 	 * Register new files with fncache if one is enabled for the repo, do nothing otherwise
tikhomirov@663: 	 */
tikhomirov@663: 	public static class Mediator {
tikhomirov@663: 		private final Internals repo;
tikhomirov@663: 		private FNCacheFile fncache;
tikhomirov@663: 
tikhomirov@663: 		public Mediator(Internals internalRepo) {
tikhomirov@663: 			repo = internalRepo;
tikhomirov@663: 		}
tikhomirov@663: 		
tikhomirov@663: 		public void registerNew(Path f, RevlogStream rs) {
tikhomirov@663: 			if (fncache != null || repo.fncacheInUse()) {
tikhomirov@663: 				if (fncache == null) {
tikhomirov@663: 					fncache = new FNCacheFile(repo);
tikhomirov@663: 				}
tikhomirov@663: 				fncache.addIndex(f);
tikhomirov@663: 				if (!rs.isInlineData()) {
tikhomirov@663: 					fncache.addData(f);
tikhomirov@663: 				}
tikhomirov@663: 			}
tikhomirov@663: 		}
tikhomirov@663: 		
tikhomirov@663: 		public void complete() throws IOException {
tikhomirov@663: 			if (fncache != null) {
tikhomirov@663: 				fncache.write();
tikhomirov@663: 			}
tikhomirov@663: 		}
tikhomirov@663: 	}
tikhomirov@539: }