tikhomirov@1: /**
tikhomirov@1:  * Copyright (c) 2010 Artem Tikhomirov 
tikhomirov@1:  */
tikhomirov@1: package com.tmate.hgkit.ll;
tikhomirov@1: 
tikhomirov@8: import java.io.BufferedReader;
tikhomirov@1: import java.io.File;
tikhomirov@8: import java.io.FileInputStream;
tikhomirov@1: import java.io.IOException;
tikhomirov@8: import java.io.InputStreamReader;
tikhomirov@3: import java.lang.ref.SoftReference;
tikhomirov@8: import java.util.Arrays;
tikhomirov@3: import java.util.HashMap;
tikhomirov@8: import java.util.TreeSet;
tikhomirov@1: 
tikhomirov@1: /**
tikhomirov@1:  * @author artem
tikhomirov@1:  */
tikhomirov@1: public class LocalHgRepo extends HgRepository {
tikhomirov@1: 
tikhomirov@8: 	private File repoDir; // .hg folder
tikhomirov@1: 	private final String repoLocation;
tikhomirov@1: 
tikhomirov@1: 	public LocalHgRepo(String repositoryPath) {
tikhomirov@1: 		setInvalid(true);
tikhomirov@1: 		repoLocation = repositoryPath;
tikhomirov@1: 	}
tikhomirov@1: 	
tikhomirov@1: 	public LocalHgRepo(File repositoryRoot) throws IOException {
tikhomirov@1: 		assert ".hg".equals(repositoryRoot.getName()) && repositoryRoot.isDirectory();
tikhomirov@1: 		setInvalid(false);
tikhomirov@1: 		repoDir = repositoryRoot;
tikhomirov@1: 		repoLocation = repositoryRoot.getParentFile().getCanonicalPath();
tikhomirov@8: 		parseRequires();
tikhomirov@1: 	}
tikhomirov@1: 
tikhomirov@1: 	@Override
tikhomirov@1: 	public String getLocation() {
tikhomirov@1: 		return repoLocation;
tikhomirov@1: 	}
tikhomirov@3: 
tikhomirov@3: 	private final HashMap<String, SoftReference<RevlogStream>> streamsCache = new HashMap<String, SoftReference<RevlogStream>>();
tikhomirov@3: 
tikhomirov@3: 	/**
tikhomirov@3: 	 * path - repository storage path (i.e. one usually with .i or .d)
tikhomirov@3: 	 */
tikhomirov@3: 	@Override
tikhomirov@3: 	protected RevlogStream resolve(String path) {
tikhomirov@3: 		final SoftReference<RevlogStream> ref = streamsCache.get(path);
tikhomirov@3: 		RevlogStream cached = ref == null ? null : ref.get();
tikhomirov@3: 		if (cached != null) {
tikhomirov@3: 			return cached;
tikhomirov@3: 		}
tikhomirov@3: 		File f = new File(repoDir, path);
tikhomirov@3: 		if (f.exists()) {
tikhomirov@3: 			RevlogStream s = new RevlogStream(f);
tikhomirov@3: 			streamsCache.put(path, new SoftReference<RevlogStream>(s));
tikhomirov@3: 			return s;
tikhomirov@3: 		}
tikhomirov@3: 		return null;
tikhomirov@3: 	}
tikhomirov@3: 
tikhomirov@3: 	@Override
tikhomirov@3: 	public HgDataFile getFileNode(String path) {
tikhomirov@3: 		String nPath = normalize(path);
tikhomirov@8: 		String storagePath = toStoragePath(nPath, true);
tikhomirov@3: 		RevlogStream content = resolve(storagePath);
tikhomirov@3: 		// XXX no content when no file? or HgDataFile.exists() to detect that? How about files that were removed in previous releases?
tikhomirov@3: 		return new HgDataFile(this, nPath, content);
tikhomirov@3: 	}
tikhomirov@8: 
tikhomirov@8: 	private boolean revlogv1;
tikhomirov@8: 	private boolean store;
tikhomirov@8: 	private boolean fncache;
tikhomirov@8: 	private boolean dotencode;
tikhomirov@3: 	
tikhomirov@8: 	
tikhomirov@8: 	private void parseRequires() {
tikhomirov@8: 		File requiresFile = new File(repoDir, "requires");
tikhomirov@8: 		if (!requiresFile.exists()) {
tikhomirov@8: 			return;
tikhomirov@8: 		}
tikhomirov@8: 		try {
tikhomirov@8: 			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(requiresFile)));
tikhomirov@8: 			String line;
tikhomirov@8: 			while ((line = br.readLine()) != null) {
tikhomirov@8: 				revlogv1 |= "revlogv1".equals(line);
tikhomirov@8: 				store |= "store".equals(line);
tikhomirov@8: 				fncache |= "fncache".equals(line);
tikhomirov@8: 				dotencode |= "dotencode".equals(line);
tikhomirov@8: 			}
tikhomirov@8: 		} catch (IOException ex) {
tikhomirov@8: 			ex.printStackTrace(); // FIXME log
tikhomirov@8: 		}
tikhomirov@8: 	}
tikhomirov@8: 
tikhomirov@3: 	// FIXME much more to be done, see store.py:_hybridencode
tikhomirov@8: 	// @see http://mercurial.selenic.com/wiki/CaseFoldingPlan
tikhomirov@8: 	protected String toStoragePath(String path, boolean data) {
tikhomirov@8: 		path = normalize(path);
tikhomirov@8: 		final String STR_STORE = "store/";
tikhomirov@8: 		final String STR_DATA = "data/";
tikhomirov@8: 		final String STR_DH = "dh/";
tikhomirov@8: 		if (!data) {
tikhomirov@8: 			return this.store ? STR_STORE + path : path;
tikhomirov@8: 		}
tikhomirov@8: 		path = path.replace(".hg/", ".hg.hg/").replace(".i/", ".i.hg/").replace(".d/", ".d.hg/");
tikhomirov@8: 		StringBuilder sb = new StringBuilder(path.length() << 1);
tikhomirov@8: 		if (store || fncache) {
tikhomirov@8: 			// encodefilename
tikhomirov@8: 			final String reservedChars = "\\:*?\"<>|";
tikhomirov@8: 			// in fact, \\ is unlikely to match, ever - we've replaced all of them already, above. Just regards to store.py 
tikhomirov@8: 			int x;
tikhomirov@8: 			char[] hexByte = new char[2];
tikhomirov@8: 			for (int i = 0; i < path.length(); i++) {
tikhomirov@8: 				final char ch = path.charAt(i);
tikhomirov@8: 				if (ch >= 'a' && ch <= 'z') {
tikhomirov@8: 					sb.append(ch); // POIRAE
tikhomirov@8: 				} else if (ch >= 'A' && ch <= 'Z') {
tikhomirov@8: 					sb.append('_');
tikhomirov@8: 					sb.append(Character.toLowerCase(ch)); // Perhaps, (char) (((int) ch) + 32)? Even better, |= 0x20? 
tikhomirov@8: 				} else if ( (x = reservedChars.indexOf(ch)) != -1) {
tikhomirov@8: 					sb.append('~');
tikhomirov@8: 					sb.append(toHexByte(reservedChars.charAt(x), hexByte));
tikhomirov@8: 				} else if ((ch >= '~' /*126*/ && ch <= 255) || ch < ' ' /*32*/) {
tikhomirov@8: 					sb.append('~');
tikhomirov@8: 					sb.append(toHexByte(ch, hexByte));
tikhomirov@8: 				} else if (ch == '_') {
tikhomirov@8: 					// note, encoding from store.py:_buildencodefun and :_build_lower_encodefun
tikhomirov@8: 					// differ in the way they process '_' (latter doesn't escape it)
tikhomirov@8: 					sb.append('_');
tikhomirov@8: 					sb.append('_');
tikhomirov@8: 				} else {
tikhomirov@8: 					sb.append(ch);
tikhomirov@8: 				}
tikhomirov@8: 			}
tikhomirov@8: 			// auxencode
tikhomirov@8: 			if (fncache) {
tikhomirov@8: 				x = 0; // last segment start
tikhomirov@8: 				final TreeSet<String> windowsReservedFilenames = new TreeSet<String>();
tikhomirov@8: 				windowsReservedFilenames.addAll(Arrays.asList("con prn aux nul com1 com2 com3 com4 com5 com6 com7 com8 com9 lpt1 lpt2 lpt3 lpt4 lpt5 lpt6 lpt7 lpt8 lpt9".split(" "))); 
tikhomirov@8: 				do {
tikhomirov@8: 					int i = sb.indexOf("/", x);
tikhomirov@8: 					if (i == -1) {
tikhomirov@8: 						i = sb.length();
tikhomirov@8: 					}
tikhomirov@8: 					// windows reserved filenames are at least of length 3 
tikhomirov@8: 					if (i - x >= 3) {
tikhomirov@8: 						boolean found = false;
tikhomirov@8: 						if (i-x == 3) {
tikhomirov@8: 							found = windowsReservedFilenames.contains(sb.subSequence(x, i));
tikhomirov@8: 						} else if (sb.charAt(x+3) == '.') { // implicit i-x > 3
tikhomirov@8: 							found = windowsReservedFilenames.contains(sb.subSequence(x, x+3));
tikhomirov@8: 						} else if (i-x > 4 && sb.charAt(x+4) == '.') {
tikhomirov@8: 							found = windowsReservedFilenames.contains(sb.subSequence(x, x+4));
tikhomirov@8: 						}
tikhomirov@8: 						if (found) {
tikhomirov@8: 							sb.setCharAt(x, '~');
tikhomirov@8: 							sb.insert(x+1, toHexByte(sb.charAt(x+2), hexByte));
tikhomirov@8: 							i += 2;
tikhomirov@8: 						}
tikhomirov@8: 					}
tikhomirov@8: 					if (dotencode && (sb.charAt(x) == '.' || sb.charAt(x) == ' ')) {
tikhomirov@8: 						sb.insert(x+1, toHexByte(sb.charAt(x), hexByte));
tikhomirov@8: 						sb.setCharAt(x, '~'); // setChar *after* charAt/insert to get ~2e, not ~7e for '.'
tikhomirov@8: 						i += 2;
tikhomirov@8: 					}
tikhomirov@8: 					x = i+1;
tikhomirov@8: 				} while (x < sb.length());
tikhomirov@8: 			}
tikhomirov@8: 		}
tikhomirov@8: 		final int MAX_PATH_LEN_IN_HGSTORE = 120;
tikhomirov@8: 		if (fncache && (sb.length() + STR_DATA.length() > MAX_PATH_LEN_IN_HGSTORE)) {
tikhomirov@8: 			throw HgRepository.notImplemented(); // FIXME digest and fncache use
tikhomirov@8: 		}
tikhomirov@8: 		if (this.store) {
tikhomirov@8: 			sb.insert(0, STR_STORE + STR_DATA);
tikhomirov@8: 		}
tikhomirov@8: 		sb.append(".i");
tikhomirov@8: 		return sb.toString();
tikhomirov@8: 	}
tikhomirov@8: 
tikhomirov@8: 	private static char[] toHexByte(int ch, char[] buf) {
tikhomirov@8: 		assert buf.length > 1;
tikhomirov@8: 		final String hexDigits = "0123456789abcdef";
tikhomirov@8: 		buf[0] = hexDigits.charAt((ch & 0x00F0) >> 4);
tikhomirov@8: 		buf[1] = hexDigits.charAt(ch & 0x0F);
tikhomirov@8: 		return buf;
tikhomirov@3: 	}
tikhomirov@3: 
tikhomirov@3: 	private static String normalize(String path) {
tikhomirov@8: 		path = path.replace('\\', '/').replace("//", "/");
tikhomirov@8: 		if (path.startsWith("/")) {
tikhomirov@8: 			path = path.substring(1);
tikhomirov@8: 		}
tikhomirov@8: 		return path;
tikhomirov@3: 	}
tikhomirov@1: }