tikhomirov@170: /*
tikhomirov@170:  * Copyright (c) 2011 TMate Software Ltd
tikhomirov@170:  *  
tikhomirov@170:  * This program is free software; you can redistribute it and/or modify
tikhomirov@170:  * it under the terms of the GNU General Public License as published by
tikhomirov@170:  * the Free Software Foundation; version 2 of the License.
tikhomirov@170:  *
tikhomirov@170:  * This program is distributed in the hope that it will be useful,
tikhomirov@170:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@170:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@170:  * GNU General Public License for more details.
tikhomirov@170:  *
tikhomirov@170:  * For information on how to redistribute this software under
tikhomirov@170:  * the terms of a license other than GNU General Public License
tikhomirov@170:  * contact TMate Software at support@hg4j.com
tikhomirov@170:  */
tikhomirov@170: package org.tmatesoft.hg.repo;
tikhomirov@170: 
tikhomirov@170: import java.io.File;
tikhomirov@179: import java.io.FileOutputStream;
tikhomirov@176: import java.io.IOException;
tikhomirov@179: import java.io.InputStream;
tikhomirov@177: import java.io.InputStreamReader;
tikhomirov@177: import java.io.OutputStream;
tikhomirov@176: import java.io.StreamTokenizer;
tikhomirov@177: import java.net.HttpURLConnection;
tikhomirov@176: import java.net.MalformedURLException;
tikhomirov@171: import java.net.URL;
tikhomirov@176: import java.net.URLConnection;
tikhomirov@176: import java.security.cert.CertificateException;
tikhomirov@176: import java.security.cert.X509Certificate;
tikhomirov@178: import java.util.ArrayList;
tikhomirov@176: import java.util.Collection;
tikhomirov@171: import java.util.Collections;
tikhomirov@177: import java.util.Iterator;
tikhomirov@176: import java.util.LinkedHashMap;
tikhomirov@176: import java.util.LinkedList;
tikhomirov@170: import java.util.List;
tikhomirov@176: import java.util.Map;
tikhomirov@176: import java.util.prefs.BackingStoreException;
tikhomirov@176: import java.util.prefs.Preferences;
tikhomirov@179: import java.util.zip.InflaterInputStream;
tikhomirov@176: 
tikhomirov@176: import javax.net.ssl.HttpsURLConnection;
tikhomirov@176: import javax.net.ssl.SSLContext;
tikhomirov@176: import javax.net.ssl.TrustManager;
tikhomirov@176: import javax.net.ssl.X509TrustManager;
tikhomirov@170: 
tikhomirov@181: import org.tmatesoft.hg.core.HgBadArgumentException;
tikhomirov@177: import org.tmatesoft.hg.core.HgBadStateException;
tikhomirov@170: import org.tmatesoft.hg.core.HgException;
tikhomirov@170: import org.tmatesoft.hg.core.Nodeid;
tikhomirov@170: 
tikhomirov@170: /**
tikhomirov@170:  * WORK IN PROGRESS, DO NOT USE
tikhomirov@170:  * 
tikhomirov@170:  * @see http://mercurial.selenic.com/wiki/WireProtocol
tikhomirov@170:  * 
tikhomirov@170:  * @author Artem Tikhomirov
tikhomirov@170:  * @author TMate Software Ltd.
tikhomirov@170:  */
tikhomirov@170: public class HgRemoteRepository {
tikhomirov@171: 	
tikhomirov@176: 	private final URL url;
tikhomirov@176: 	private final SSLContext sslContext;
tikhomirov@176: 	private final String authInfo;
tikhomirov@181: 	private final boolean debug = Boolean.parseBoolean(System.getProperty("hg4j.remote.debug"));
tikhomirov@186: 	private HgLookup lookupHelper;
tikhomirov@176: 
tikhomirov@181: 	HgRemoteRepository(URL url) throws HgBadArgumentException {
tikhomirov@176: 		if (url == null) {
tikhomirov@176: 			throw new IllegalArgumentException();
tikhomirov@176: 		}
tikhomirov@176: 		this.url = url;
tikhomirov@176: 		if ("https".equals(url.getProtocol())) {
tikhomirov@176: 			try {
tikhomirov@176: 				sslContext = SSLContext.getInstance("SSL");
tikhomirov@176: 				class TrustEveryone implements X509TrustManager {
tikhomirov@176: 					public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
tikhomirov@176: 						System.out.println("checkClientTrusted " + authType);
tikhomirov@176: 					}
tikhomirov@176: 					public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
tikhomirov@176: 						System.out.println("checkServerTrusted" + authType);
tikhomirov@176: 					}
tikhomirov@176: 					public X509Certificate[] getAcceptedIssuers() {
tikhomirov@176: 						return new X509Certificate[0];
tikhomirov@176: 					}
tikhomirov@176: 				};
tikhomirov@176: 				sslContext.init(null, new TrustManager[] { new TrustEveryone() }, null);
tikhomirov@176: 			} catch (Exception ex) {
tikhomirov@181: 				throw new HgBadArgumentException("Can't initialize secure connection", ex);
tikhomirov@176: 			}
tikhomirov@176: 		} else {
tikhomirov@176: 			sslContext = null;
tikhomirov@176: 		}
tikhomirov@176: 		if (url.getUserInfo() != null) {
tikhomirov@176: 			String ai = null;
tikhomirov@176: 			try {
tikhomirov@176: 				// Hack to get Base64-encoded credentials
tikhomirov@176: 				Preferences tempNode = Preferences.userRoot().node("xxx");
tikhomirov@176: 				tempNode.putByteArray("xxx", url.getUserInfo().getBytes());
tikhomirov@176: 				ai = tempNode.get("xxx", null);
tikhomirov@176: 				tempNode.removeNode();
tikhomirov@176: 			} catch (BackingStoreException ex) {
tikhomirov@176: 				ex.printStackTrace();
tikhomirov@176: 				// IGNORE
tikhomirov@176: 			}
tikhomirov@176: 			authInfo = ai;
tikhomirov@176: 		} else {
tikhomirov@176: 			authInfo = null;
tikhomirov@176: 		}
tikhomirov@171: 	}
tikhomirov@171: 	
tikhomirov@181: 	public boolean isInvalid() throws HgException {
tikhomirov@181: 		// say hello to server, check response
tikhomirov@181: 		if (Boolean.FALSE.booleanValue()) {
tikhomirov@181: 			throw HgRepository.notImplemented();
tikhomirov@181: 		}
tikhomirov@181: 		return false; // FIXME
tikhomirov@181: 	}
tikhomirov@181: 
tikhomirov@181: 	/**
tikhomirov@181: 	 * @return human-readable address of the server, without user credentials or any other security information
tikhomirov@181: 	 */
tikhomirov@181: 	public String getLocation() {
tikhomirov@181: 		if (url.getUserInfo() == null) {
tikhomirov@181: 			return url.toExternalForm();
tikhomirov@181: 		}
tikhomirov@181: 		if (url.getPort() != -1) {
tikhomirov@181: 			return String.format("%s://%s:%d%s", url.getProtocol(), url.getHost(), url.getPort(), url.getPath());
tikhomirov@181: 		} else {
tikhomirov@181: 			return String.format("%s://%s%s", url.getProtocol(), url.getHost(), url.getPath());
tikhomirov@181: 		}
tikhomirov@181: 	}
tikhomirov@181: 
tikhomirov@178: 	public List<Nodeid> heads() throws HgException {
tikhomirov@178: 		try {
tikhomirov@178: 			URL u = new URL(url, url.getPath() + "?cmd=heads");
tikhomirov@178: 			HttpURLConnection c = setupConnection(u.openConnection());
tikhomirov@178: 			c.connect();
tikhomirov@178: 			if (debug) {
tikhomirov@178: 				dumpResponseHeader(u, c);
tikhomirov@178: 			}
tikhomirov@178: 			InputStreamReader is = new InputStreamReader(c.getInputStream(), "US-ASCII");
tikhomirov@178: 			StreamTokenizer st = new StreamTokenizer(is);
tikhomirov@178: 			st.ordinaryChars('0', '9');
tikhomirov@178: 			st.wordChars('0', '9');
tikhomirov@178: 			st.eolIsSignificant(false);
tikhomirov@178: 			LinkedList<Nodeid> parseResult = new LinkedList<Nodeid>();
tikhomirov@178: 			while (st.nextToken() != StreamTokenizer.TT_EOF) {
tikhomirov@178: 				parseResult.add(Nodeid.fromAscii(st.sval));
tikhomirov@178: 			}
tikhomirov@178: 			return parseResult;
tikhomirov@178: 		} catch (MalformedURLException ex) {
tikhomirov@178: 			throw new HgException(ex);
tikhomirov@178: 		} catch (IOException ex) {
tikhomirov@178: 			throw new HgException(ex);
tikhomirov@178: 		}
tikhomirov@171: 	}
tikhomirov@171: 	
tikhomirov@176: 	public List<Nodeid> between(Nodeid tip, Nodeid base) throws HgException {
tikhomirov@177: 		Range r = new Range(base, tip);
tikhomirov@177: 		// XXX shall handle errors like no range key in the returned map, not sure how.
tikhomirov@177: 		return between(Collections.singletonList(r)).get(r);
tikhomirov@177: 	}
tikhomirov@177: 
tikhomirov@177: 	/**
tikhomirov@177: 	 * @param ranges
tikhomirov@177: 	 * @return map, where keys are input instances, values are corresponding server reply
tikhomirov@177: 	 * @throws HgException 
tikhomirov@177: 	 */
tikhomirov@177: 	public Map<Range, List<Nodeid>> between(Collection<Range> ranges) throws HgException {
tikhomirov@177: 		if (ranges.isEmpty()) {
tikhomirov@177: 			return Collections.emptyMap();
tikhomirov@177: 		}
tikhomirov@177: 		// if fact, shall do other way round, this method shall send 
tikhomirov@177: 		LinkedHashMap<Range, List<Nodeid>> rv = new LinkedHashMap<HgRemoteRepository.Range, List<Nodeid>>(ranges.size() * 4 / 3);
tikhomirov@177: 		StringBuilder sb = new StringBuilder(20 + ranges.size() * 82);
tikhomirov@177: 		sb.append("pairs=");
tikhomirov@177: 		for (Range r : ranges) {
tikhomirov@177: 			sb.append(r.end.toString());
tikhomirov@177: 			sb.append('-');
tikhomirov@177: 			sb.append(r.start.toString());
tikhomirov@177: 			sb.append('+');
tikhomirov@177: 		}
tikhomirov@177: 		if (sb.charAt(sb.length() - 1) == '+') {
tikhomirov@177: 			// strip last space 
tikhomirov@177: 			sb.setLength(sb.length() - 1);
tikhomirov@177: 		}
tikhomirov@176: 		try {
tikhomirov@177: 			boolean usePOST = ranges.size() > 3;
tikhomirov@177: 			URL u = new URL(url, url.getPath() + "?cmd=between" + (usePOST ? "" : '&' + sb.toString()));
tikhomirov@177: 			HttpURLConnection c = setupConnection(u.openConnection());
tikhomirov@177: 			if (usePOST) {
tikhomirov@177: 				c.setRequestMethod("POST");
tikhomirov@177: 				c.setRequestProperty("Content-Length", String.valueOf(sb.length()/*nodeids are ASCII, bytes == characters */));
tikhomirov@177: 				c.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
tikhomirov@177: 				c.setDoOutput(true);
tikhomirov@177: 				c.connect();
tikhomirov@177: 				OutputStream os = c.getOutputStream();
tikhomirov@177: 				os.write(sb.toString().getBytes());
tikhomirov@177: 				os.flush();
tikhomirov@177: 				os.close();
tikhomirov@177: 			} else {
tikhomirov@177: 				c.connect();
tikhomirov@177: 			}
tikhomirov@178: 			if (debug) {
tikhomirov@178: 				System.out.printf("%d ranges, method:%s \n", ranges.size(), c.getRequestMethod());
tikhomirov@178: 				dumpResponseHeader(u, c);
tikhomirov@176: 			}
tikhomirov@177: 			InputStreamReader is = new InputStreamReader(c.getInputStream(), "US-ASCII");
tikhomirov@176: 			StreamTokenizer st = new StreamTokenizer(is);
tikhomirov@176: 			st.ordinaryChars('0', '9');
tikhomirov@176: 			st.wordChars('0', '9');
tikhomirov@177: 			st.eolIsSignificant(true);
tikhomirov@177: 			Iterator<Range> rangeItr = ranges.iterator();
tikhomirov@177: 			LinkedList<Nodeid> currRangeList = null;
tikhomirov@177: 			Range currRange = null;
tikhomirov@177: 			boolean possiblyEmptyNextLine = true;
tikhomirov@176: 			while (st.nextToken() != StreamTokenizer.TT_EOF) {
tikhomirov@177: 				if (st.ttype == StreamTokenizer.TT_EOL) {
tikhomirov@177: 					if (possiblyEmptyNextLine) {
tikhomirov@177: 						// newline follows newline;
tikhomirov@177: 						assert currRange == null;
tikhomirov@177: 						assert currRangeList == null;
tikhomirov@177: 						if (!rangeItr.hasNext()) {
tikhomirov@177: 							throw new HgBadStateException();
tikhomirov@177: 						}
tikhomirov@177: 						rv.put(rangeItr.next(), Collections.<Nodeid>emptyList());
tikhomirov@177: 					} else {
tikhomirov@177: 						if (currRange == null || currRangeList == null) {
tikhomirov@177: 							throw new HgBadStateException();
tikhomirov@177: 						}
tikhomirov@177: 						// indicate next range value is needed
tikhomirov@177: 						currRange = null;
tikhomirov@177: 						currRangeList = null;
tikhomirov@177: 						possiblyEmptyNextLine = true;
tikhomirov@177: 					}
tikhomirov@177: 				} else {
tikhomirov@177: 					possiblyEmptyNextLine = false;
tikhomirov@177: 					if (currRange == null) {
tikhomirov@177: 						if (!rangeItr.hasNext()) {
tikhomirov@177: 							throw new HgBadStateException();
tikhomirov@177: 						}
tikhomirov@177: 						currRange = rangeItr.next();
tikhomirov@177: 						currRangeList = new LinkedList<Nodeid>();
tikhomirov@177: 						rv.put(currRange, currRangeList);
tikhomirov@177: 					}
tikhomirov@177: 					Nodeid nid = Nodeid.fromAscii(st.sval);
tikhomirov@177: 					currRangeList.addLast(nid);
tikhomirov@177: 				}
tikhomirov@176: 			}
tikhomirov@176: 			is.close();
tikhomirov@176: 			return rv;
tikhomirov@176: 		} catch (MalformedURLException ex) {
tikhomirov@176: 			throw new HgException(ex);
tikhomirov@176: 		} catch (IOException ex) {
tikhomirov@176: 			throw new HgException(ex);
tikhomirov@176: 		}
tikhomirov@176: 	}
tikhomirov@176: 
tikhomirov@178: 	public List<RemoteBranch> branches(List<Nodeid> nodes) throws HgException {
tikhomirov@178: 		StringBuilder sb = new StringBuilder(20 + nodes.size() * 41);
tikhomirov@178: 		sb.append("nodes=");
tikhomirov@178: 		for (Nodeid n : nodes) {
tikhomirov@178: 			sb.append(n.toString());
tikhomirov@178: 			sb.append('+');
tikhomirov@178: 		}
tikhomirov@178: 		if (sb.charAt(sb.length() - 1) == '+') {
tikhomirov@178: 			// strip last space 
tikhomirov@178: 			sb.setLength(sb.length() - 1);
tikhomirov@178: 		}
tikhomirov@178: 		try {
tikhomirov@178: 			URL u = new URL(url, url.getPath() + "?cmd=branches&" + sb.toString());
tikhomirov@178: 			HttpURLConnection c = setupConnection(u.openConnection());
tikhomirov@178: 			c.connect();
tikhomirov@178: 			if (debug) {
tikhomirov@178: 				dumpResponseHeader(u, c);
tikhomirov@178: 			}
tikhomirov@178: 			InputStreamReader is = new InputStreamReader(c.getInputStream(), "US-ASCII");
tikhomirov@178: 			StreamTokenizer st = new StreamTokenizer(is);
tikhomirov@178: 			st.ordinaryChars('0', '9');
tikhomirov@178: 			st.wordChars('0', '9');
tikhomirov@178: 			st.eolIsSignificant(false);
tikhomirov@178: 			ArrayList<Nodeid> parseResult = new ArrayList<Nodeid>(nodes.size() * 4);
tikhomirov@178: 			while (st.nextToken() != StreamTokenizer.TT_EOF) {
tikhomirov@178: 				parseResult.add(Nodeid.fromAscii(st.sval));
tikhomirov@178: 			}
tikhomirov@178: 			if (parseResult.size() != nodes.size() * 4) {
tikhomirov@178: 				throw new HgException(String.format("Bad number of nodeids in result (shall be factor 4), expected %d, got %d", nodes.size()*4, parseResult.size()));
tikhomirov@178: 			}
tikhomirov@178: 			ArrayList<RemoteBranch> rv = new ArrayList<RemoteBranch>(nodes.size());
tikhomirov@178: 			for (int i = 0; i < nodes.size(); i++) {
tikhomirov@178: 				RemoteBranch rb = new RemoteBranch(parseResult.get(i*4), parseResult.get(i*4 + 1), parseResult.get(i*4 + 2), parseResult.get(i*4 + 3));
tikhomirov@178: 				rv.add(rb);
tikhomirov@178: 			}
tikhomirov@178: 			return rv;
tikhomirov@178: 		} catch (MalformedURLException ex) {
tikhomirov@178: 			throw new HgException(ex);
tikhomirov@178: 		} catch (IOException ex) {
tikhomirov@178: 			throw new HgException(ex);
tikhomirov@178: 		}
tikhomirov@171: 	}
tikhomirov@170: 
tikhomirov@186: 	/*
tikhomirov@202: 	 * XXX need to describe behavior when roots arg is empty; our RepositoryComparator code currently returns empty lists when
tikhomirov@202: 	 * no common elements found, which in turn means we need to query changes starting with NULL nodeid.
tikhomirov@202: 	 * 
tikhomirov@186: 	 * WireProtocol wiki: roots = a list of the latest nodes on every service side changeset branch that both the client and server know about.
tikhomirov@186: 	 * 
tikhomirov@186: 	 * Perhaps, shall be named 'changegroup'
tikhomirov@186: 
tikhomirov@186: 	 * Changegroup: 
tikhomirov@186: 	 * http://mercurial.selenic.com/wiki/Merge 
tikhomirov@186: 	 * http://mercurial.selenic.com/wiki/WireProtocol 
tikhomirov@186: 	 * 
tikhomirov@186: 	 * according to latter, bundleformat data is sent through zlib
tikhomirov@186: 	 * (there's no header like HG10?? with the server output, though, 
tikhomirov@186: 	 * as one may expect according to http://mercurial.selenic.com/wiki/BundleFormat)
tikhomirov@186: 	 */
tikhomirov@170: 	public HgBundle getChanges(List<Nodeid> roots) throws HgException {
tikhomirov@202: 		List<Nodeid> _roots = roots.isEmpty() ? Collections.singletonList(Nodeid.NULL) : roots;
tikhomirov@202: 		StringBuilder sb = new StringBuilder(20 + _roots.size() * 41);
tikhomirov@179: 		sb.append("roots=");
tikhomirov@202: 		for (Nodeid n : _roots) {
tikhomirov@179: 			sb.append(n.toString());
tikhomirov@179: 			sb.append('+');
tikhomirov@179: 		}
tikhomirov@179: 		if (sb.charAt(sb.length() - 1) == '+') {
tikhomirov@179: 			// strip last space 
tikhomirov@179: 			sb.setLength(sb.length() - 1);
tikhomirov@179: 		}
tikhomirov@179: 		try {
tikhomirov@179: 			URL u = new URL(url, url.getPath() + "?cmd=changegroup&" + sb.toString());
tikhomirov@179: 			HttpURLConnection c = setupConnection(u.openConnection());
tikhomirov@179: 			c.connect();
tikhomirov@179: 			if (debug) {
tikhomirov@179: 				dumpResponseHeader(u, c);
tikhomirov@179: 			}
tikhomirov@179: 			File tf = writeBundle(c.getInputStream(), false, "HG10GZ" /*didn't see any other that zip*/);
tikhomirov@190: 			if (debug) {
tikhomirov@190: 				System.out.printf("Wrote bundle %s for roots %s", tf, sb);
tikhomirov@190: 			}
tikhomirov@186: 			return getLookupHelper().loadBundle(tf);
tikhomirov@179: 		} catch (MalformedURLException ex) {
tikhomirov@179: 			throw new HgException(ex);
tikhomirov@179: 		} catch (IOException ex) {
tikhomirov@179: 			throw new HgException(ex);
tikhomirov@179: 		}
tikhomirov@170: 	}
tikhomirov@186: 
tikhomirov@203: 	@Override
tikhomirov@203: 	public String toString() {
tikhomirov@203: 		return getClass().getSimpleName() + '[' + getLocation() + ']';
tikhomirov@203: 	}
tikhomirov@203: 
tikhomirov@186: 	private HgLookup getLookupHelper() {
tikhomirov@186: 		if (lookupHelper == null) {
tikhomirov@186: 			lookupHelper = new HgLookup();
tikhomirov@186: 		}
tikhomirov@186: 		return lookupHelper;
tikhomirov@186: 	}
tikhomirov@176: 	
tikhomirov@177: 	private HttpURLConnection setupConnection(URLConnection urlConnection) {
tikhomirov@177: 		urlConnection.setRequestProperty("User-Agent", "hg4j/0.5.0");
tikhomirov@176: 		urlConnection.addRequestProperty("Accept", "application/mercurial-0.1");
tikhomirov@176: 		if (authInfo != null) {
tikhomirov@176: 			urlConnection.addRequestProperty("Authorization", "Basic " + authInfo);
tikhomirov@176: 		}
tikhomirov@176: 		if (sslContext != null) {
tikhomirov@176: 			((HttpsURLConnection) urlConnection).setSSLSocketFactory(sslContext.getSocketFactory());
tikhomirov@176: 		}
tikhomirov@177: 		return (HttpURLConnection) urlConnection;
tikhomirov@176: 	}
tikhomirov@171: 
tikhomirov@178: 	private void dumpResponseHeader(URL u, HttpURLConnection c) {
tikhomirov@178: 		System.out.printf("Query (%d bytes):%s\n", u.getQuery().length(), u.getQuery());
tikhomirov@178: 		System.out.println("Response headers:");
tikhomirov@178: 		final Map<String, List<String>> headerFields = c.getHeaderFields();
tikhomirov@178: 		for (String s : headerFields.keySet()) {
tikhomirov@178: 			System.out.printf("%s: %s\n", s, c.getHeaderField(s));
tikhomirov@178: 		}
tikhomirov@178: 	}
tikhomirov@179: 	
tikhomirov@179: 	private static File writeBundle(InputStream is, boolean decompress, String header) throws IOException {
tikhomirov@179: 		InputStream zipStream = decompress ? new InflaterInputStream(is) : is;
tikhomirov@179: 		File tf = File.createTempFile("hg-bundle-", null);
tikhomirov@179: 		FileOutputStream fos = new FileOutputStream(tf);
tikhomirov@179: 		fos.write(header.getBytes());
tikhomirov@179: 		int r;
tikhomirov@179: 		byte[] buf = new byte[8*1024];
tikhomirov@179: 		while ((r = zipStream.read(buf)) != -1) {
tikhomirov@179: 			fos.write(buf, 0, r);
tikhomirov@179: 		}
tikhomirov@179: 		fos.close();
tikhomirov@179: 		zipStream.close();
tikhomirov@179: 		return tf;
tikhomirov@179: 	}
tikhomirov@179: 
tikhomirov@178: 
tikhomirov@176: 	public static final class Range {
tikhomirov@176: 		/**
tikhomirov@176: 		 * Root of the range, earlier revision
tikhomirov@176: 		 */
tikhomirov@176: 		public final Nodeid start;
tikhomirov@176: 		/**
tikhomirov@176: 		 * Head of the range, later revision.
tikhomirov@176: 		 */
tikhomirov@176: 		public final Nodeid end;
tikhomirov@176: 		
tikhomirov@176: 		/**
tikhomirov@176: 		 * @param from - root/base revision
tikhomirov@176: 		 * @param to - head/tip revision
tikhomirov@176: 		 */
tikhomirov@176: 		public Range(Nodeid from, Nodeid to) {
tikhomirov@176: 			start = from;
tikhomirov@176: 			end = to;
tikhomirov@176: 		}
tikhomirov@176: 	}
tikhomirov@184: 
tikhomirov@171: 	public static final class RemoteBranch {
tikhomirov@171: 		public final Nodeid head, root, p1, p2;
tikhomirov@171: 		
tikhomirov@171: 		public RemoteBranch(Nodeid h, Nodeid r, Nodeid parent1, Nodeid parent2) {
tikhomirov@171: 			head = h;
tikhomirov@171: 			root = r;
tikhomirov@171: 			p1 = parent1;
tikhomirov@171: 			p2 = parent2;
tikhomirov@171: 		}
tikhomirov@171: 
tikhomirov@171: 		@Override
tikhomirov@171: 		public boolean equals(Object obj) {
tikhomirov@171: 			if (this == obj) {
tikhomirov@171: 				return true;
tikhomirov@171: 			}
tikhomirov@171: 			if (false == obj instanceof RemoteBranch) {
tikhomirov@171: 				return false;
tikhomirov@171: 			}
tikhomirov@171: 			RemoteBranch o = (RemoteBranch) obj;
tikhomirov@171: 			return head.equals(o.head) && root.equals(o.root) && (p1 == null && o.p1 == null || p1.equals(o.p1)) && (p2 == null && o.p2 == null || p2.equals(o.p2));
tikhomirov@171: 		}
tikhomirov@171: 	}
tikhomirov@170: }