tikhomirov@50: /*
tikhomirov@74:  * Copyright (c) 2011 TMate Software Ltd
tikhomirov@74:  *  
tikhomirov@74:  * This program is free software; you can redistribute it and/or modify
tikhomirov@74:  * it under the terms of the GNU General Public License as published by
tikhomirov@74:  * the Free Software Foundation; version 2 of the License.
tikhomirov@74:  *
tikhomirov@74:  * This program is distributed in the hope that it will be useful,
tikhomirov@74:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
tikhomirov@74:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
tikhomirov@74:  * GNU General Public License for more details.
tikhomirov@74:  *
tikhomirov@74:  * For information on how to redistribute this software under
tikhomirov@74:  * the terms of a license other than GNU General Public License
tikhomirov@102:  * contact TMate Software at support@hg4j.com
tikhomirov@50:  */
tikhomirov@74: package org.tmatesoft.hg.repo;
tikhomirov@50: 
tikhomirov@104: import java.io.BufferedReader;
tikhomirov@104: import java.io.File;
tikhomirov@104: import java.io.FileReader;
tikhomirov@104: import java.io.IOException;
tikhomirov@104: import java.util.ArrayList;
tikhomirov@104: import java.util.HashMap;
tikhomirov@104: import java.util.LinkedList;
tikhomirov@50: import java.util.List;
tikhomirov@104: import java.util.Map;
tikhomirov@104: import java.util.TreeMap;
tikhomirov@50: 
tikhomirov@74: import org.tmatesoft.hg.core.Nodeid;
tikhomirov@74: 
tikhomirov@50: /**
tikhomirov@104:  * @see http://mercurial.selenic.com/wiki/TagDesign
tikhomirov@74:  *
tikhomirov@74:  * @author Artem Tikhomirov
tikhomirov@74:  * @author TMate Software Ltd.
tikhomirov@50:  */
tikhomirov@50: public class HgTags {
tikhomirov@104: 	// global tags come from ".hgtags"
tikhomirov@104: 	// local come from ".hg/localtags"
tikhomirov@104: 
tikhomirov@104: 	private final Map<Nodeid, List<String>> globalToName;
tikhomirov@104: 	private final Map<Nodeid, List<String>> localToName;
tikhomirov@104: 	private final Map<String, List<Nodeid>> globalFromName;
tikhomirov@104: 	private final Map<String, List<Nodeid>> localFromName;
tikhomirov@104: 	
tikhomirov@104: 	
tikhomirov@104: 	/*package-local*/ HgTags() {
tikhomirov@104: 		globalToName =  new HashMap<Nodeid, List<String>>();
tikhomirov@104: 		localToName  =  new HashMap<Nodeid, List<String>>();
tikhomirov@104: 		globalFromName = new TreeMap<String, List<Nodeid>>();
tikhomirov@104: 		localFromName  = new TreeMap<String, List<Nodeid>>();
tikhomirov@104: 	}
tikhomirov@104: 	
tikhomirov@104: 	/*package-local*/ void readLocal(File localTags) throws IOException {
tikhomirov@104: 		if (localTags == null || localTags.isDirectory()) {
tikhomirov@104: 			throw new IllegalArgumentException(String.valueOf(localTags));
tikhomirov@104: 		}
tikhomirov@104: 		read(localTags, localToName, localFromName);
tikhomirov@104: 	}
tikhomirov@104: 	
tikhomirov@104: 	/*package-local*/ void readGlobal(File globalTags) throws IOException {
tikhomirov@104: 		if (globalTags == null || globalTags.isDirectory()) {
tikhomirov@104: 			throw new IllegalArgumentException(String.valueOf(globalTags));
tikhomirov@104: 		}
tikhomirov@104: 		read(globalTags, globalToName, globalFromName);
tikhomirov@104: 	}
tikhomirov@104: 	
tikhomirov@104: 	private void read(File f, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
tikhomirov@104: 		if (!f.canRead()) {
tikhomirov@104: 			return;
tikhomirov@104: 		}
tikhomirov@104: 		BufferedReader r = null;
tikhomirov@104: 		try {
tikhomirov@104: 			r = new BufferedReader(new FileReader(f));
tikhomirov@104: 			read(r, nid2name, name2nid);
tikhomirov@104: 		} finally {
tikhomirov@104: 			if (r != null) {
tikhomirov@104: 				r.close();
tikhomirov@104: 			}
tikhomirov@104: 		}
tikhomirov@104: 	}
tikhomirov@104: 	
tikhomirov@104: 	private void read(BufferedReader reader, Map<Nodeid,List<String>> nid2name, Map<String, List<Nodeid>> name2nid) throws IOException {
tikhomirov@104: 		String line;
tikhomirov@104: 		while ((line = reader.readLine()) != null) {
tikhomirov@104: 			line = line.trim();
tikhomirov@104: 			if (line.length() == 0) {
tikhomirov@104: 				continue;
tikhomirov@104: 			}
tikhomirov@104: 			if (line.length() < 40+2 /*nodeid, space and at least single-char tagname*/) {
tikhomirov@104: 				System.out.println("Bad tags line:" + line); // FIXME log or otherwise report (IStatus analog?) 
tikhomirov@104: 				continue;
tikhomirov@104: 			}
tikhomirov@104: 			int spacePos = line.indexOf(' ');
tikhomirov@104: 			if (spacePos != -1) {
tikhomirov@104: 				assert spacePos == 40;
tikhomirov@104: 				final byte[] nodeidBytes = line.substring(0, spacePos).getBytes();
tikhomirov@104: 				Nodeid nid = Nodeid.fromAscii(nodeidBytes, 0, nodeidBytes.length);
tikhomirov@104: 				String tagName = line.substring(spacePos+1);
tikhomirov@104: 				List<Nodeid> nids = name2nid.get(tagName);
tikhomirov@104: 				if (nids == null) {
tikhomirov@104: 					nids = new LinkedList<Nodeid>();
tikhomirov@104: 					// tagName is substring of full line, thus need a copy to let the line be GC'ed
tikhomirov@104: 					// new String(tagName.toCharArray()) is more expressive, but results in 1 extra arraycopy
tikhomirov@104: 					tagName = new String(tagName);
tikhomirov@104: 					name2nid.put(tagName, nids);
tikhomirov@104: 				}
tikhomirov@104: 				// XXX repo.getNodeidCache().nodeid(nid);
tikhomirov@104: 				((LinkedList<Nodeid>) nids).addFirst(nid);
tikhomirov@104: 				List<String> revTags = nid2name.get(nid);
tikhomirov@104: 				if (revTags == null) {
tikhomirov@104: 					revTags = new LinkedList<String>();
tikhomirov@104: 					nid2name.put(nid, revTags);
tikhomirov@104: 				}
tikhomirov@104: 				revTags.add(tagName);
tikhomirov@104: 			} else {
tikhomirov@104: 				System.out.println("Bad tags line:" + line); // FIXME see above
tikhomirov@104: 			}
tikhomirov@104: 		}
tikhomirov@104: 	}
tikhomirov@50: 
tikhomirov@50: 	public List<String> tags(Nodeid nid) {
tikhomirov@104: 		ArrayList<String> rv = new ArrayList<String>(5);
tikhomirov@104: 		List<String> l;
tikhomirov@104: 		if ((l = localToName.get(nid)) != null) {
tikhomirov@104: 			rv.addAll(l);
tikhomirov@104: 		}
tikhomirov@104: 		if ((l = globalToName.get(nid)) != null) {
tikhomirov@104: 			rv.addAll(l);
tikhomirov@104: 		}
tikhomirov@104: 		return rv;
tikhomirov@50: 	}
tikhomirov@50: 
tikhomirov@50: 	public boolean isTagged(Nodeid nid) {
tikhomirov@104: 		return localToName.containsKey(nid) || globalToName.containsKey(nid);
tikhomirov@104: 	}
tikhomirov@104: 
tikhomirov@104: 	public List<Nodeid> tagged(String tagName) {
tikhomirov@104: 		ArrayList<Nodeid> rv = new ArrayList<Nodeid>(5);
tikhomirov@104: 		List<Nodeid> l;
tikhomirov@104: 		if ((l = localFromName.get(tagName)) != null) {
tikhomirov@104: 			rv.addAll(l);
tikhomirov@104: 		}
tikhomirov@104: 		if ((l = globalFromName.get(tagName)) != null) {
tikhomirov@104: 			rv.addAll(l);
tikhomirov@104: 		}
tikhomirov@104: 		return rv;
tikhomirov@50: 	}
tikhomirov@50: }