--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/tmatesoft/hg/repo/WorkingCopyStatusCollector.java	Mon Jan 24 03:14:45 2011 +0100
@@ -0,0 +1,233 @@
+/*
+ * Copyright (c) 2011 TMate Software Ltd
+ *  
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * For information on how to redistribute this software under
+ * the terms of a license other than GNU General Public License
+ * contact TMate Software at support@svnkit.com
+ */
+package org.tmatesoft.hg.repo;
+
+import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
+import static org.tmatesoft.hg.repo.HgRepository.TIP;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.tmatesoft.hg.core.Nodeid;
+import org.tmatesoft.hg.util.FileWalker;
+
+/**
+ *
+ * @author Artem Tikhomirov
+ * @author TMate Software Ltd.
+ */
+public class WorkingCopyStatusCollector {
+
+	private final HgRepository repo;
+	private final FileWalker repoWalker;
+	private HgDirstate dirstate;
+	private StatusCollector baseRevisionCollector;
+
+	public WorkingCopyStatusCollector(HgRepository hgRepo) {
+		this(hgRepo, hgRepo.createWorkingDirWalker());
+	}
+
+	WorkingCopyStatusCollector(HgRepository hgRepo, FileWalker hgRepoWalker) {
+		this.repo = hgRepo;
+		this.repoWalker = hgRepoWalker;
+	}
+	
+	/**
+	 * Optionally, supply a collector instance that may cache (or have already cached) base revision
+	 * @param sc may be null
+	 */
+	public void setBaseRevisionCollector(StatusCollector sc) {
+		baseRevisionCollector = sc;
+	}
+	
+	private HgDirstate getDirstate() {
+		if (dirstate == null) {
+			dirstate = repo.loadDirstate();
+		}
+		return dirstate;
+	}
+
+	// may be invoked few times
+	public void walk(int baseRevision, StatusCollector.Inspector inspector) {
+		final HgIgnore hgIgnore = repo.loadIgnore();
+		TreeSet<String> knownEntries = getDirstate().all();
+		final boolean isTipBase;
+		if (baseRevision == TIP) {
+			baseRevision = repo.getManifest().getRevisionCount() - 1;
+			isTipBase = true;
+		} else {
+			isTipBase = baseRevision == repo.getManifest().getRevisionCount() - 1;
+		}
+		StatusCollector.ManifestRevisionInspector collect = null;
+		Set<String> baseRevFiles = Collections.emptySet();
+		if (!isTipBase) {
+			if (baseRevisionCollector != null) {
+				collect = baseRevisionCollector.raw(baseRevision);
+			} else {
+				collect = new StatusCollector.ManifestRevisionInspector(baseRevision, baseRevision);
+				repo.getManifest().walk(baseRevision, baseRevision, collect);
+			}
+			baseRevFiles = new TreeSet<String>(collect.files(baseRevision));
+		}
+		if (inspector instanceof StatusCollector.Record) {
+			StatusCollector sc = baseRevisionCollector == null ? new StatusCollector(repo) : baseRevisionCollector;
+			((StatusCollector.Record) inspector).init(baseRevision, BAD_REVISION, sc);
+		}
+		repoWalker.reset();
+		while (repoWalker.hasNext()) {
+			repoWalker.next();
+			String fname = repoWalker.name();
+			File f = repoWalker.file();
+			if (hgIgnore.isIgnored(fname)) {
+				inspector.ignored(fname);
+			} else if (knownEntries.remove(fname)) {
+				// modified, added, removed, clean
+				if (collect != null) { // need to check against base revision, not FS file
+					Nodeid nid1 = collect.nodeid(baseRevision, fname);
+					String flags = collect.flags(baseRevision, fname);
+					checkLocalStatusAgainstBaseRevision(baseRevFiles, nid1, flags, fname, f, inspector);
+					baseRevFiles.remove(fname);
+				} else {
+					checkLocalStatusAgainstFile(fname, f, inspector);
+				}
+			} else {
+				inspector.unknown(fname);
+			}
+		}
+		if (collect != null) {
+			for (String r : baseRevFiles) {
+				inspector.removed(r);
+			}
+		}
+		for (String m : knownEntries) {
+			// missing known file from a working dir  
+			if (getDirstate().checkRemoved(m) == null) {
+				// not removed from the repository = 'deleted'  
+				inspector.missing(m);
+			} else {
+				// removed from the repo
+				inspector.removed(m);
+			}
+		}
+	}
+
+	public StatusCollector.Record status(int baseRevision) {
+		StatusCollector.Record rv = new StatusCollector.Record();
+		walk(baseRevision, rv);
+		return rv;
+	}
+
+	//********************************************
+
+	
+	private void checkLocalStatusAgainstFile(String fname, File f, StatusCollector.Inspector inspector) {
+		HgDirstate.Record r;
+		if ((r = getDirstate().checkNormal(fname)) != null) {
+			// either clean or modified
+			if (f.lastModified() / 1000 == r.time && r.size == f.length()) {
+				inspector.clean(fname);
+			} else {
+				// FIXME check actual content to avoid false modified files
+				inspector.modified(fname);
+			}
+		} else if ((r = getDirstate().checkAdded(fname)) != null) {
+			if (r.name2 == null) {
+				inspector.added(fname);
+			} else {
+				inspector.copied(r.name2, fname);
+			}
+		} else if ((r = getDirstate().checkRemoved(fname)) != null) {
+			inspector.removed(fname);
+		} else if ((r = getDirstate().checkMerged(fname)) != null) {
+			inspector.modified(fname);
+		}
+	}
+	
+	// XXX refactor checkLocalStatus methods in more OO way
+	private void checkLocalStatusAgainstBaseRevision(Set<String> baseRevNames, Nodeid nid1, String flags, String fname, File f, StatusCollector.Inspector inspector) {
+		// fname is in the dirstate, either Normal, Added, Removed or Merged
+		HgDirstate.Record r;
+		if (nid1 == null) {
+			// normal: added?
+			// added: not known at the time of baseRevision, shall report
+			// merged: was not known, report as added?
+			if ((r = getDirstate().checkAdded(fname)) != null) {
+				if (r.name2 != null && baseRevNames.contains(r.name2)) {
+					baseRevNames.remove(r.name2);
+					inspector.copied(r.name2, fname);
+					return;
+				}
+				// fall-through, report as added
+			} else if (getDirstate().checkRemoved(fname) != null) {
+				// removed: removed file was not known at the time of baseRevision, and we should not report it as removed
+				return;
+			}
+			inspector.added(fname);
+		} else {
+			// was known; check whether clean or modified
+			// when added - seems to be the case of a file added once again, hence need to check if content is different
+			if ((r = getDirstate().checkNormal(fname)) != null || (r = getDirstate().checkMerged(fname)) != null || (r = getDirstate().checkAdded(fname)) != null) {
+				// either clean or modified
+				HgDataFile fileNode = repo.getFileNode(fname);
+				final int lengthAtRevision = fileNode.length(nid1);
+				if (r.size /* XXX File.length() ?! */ != lengthAtRevision || flags != todoGenerateFlags(fname /*java.io.File*/)) {
+					inspector.modified(fname);
+				} else {
+					// check actual content to see actual changes
+					// XXX consider adding HgDataDile.compare(File/byte[]/whatever) operation to optimize comparison
+					if (areTheSame(f, fileNode.content(nid1))) {
+						inspector.clean(fname);
+					} else {
+						inspector.modified(fname);
+					}
+				}
+			}
+			// only those left in idsMap after processing are reported as removed 
+		}
+
+		// TODO think over if content comparison may be done more effectively by e.g. calculating nodeid for a local file and comparing it with nodeid from manifest
+		// we don't need to tell exact difference, hash should be enough to detect difference, and it doesn't involve reading historical file content, and it's relatively 
+		// cheap to calc hash on a file (no need to keep it completely in memory). OTOH, if I'm right that the next approach is used for nodeids: 
+		// changeset nodeid + hash(actual content) => entry (Nodeid) in the next Manifest
+		// then it's sufficient to check parents from dirstate, and if they do not match parents from file's baseRevision (non matching parents means different nodeids).
+		// The question is whether original Hg treats this case (same content, different parents and hence nodeids) as 'modified' or 'clean'
+	}
+
+	private static String todoGenerateFlags(String fname) {
+		// FIXME implement
+		return null;
+	}
+	private static boolean areTheSame(File f, byte[] data) {
+		try {
+			BufferedInputStream is = new BufferedInputStream(new FileInputStream(f));
+			int i = 0;
+			while (i < data.length && data[i] == is.read()) {
+				i++; // increment only for successful match, otherwise won't tell last byte in data was the same as read from the stream
+			}
+			return i == data.length && is.read() == -1; // although data length is expected to be the same (see caller), check that we reached EOF, no more data left.
+		} catch (IOException ex) {
+			ex.printStackTrace(); // log warn
+		}
+		return false;
+	}
+
+}