tikhomirov@38: /*
tikhomirov@38:  * Copyright (c) 2010, 2011 Artem Tikhomirov 
tikhomirov@0:  */
tikhomirov@0: package com.tmate.hgkit.ll;
tikhomirov@0: 
tikhomirov@0: import java.io.UnsupportedEncodingException;
tikhomirov@0: import java.util.ArrayList;
tikhomirov@47: import java.util.Collections;
tikhomirov@40: import java.util.Date;
tikhomirov@47: import java.util.Formatter;
tikhomirov@47: import java.util.List;
tikhomirov@40: import java.util.Locale;
tikhomirov@47: import java.util.Map;
tikhomirov@0: 
tikhomirov@0: /**
tikhomirov@0:  * @see mercurial/changelog.py:read()
tikhomirov@0:  * <pre>
tikhomirov@0:         format used:
tikhomirov@0:         nodeid\n        : manifest node in ascii
tikhomirov@0:         user\n          : user, no \n or \r allowed
tikhomirov@0:         time tz extra\n : date (time is int or float, timezone is int)
tikhomirov@0:                         : extra is metadatas, encoded and separated by '\0'
tikhomirov@0:                         : older versions ignore it
tikhomirov@0:         files\n\n       : files modified by the cset, no \n or \r allowed
tikhomirov@0:         (.*)            : comment (free text, ideally utf-8)
tikhomirov@0: 
tikhomirov@0:         changelog v0 doesn't use extra
tikhomirov@0:  * </pre>
tikhomirov@0:  * @author artem
tikhomirov@0:  */
tikhomirov@47: public class Changeset implements Cloneable /*for those that would like to keep a copy*/ {
tikhomirov@3: 	// TODO immutable
tikhomirov@38: 	private /*final*/ Nodeid manifest;
tikhomirov@0: 	private String user;
tikhomirov@0: 	private String comment;
tikhomirov@47: 	private List<String> files; // unmodifiable collection (otherwise #files() and implicit #clone() shall be revised)
tikhomirov@40: 	private Date time;
tikhomirov@47: 	private int timezone; // not sure it's of any use
tikhomirov@40: 	private String extras; // TODO branch, etc.
tikhomirov@0: 	
tikhomirov@47: 	private Changeset() {
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	public Nodeid manifest() {
tikhomirov@47: 		return manifest;
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	public String user() {
tikhomirov@47: 		return user;
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	public String comment() {
tikhomirov@47: 		return comment;
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	public List<String> files() {
tikhomirov@47: 		return files;
tikhomirov@47: 	}
tikhomirov@47: 
tikhomirov@47: 	public Date date() {
tikhomirov@47: 		return time;
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	public String dateString() {
tikhomirov@47: 		StringBuilder sb = new StringBuilder(30);
tikhomirov@47: 		Formatter f = new Formatter(sb, Locale.US);
tikhomirov@47: 		f.format("%ta %<tb %<td %<tH:%<tM:%<tS %<tY %<tz", time);
tikhomirov@47: 		return sb.toString();
tikhomirov@47: 	}
tikhomirov@47: 
tikhomirov@47: 	public Map<String, String> extras() {
tikhomirov@47: 		return null; // TODO
tikhomirov@47: 	}
tikhomirov@47: 	
tikhomirov@47: 	@Override
tikhomirov@47: 	public String toString() {
tikhomirov@47: 		StringBuilder sb = new StringBuilder();
tikhomirov@47: 		sb.append("Changeset {");
tikhomirov@47: 		sb.append("User: ").append(user).append(", ");
tikhomirov@47: 		sb.append("Comment: ").append(comment).append(", ");
tikhomirov@47: 		sb.append("Manifest: ").append(manifest).append(", ");
tikhomirov@47: 		sb.append("Date: ").append(time).append(", ");
tikhomirov@47: 		sb.append("Files: ").append(files.size());
tikhomirov@47: 		for (String s : files) {
tikhomirov@47: 			sb.append(", ").append(s);
tikhomirov@47: 		}
tikhomirov@40: 		if (extras != null) {
tikhomirov@47: 			sb.append(", Extra: ").append(extras);
tikhomirov@40: 		}
tikhomirov@47: 		sb.append("}");
tikhomirov@47: 		return sb.toString();
tikhomirov@0: 	}
tikhomirov@0: 
tikhomirov@3: 	public static Changeset parse(byte[] data, int offset, int length) {
tikhomirov@3: 		Changeset rv = new Changeset();
tikhomirov@5: 		rv.init(data, offset, length);
tikhomirov@5: 		return rv;
tikhomirov@5: 	}
tikhomirov@5: 
tikhomirov@5: 	/*package-local*/ void init(byte[] data, int offset, int length) {
tikhomirov@0: 		final int bufferEndIndex = offset + length;
tikhomirov@0: 		final byte lineBreak = (byte) '\n';
tikhomirov@3: 		int breakIndex1 = indexOf(data, lineBreak, offset, bufferEndIndex);
tikhomirov@0: 		if (breakIndex1 == -1) {
tikhomirov@0: 			throw new IllegalArgumentException("Bad Changeset data");
tikhomirov@0: 		}
tikhomirov@5: 		Nodeid _nodeid = Nodeid.fromAscii(data, 0, breakIndex1);
tikhomirov@3: 		int breakIndex2 = indexOf(data, lineBreak, breakIndex1+1, bufferEndIndex);
tikhomirov@0: 		if (breakIndex2 == -1) {
tikhomirov@0: 			throw new IllegalArgumentException("Bad Changeset data");
tikhomirov@0: 		}
tikhomirov@5: 		String _user = new String(data, breakIndex1+1, breakIndex2 - breakIndex1 - 1);
tikhomirov@3: 		int breakIndex3 = indexOf(data, lineBreak, breakIndex2+1, bufferEndIndex);
tikhomirov@0: 		if (breakIndex3 == -1) {
tikhomirov@0: 			throw new IllegalArgumentException("Bad Changeset data");
tikhomirov@0: 		}
tikhomirov@40: 		String _timeString = new String(data, breakIndex2+1, breakIndex3 - breakIndex2 - 1);
tikhomirov@40: 		int space1 = _timeString.indexOf(' ');
tikhomirov@40: 		if (space1 == -1) {
tikhomirov@40: 			throw new IllegalArgumentException("Bad Changeset data");
tikhomirov@40: 		}
tikhomirov@40: 		int space2 = _timeString.indexOf(' ', space1+1);
tikhomirov@40: 		if (space2 == -1) {
tikhomirov@40: 			space2 = _timeString.length();
tikhomirov@40: 		}
tikhomirov@40: 		long unixTime = Long.parseLong(_timeString.substring(0, space1)); // XXX Float, perhaps
tikhomirov@47: 		int _timezone = Integer.parseInt(_timeString.substring(space1+1, space2));
tikhomirov@40: 		// XXX not sure need to add timezone here - I can't figure out whether Hg keeps GMT time, and records timezone just for info, or unixTime is taken local
tikhomirov@40: 		// on commit and timezone is recorded to adjust it to UTC.
tikhomirov@47: 		Date _time = new Date(unixTime * 1000);
tikhomirov@40: 		String _extras = space2 < _timeString.length() ? _timeString.substring(space2+1) : null;
tikhomirov@0: 		
tikhomirov@0: 		//
tikhomirov@0: 		int lastStart = breakIndex3 + 1;
tikhomirov@3: 		int breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
tikhomirov@5: 		ArrayList<String> _files = new ArrayList<String>(5);
tikhomirov@0: 		while (breakIndex4 != -1 && breakIndex4 + 1 < bufferEndIndex) {
tikhomirov@5: 			_files.add(new String(data, lastStart, breakIndex4 - lastStart));
tikhomirov@0: 			lastStart = breakIndex4 + 1;
tikhomirov@3: 			if (data[breakIndex4 + 1] == lineBreak) {
tikhomirov@0: 				// found \n\n
tikhomirov@0: 				break;
tikhomirov@0: 			} else {
tikhomirov@3: 				breakIndex4 = indexOf(data, lineBreak, lastStart, bufferEndIndex);
tikhomirov@0: 			}
tikhomirov@0: 		}
tikhomirov@0: 		if (breakIndex4 == -1 || breakIndex4 >= bufferEndIndex) {
tikhomirov@0: 			throw new IllegalArgumentException("Bad Changeset data");
tikhomirov@0: 		}
tikhomirov@5: 		String _comment;
tikhomirov@0: 		try {
tikhomirov@5: 			_comment = new String(data, breakIndex4+2, bufferEndIndex - breakIndex4 - 2, "UTF-8");
tikhomirov@0: 		} catch (UnsupportedEncodingException ex) {
tikhomirov@5: 			_comment = "";
tikhomirov@0: 			throw new IllegalStateException("Could hardly happen");
tikhomirov@0: 		}
tikhomirov@5: 		// change this instance at once, don't leave it partially changes in case of error
tikhomirov@38: 		this.manifest = _nodeid;
tikhomirov@5: 		this.user = _user;
tikhomirov@40: 		this.time = _time;
tikhomirov@47: 		this.timezone = _timezone;
tikhomirov@47: 		this.files = Collections.unmodifiableList(_files);
tikhomirov@5: 		this.comment = _comment;
tikhomirov@40: 		this.extras = _extras;
tikhomirov@0: 	}
tikhomirov@0: 
tikhomirov@0: 	private static int indexOf(byte[] src, byte what, int startOffset, int endIndex) {
tikhomirov@0: 		for (int i = startOffset; i < endIndex; i++) {
tikhomirov@0: 			if (src[i] == what) {
tikhomirov@0: 				return i;
tikhomirov@0: 			}
tikhomirov@0: 		}
tikhomirov@0: 		return -1;
tikhomirov@0: 	}
tikhomirov@2: 
tikhomirov@3: 	public interface Inspector {
tikhomirov@2: 		// first(), last(), single().
tikhomirov@2: 		// <T>
tikhomirov@47: 		// TODO describe whether cset is new instance each time
tikhomirov@47: 		void next(int revisionNumber, Nodeid nodeid, Changeset cset);
tikhomirov@2: 	}
tikhomirov@0: }