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annotate src/org/tmatesoft/hg/internal/EncodingHelper.java @ 447:056f724bdc21 smartgit3

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Cache earliest phase root revision not to evaluate all the time
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 06 Jun 2012 20:11:17 +0200
parents 63c5a9d7ca3f
children ee8264d80747
rev   line source
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1 /*
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2 * Copyright (c) 2011-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.internal;
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18
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19 import java.nio.ByteBuffer;
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20 import java.nio.charset.CharacterCodingException;
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21 import java.nio.charset.Charset;
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22 import java.nio.charset.CharsetDecoder;
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23 import java.nio.charset.CharsetEncoder;
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24
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25 /**
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26 * Keep all encoding-related issues in the single place
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27 * @author Artem Tikhomirov
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28 * @author TMate Software Ltd.
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29 */
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30 public class EncodingHelper {
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31 // XXX perhaps, shall not be full of statics, but rather an instance coming from e.g. HgRepository?
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32 /*
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33 * To understand what Mercurial thinks of UTF-8 and Unix byte approach to names, see
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34 * http://mercurial.808500.n3.nabble.com/Unicode-support-request-td3430704.html
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35 */
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37 private final CharsetEncoder encoder;
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38 private final CharsetDecoder decoder;
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40 EncodingHelper(Charset fsEncoding) {
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41 decoder = fsEncoding.newDecoder();
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42 encoder = fsEncoding.newEncoder();
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43 }
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45 public String fromManifest(byte[] data, int start, int length) {
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46 try {
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47 return decoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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48 } catch (CharacterCodingException ex) {
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49 // resort to system-default
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50 return new String(data, start, length);
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51 }
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52 }
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54 public String fromDirstate(byte[] data, int start, int length) throws CharacterCodingException {
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55 return decoder.decode(ByteBuffer.wrap(data, start, length)).toString();
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56 }
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57
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58 public Charset charset() {
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59 return encoder.charset();
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60 }
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61 }