Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents b9e5ac26dd83
children
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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.core;
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19 import org.tmatesoft.hg.internal.ExceptionInfo;
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20 import org.tmatesoft.hg.util.Path;
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24 /**
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25 * Checked exception that client supplied callback code can use to indicates its own errors.
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26 *
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27 * <p>Generally, client need to pass own error information/exceptions from within implementations of the callback methods they supply.
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28 * However, there's no straightforward way to alter throws clause for these methods, and alternatives like generic {@link Exception} or
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29 * library's own {@link HgException} are rather obscure. Suggested approach is to wrap whatever exception user code produces with
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30 * {@link HgCallbackTargetException}, the only checked exception allowed out from a callback.
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31 *
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32 * <p>It's intentionally not a subclass of {@link HgException} to avoid get mixed with library own errors and be processed separately.
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33 *
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34 * <p>Top-level API handlers ({@link HgStatusHandler}, {@link HgManifestHandler}, {@link HgChangesetHandler}, etc) allow to throw
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35 * HgCallbackTargetException from their methods. Exceptions thrown this way are not handled in corresponding commands, except for
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36 * revision or file name specification, unless already set. Then, these exceptions go straight to the command caller.
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37 *
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38 * @author Artem Tikhomirov
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39 * @author TMate Software Ltd.
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40 */
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41 @SuppressWarnings("serial")
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42 public class HgCallbackTargetException extends Exception {
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44 protected final ExceptionInfo<HgCallbackTargetException> details = new ExceptionInfo<HgCallbackTargetException>(this);
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46 /**
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47 * @param cause can't be <code>null</code>
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48 */
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49 public HgCallbackTargetException(Throwable cause) {
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50 super((String) null);
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51 if (cause == null) {
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52 throw new IllegalArgumentException();
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53 }
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54 initCause(cause);
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55 }
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57 @SuppressWarnings("unchecked")
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58 public <T extends Throwable> T getTargetException() {
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59 return (T) getCause();
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60 }
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62 /**
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63 * Despite this exception is merely a way to give users access to their own exceptions, it may still supply
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64 * valuable debugging information about what led to the error.
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65 */
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66 @Override
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67 public String getMessage() {
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68 StringBuilder sb = new StringBuilder();
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69 sb.append("Error from callback. Original exception thrown: ");
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70 sb.append(getCause().getClass().getName());
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71 sb.append(" at ");
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72 details.appendDetails(sb);
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73 return sb.toString();
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74 }
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75
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76 public HgCallbackTargetException setRevision(Nodeid r) {
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77 return details.setRevision(r);
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78 }
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80 public HgCallbackTargetException setRevisionIndex(int rev) {
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81 return details.setRevisionIndex(rev);
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82 }
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84 public HgCallbackTargetException setFileName(Path name) {
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85 return details.setFileName(name);
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86 }
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87 }