Mercurial > jhg

annotate src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 450:03fd8d079e9c smartgit3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Share PhasesHelper instance among few HgChangesets (mostly affects HgChangesetTreeHandler case)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 07 Jun 2012 17:06:23 +0200
parents a2341e761609
children f52ca9530774
rev   line source
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1 /*
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2 * Copyright (c) 2011 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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18
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19 import org.tmatesoft.hg.util.Path;
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21
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23 /**
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24 * Checked exception that indicates errors in client code and tries to supply extra information about the context it occurred in.
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25 *
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26 * Generally, client need to pass own error information/exceptions from within implementations of the callback methods they supply.
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27 * However, there's no straightforward way to alter throws clause for these methods, and alternatives like generic {@link Exception} or
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28 * library's own {@link HgException} are rather obscure. Suggested approach is to wrap whatever exception user code produces with
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29 * {@link RuntimeException} subclass, {@link Wrap}. Then, unwrap and re-throw with checked {@link HgCallbackTargetException}.
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30 *
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31 * FIXME REVISIT perhaps, shall just throw HgCallbackTargetException from any handler, and do not catch anything in commands at all?
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32 *
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33 * @author Artem Tikhomirov
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34 * @author TMate Software Ltd.
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35 */
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36 @SuppressWarnings("serial")
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37 public class HgCallbackTargetException extends HgException {
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38 /**
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39 * @param cause can't be <code>null</code>
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40 */
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41 public HgCallbackTargetException(Throwable cause) {
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42 super((String) null);
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43 if (cause == null) {
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44 throw new IllegalArgumentException();
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45 }
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46 if (cause.getClass() == Wrap.class) {
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47 // eliminate wrapper
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48 initCause(cause.getCause());
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49 } else {
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50 initCause(cause);
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51 }
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52 }
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53
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54 @SuppressWarnings("unchecked")
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55 public <T extends Exception> T getTargetException() {
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56 return (T) getCause();
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57 }
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58
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59 /**
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60 * Despite this exception is merely a way to give users access to their own exceptions, it may still supply
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61 * valuable debugging information about what led to the error.
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62 */
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63 @Override
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64 public String getMessage() {
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65 StringBuilder sb = new StringBuilder();
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66 sb.append("Original exception thrown: ");
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67 sb.append(getCause().getClass().getName());
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68 sb.append(" at ");
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69 appendDetails(sb);
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70 return sb.toString();
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71 }
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72
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73 @Override
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74 public HgCallbackTargetException setRevision(Nodeid r) {
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75 return (HgCallbackTargetException) super.setRevision(r);
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76 }
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77 @Override
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78 public HgCallbackTargetException setRevisionIndex(int rev) {
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79 return (HgCallbackTargetException) super.setRevisionIndex(rev);
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80 }
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81 @Override
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82 public HgCallbackTargetException setFileName(Path name) {
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83 return (HgCallbackTargetException) super.setFileName(name);
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84 }
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85
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86 /**
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87 * Given the approach high-level handlers throw RuntimeExceptions to indicate errors, and
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88 * a need to throw reasonable checked exception from client code, clients may utilize this class
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89 * to get their checked exceptions unwrapped by {@link HgCallbackTargetException} and serve as that
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90 * exception cause, eliminating {@link RuntimeException} mediator.
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91 */
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92 public static final class Wrap extends RuntimeException {
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93
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94 public Wrap(Throwable cause) {
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95 super(cause);
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96 if (cause == null) {
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97 throw new IllegalArgumentException();
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98 }
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99 }
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100 }
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101 }