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annotate src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 370:a2341e761609

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Let callback implementations deliver errors (e,g. own exceptions) to client code
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Dec 2011 02:37:10 +0300
parents 2fadf8695f8a
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 }