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annotate src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 215:41a778e3fd31

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Issue 5: Facilities for progress and cancellation. More specific exceptions. Exceptions from callbacks as RuntimeException
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 17 May 2011 00:56:54 +0200
parents
children c251bbc979cf
rev   line source
215
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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 static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20
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21 import org.tmatesoft.hg.repo.HgRepository;
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22 import org.tmatesoft.hg.util.Path;
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23
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24 /**
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25 * Checked exception that indicates errors in client code and tries to supply extra information about the context it occured in.
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26 *
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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 @SuppressWarnings("serial")
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31 public class HgCallbackTargetException extends HgException {
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32 private int revNumber = BAD_REVISION;
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33 private Nodeid revision;
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34 private Path filename;
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35
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36 /**
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37 * @param cause can't be <code>null</code>
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38 */
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39 public HgCallbackTargetException(Throwable cause) {
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40 super((Throwable) null);
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41 if (cause == null) {
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42 throw new IllegalArgumentException();
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43 }
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44 if (cause.getClass() == Wrap.class) {
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45 // eliminate wrapper
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46 initCause(cause.getCause());
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47 } else {
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48 initCause(cause);
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49 }
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50 }
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51
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52 /**
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53 * @return not {@link HgRepository#BAD_REVISION} only when local revision number was supplied at the construction time
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54 */
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55 public int getRevisionNumber() {
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56 return revNumber;
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57 }
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58
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59 public HgCallbackTargetException setRevisionNumber(int rev) {
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60 revNumber = rev;
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61 return this;
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62 }
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63
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64 /**
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65 * @return non-null only when revision was supplied at construction time
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66 */
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67 public Nodeid getRevision() {
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68 return revision;
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69 }
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70
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71 public HgCallbackTargetException setRevision(Nodeid r) {
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72 revision = r;
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73 return this;
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74 }
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75
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76 /**
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77 * @return non-null only if file name was set at construction time
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78 */
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79 public Path getFileName() {
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80 return filename;
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81 }
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82
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83 public HgCallbackTargetException setFileName(Path name) {
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84 filename = name;
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85 return this;
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86 }
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87
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88 @SuppressWarnings("unchecked")
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89 public <T extends Exception> T getTargetException() {
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90 return (T) getCause();
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91 }
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92
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93 /**
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94 * Despite this exception is merely a way to give users access to their own exceptions, it may still supply
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95 * valuable debugging information about what led to the error.
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96 */
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97 @Override
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98 public String getMessage() {
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99 StringBuilder sb = new StringBuilder();
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100 if (filename != null) {
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101 sb.append(filename);
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102 sb.append(':');
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103 sb.append(' ');
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104 }
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105 if (revNumber != BAD_REVISION) {
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106 sb.append(revNumber);
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107 if (revision != null) {
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108 sb.append(':');
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109 }
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110 }
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111 if (revision != null) {
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112 sb.append(revision.shortNotation());
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113 }
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114 return sb.toString();
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115 }
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116
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117 /**
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118 * Given the approach high-level handlers throw RuntimeExceptions to indicate errors, and
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119 * a need to throw reasonable checked exception from client code, clients may utilize this class
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120 * to get their checked exceptions unwrapped by {@link HgCallbackTargetException} and serve as that
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121 * exception cause, eliminating {@link RuntimeException} mediator.
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122 */
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123 public static final class Wrap extends RuntimeException {
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124
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125 public Wrap(Throwable cause) {
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126 super(cause);
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127 if (cause == null) {
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128 throw new IllegalArgumentException();
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129 }
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130 }
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131 }
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132 }