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annotate src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 608:e1b29756f901

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Clean, organize and resolve some TODOs and FIXMEs: minor refactorings and comments
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 21:27:51 +0200
parents b9e5ac26dd83
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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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45
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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 }