Mercurial > jhg
view src/org/tmatesoft/hg/core/HgCallbackTargetException.java @ 228:fffe4f882248
NPE when directory doesn't exist
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Fri, 27 May 2011 03:01:26 +0200 |
parents | c251bbc979cf |
children | 6d1804fe0ed7 |
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/* * Copyright (c) 2011 TMate Software Ltd * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * For information on how to redistribute this software under * the terms of a license other than GNU General Public License * contact TMate Software at support@hg4j.com */ package org.tmatesoft.hg.core; import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION; import org.tmatesoft.hg.repo.HgRepository; import org.tmatesoft.hg.util.Path; /** * Checked exception that indicates errors in client code and tries to supply extra information about the context it occured in. * * @author Artem Tikhomirov * @author TMate Software Ltd. */ @SuppressWarnings("serial") public class HgCallbackTargetException extends HgException { private int revNumber = BAD_REVISION; private Nodeid revision; private Path filename; /** * @param cause can't be <code>null</code> */ public HgCallbackTargetException(Throwable cause) { super((String) null); if (cause == null) { throw new IllegalArgumentException(); } if (cause.getClass() == Wrap.class) { // eliminate wrapper initCause(cause.getCause()); } else { initCause(cause); } } /** * @return not {@link HgRepository#BAD_REVISION} only when local revision number was supplied at the construction time */ public int getRevisionNumber() { return revNumber; } public HgCallbackTargetException setRevisionNumber(int rev) { revNumber = rev; return this; } /** * @return non-null only when revision was supplied at construction time */ public Nodeid getRevision() { return revision; } public HgCallbackTargetException setRevision(Nodeid r) { revision = r; return this; } /** * @return non-null only if file name was set at construction time */ public Path getFileName() { return filename; } public HgCallbackTargetException setFileName(Path name) { filename = name; return this; } @SuppressWarnings("unchecked") public <T extends Exception> T getTargetException() { return (T) getCause(); } /** * Despite this exception is merely a way to give users access to their own exceptions, it may still supply * valuable debugging information about what led to the error. */ @Override public String getMessage() { StringBuilder sb = new StringBuilder(); if (filename != null) { sb.append(filename); sb.append(':'); sb.append(' '); } if (revNumber != BAD_REVISION) { sb.append(revNumber); if (revision != null) { sb.append(':'); } } if (revision != null) { sb.append(revision.shortNotation()); } return sb.toString(); } /** * Given the approach high-level handlers throw RuntimeExceptions to indicate errors, and * a need to throw reasonable checked exception from client code, clients may utilize this class * to get their checked exceptions unwrapped by {@link HgCallbackTargetException} and serve as that * exception cause, eliminating {@link RuntimeException} mediator. */ public static final class Wrap extends RuntimeException { public Wrap(Throwable cause) { super(cause); if (cause == null) { throw new IllegalArgumentException(); } } } }