/*
 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.nio.fs;

import java.nio.file.*;
import java.io.IOException;

Internal exception thrown by native methods when error detected.
/** * Internal exception thrown by native methods when error detected. */
class UnixException extends Exception { static final long serialVersionUID = 7227016794320723218L; private int errno; private String msg; UnixException(int errno) { this.errno = errno; this.msg = null; } UnixException(String msg) { this.errno = 0; this.msg = msg; } int errno() { return errno; } void setError(int errno) { this.errno = errno; this.msg = null; } String errorString() { if (msg != null) { return msg; } else { return Util.toString(UnixNativeDispatcher.strerror(errno())); } } @Override public String getMessage() { return errorString(); } @Override public Throwable fillInStackTrace() { // This is an internal exception; the stack trace is irrelevant. return this; }
Map well known errors to specific exceptions where possible; otherwise return more general FileSystemException.
/** * Map well known errors to specific exceptions where possible; otherwise * return more general FileSystemException. */
private IOException translateToIOException(String file, String other) { // created with message rather than errno if (msg != null) return new IOException(msg); // handle specific cases if (errno() == UnixConstants.EACCES) return new AccessDeniedException(file, other, null); if (errno() == UnixConstants.ENOENT) return new NoSuchFileException(file, other, null); if (errno() == UnixConstants.EEXIST) return new FileAlreadyExistsException(file, other, null); if (errno() == UnixConstants.ELOOP) return new FileSystemException(file, other, errorString() + " or unable to access attributes of symbolic link"); // fallback to the more general exception return new FileSystemException(file, other, errorString()); } void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException { String a = (file == null) ? null : file.getPathForExceptionMessage(); String b = (other == null) ? null : other.getPathForExceptionMessage(); IOException x = translateToIOException(a, b); throw x; } void rethrowAsIOException(UnixPath file) throws IOException { rethrowAsIOException(file, null); } IOException asIOException(UnixPath file) { return translateToIOException(file.getPathForExceptionMessage(), null); } }