/*

 * 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

 * particular file as subject to the "Classpath" exception as provided

 *

 * 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.

 *

 */

package sun.nio.fs;

import java.nio.file.*;

import java.io.IOException;

/**

 * 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 new String(UnixNativeDispatcher.strerror(errno()));

        }

    }

    @Override

    public String getMessage() {

        return errorString();

    }

    /**

     * 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);

        // fallback to the more general exception

        return new FileSystemException(file, other, errorString());

    }

    void rethrowAsIOException(String file) throws IOException {

        IOException x = translateToIOException(file, null);

        throw x;

    }

    void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException {

        String a = (file == null) ? null : file.getPathForExecptionMessage();

        String b = (other == null) ? null : other.getPathForExecptionMessage();

        IOException x = translateToIOException(a, b);

        throw x;

    }

    void rethrowAsIOException(UnixPath file) throws IOException {

        rethrowAsIOException(file, null);

    }

    IOException asIOException(UnixPath file) {

        return translateToIOException(file.getPathForExecptionMessage(), null);

    }

}