Java example source code file (FileSystemException.java)

This example Java source code file (FileSystemException.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

filesystemexception, ioexception, override, string, stringbuilder

The FileSystemException.java Java example source code

/*
 * Copyright (c) 2007, 2009, 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 java.nio.file;

import java.io.IOException;

/**
 * Thrown when a file system operation fails on one or two files. This class is
 * the general class for file system exceptions.
 *
 * @since 1.7
 */

public class FileSystemException
    extends IOException
{
    static final long serialVersionUID = -3055425747967319812L;

    private final String file;
    private final String other;

    /**
     * Constructs an instance of this class. This constructor should be used
     * when an operation involving one file fails and there isn't any additional
     * information to explain the reason.
     *
     * @param   file
     *          a string identifying the file or {@code null} if not known.
     */
    public FileSystemException(String file) {
        super((String)null);
        this.file = file;
        this.other = null;
    }

    /**
     * Constructs an instance of this class. This constructor should be used
     * when an operation involving two files fails, or there is additional
     * information to explain the reason.
     *
     * @param   file
     *          a string identifying the file or {@code null} if not known.
     * @param   other
     *          a string identifying the other file or {@code null} if there
     *          isn't another file or if not known
     * @param   reason
     *          a reason message with additional information or {@code null}
     */
    public FileSystemException(String file, String other, String reason) {
        super(reason);
        this.file = file;
        this.other = other;
    }

    /**
     * Returns the file used to create this exception.
     *
     * @return  the file (can be {@code null})
     */
    public String getFile() {
        return file;
    }

    /**
     * Returns the other file used to create this exception.
     *
     * @return  the other file (can be {@code null})
     */
    public String getOtherFile() {
        return other;
    }

    /**
     * Returns the string explaining why the file system operation failed.
     *
     * @return  the string explaining why the file system operation failed
     */
    public String getReason() {
        return super.getMessage();
    }

    /**
     * Returns the detail message string.
     */
    @Override
    public String getMessage() {
        if (file == null && other == null)
            return getReason();
        StringBuilder sb = new StringBuilder();
        if (file != null)
            sb.append(file);
        if (other != null) {
            sb.append(" -> ");
            sb.append(other);
        }
        if (getReason() != null) {
            sb.append(": ");
            sb.append(getReason());
        }
        return sb.toString();
    }
}