/*

 * Copyright (c) 2007, 2017, 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.attribute;

import java.io.IOException;

/**

 * A file attribute view that provides a view of a <em>basic set</em> of file

 * attributes common to many file systems. The basic set of file attributes

 * consist of <em>mandatory</em> and <em>optional</em> file attributes as

 * defined by the {@link BasicFileAttributes} interface.

 * <p> The file attributes are retrieved from the file system as a <em>bulk

 * operation</em> by invoking the {@link #readAttributes() readAttributes} method.

 * This class also defines the {@link #setTimes setTimes} method to update the

 * file's time attributes.

 *

 * <p> Where dynamic access to file attributes is required, the attributes

 * supported by this attribute view have the following names and types:

 * <blockquote>

 *  <table class="striped">

 *  <caption style="display:none">Supported attributes</caption>

 *  <thead>

 *   <tr>

 *   </tr>

 *  </thead>

 *  <tbody>

 *  <tr>

 *     <td> {@link FileTime} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link FileTime} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link FileTime} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Long} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Boolean} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Boolean} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Boolean} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Boolean} </td>

 *   </tr>

 *   <tr>

 *     <td> {@link Object} </td>

 *   </tr>

 * </tbody>

 * </table>

 * </blockquote>

 *

 * <p> The {@link java.nio.file.Files#getAttribute getAttribute} method may be

 * used to read any of these attributes as if by invoking the {@link

 * #readAttributes() readAttributes()} method.

 *

 * <p> The {@link java.nio.file.Files#setAttribute setAttribute} method may be

 * used to update the file's last modified time, last access time or create time

 * attributes as if by invoking the {@link #setTimes setTimes} method.

 *

 * @since 1.7

 */

public interface BasicFileAttributeView

    extends FileAttributeView

{

    /**

     * Returns the name of the attribute view. Attribute views of this type

     * have the name {@code "basic"}.

     */

    @Override

    String name();

    /**

     * Reads the basic file attributes as a bulk operation.

     *

     * <p> It is implementation specific if all file attributes are read as an

     * atomic operation with respect to other file system operations.

     *

     * @return  the file attributes

     *

     * @throws  IOException

     *          if an I/O error occurs

     * @throws  SecurityException

     *          In the case of the default provider, a security manager is

     *          installed, its {@link SecurityManager#checkRead(String) checkRead}

     *          method is invoked to check read access to the file

     */

    BasicFileAttributes readAttributes() throws IOException;

    /**

     * Updates any or all of the file's last modified time, last access time,

     * and create time attributes.

     *

     * <p> This method updates the file's timestamp attributes. The values are

     * converted to the epoch and precision supported by the file system.

     * Converting from finer to coarser granularities result in precision loss.

     * The behavior of this method when attempting to set a timestamp that is

     * not supported or to a value that is outside the range supported by the

     * underlying file store is not defined. It may or not fail by throwing an

     * {@code IOException}.

     *

     * <p> If any of the {@code lastModifiedTime}, {@code lastAccessTime},

     * or {@code createTime} parameters has the value {@code null} then the

     * corresponding timestamp is not changed. An implementation may require to

     * read the existing values of the file attributes when only some, but not

     * all, of the timestamp attributes are updated. Consequently, this method

     * may not be an atomic operation with respect to other file system

     * operations. Reading and re-writing existing values may also result in

     * precision loss. If all of the {@code lastModifiedTime}, {@code

     * lastAccessTime} and {@code createTime} parameters are {@code null} then

     * this method has no effect.

     *

     * <p> <b>Usage Example:</b>

     * Suppose we want to change a file's last access time.

     * <pre>

     *    Path path = ...

     *    FileTime time = ...

     *    Files.getFileAttributeView(path, BasicFileAttributeView.class).setTimes(null, time, null);

     * </pre>

     *

     * @param   lastModifiedTime

     *          the new last modified time, or {@code null} to not change the

     *          value

     * @param   lastAccessTime

     *          the last access time, or {@code null} to not change the value

     * @param   createTime

     *          the file's create time, or {@code null} to not change the value

     *

     * @throws  IOException

     *          if an I/O error occurs

     * @throws  SecurityException

     *          In the case of the default provider, a security manager is

     *          installed, its  {@link SecurityManager#checkWrite(String) checkWrite}

     *          method is invoked to check write access to the file

     *

     * @see java.nio.file.Files#setLastModifiedTime

     */

    void setTimes(FileTime lastModifiedTime,

                  FileTime lastAccessTime,

                  FileTime createTime) throws IOException;

}