| /* |
| * Copyright (c) 2011, 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.Path; |
| import java.nio.file.LinkOption; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.nio.file.spi.FileSystemProvider; |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * Base implementation class of FileSystemProvider |
| */ |
| |
| public abstract class AbstractFileSystemProvider extends FileSystemProvider { |
| protected AbstractFileSystemProvider() { } |
| |
| /** |
| * Splits the given attribute name into the name of an attribute view and |
| * the attribute. If the attribute view is not identified then it assumed |
| * to be "basic". |
| */ |
| private static String[] split(String attribute) { |
| String[] s = new String[2]; |
| int pos = attribute.indexOf(':'); |
| if (pos == -1) { |
| s[0] = "basic"; |
| s[1] = attribute; |
| } else { |
| s[0] = attribute.substring(0, pos++); |
| s[1] = (pos == attribute.length()) ? "" : attribute.substring(pos); |
| } |
| return s; |
| } |
| |
| /** |
| * Gets a DynamicFileAttributeView by name. Returns {@code null} if the |
| * view is not available. |
| */ |
| abstract DynamicFileAttributeView getFileAttributeView(Path file, |
| String name, |
| LinkOption... options); |
| |
| @Override |
| public final void setAttribute(Path file, |
| String attribute, |
| Object value, |
| LinkOption... options) |
| throws IOException |
| { |
| String[] s = split(attribute); |
| if (s[0].length() == 0) |
| throw new IllegalArgumentException(attribute); |
| DynamicFileAttributeView view = getFileAttributeView(file, s[0], options); |
| if (view == null) |
| throw new UnsupportedOperationException("View '" + s[0] + "' not available"); |
| view.setAttribute(s[1], value); |
| } |
| |
| @Override |
| public final Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options) |
| throws IOException |
| { |
| String[] s = split(attributes); |
| if (s[0].length() == 0) |
| throw new IllegalArgumentException(attributes); |
| DynamicFileAttributeView view = getFileAttributeView(file, s[0], options); |
| if (view == null) |
| throw new UnsupportedOperationException("View '" + s[0] + "' not available"); |
| return view.readAttributes(s[1].split(",")); |
| } |
| |
| /** |
| * Deletes a file. The {@code failIfNotExists} parameters determines if an |
| * {@code IOException} is thrown when the file does not exist. |
| */ |
| abstract boolean implDelete(Path file, boolean failIfNotExists) throws IOException; |
| |
| @Override |
| public final void delete(Path file) throws IOException { |
| implDelete(file, true); |
| } |
| |
| @Override |
| public final boolean deleteIfExists(Path file) throws IOException { |
| return implDelete(file, false); |
| } |
| |
| /** |
| * Tests whether a file is a directory. |
| * |
| * @return {@code true} if the file is a directory; {@code false} if |
| * the file does not exist, is not a directory, or it cannot |
| * be determined if the file is a directory or not. |
| */ |
| public boolean isDirectory(Path file) { |
| try { |
| return readAttributes(file, BasicFileAttributes.class).isDirectory(); |
| } catch (IOException ioe) { |
| return false; |
| } |
| } |
| |
| /** |
| * Tests whether a file is a regular file with opaque content. |
| * |
| * @return {@code true} if the file is a regular file; {@code false} if |
| * the file does not exist, is not a regular file, or it |
| * cannot be determined if the file is a regular file or not. |
| */ |
| public boolean isRegularFile(Path file) { |
| try { |
| return readAttributes(file, BasicFileAttributes.class).isRegularFile(); |
| } catch (IOException ioe) { |
| return false; |
| } |
| } |
| |
| /** |
| * Checks the existence of a file. |
| * |
| * @return {@code true} if the file exists; {@code false} if the file does |
| * not exist or its existence cannot be determined. |
| */ |
| public boolean exists(Path file) { |
| try { |
| checkAccess(file); |
| return true; |
| } catch (IOException ioe) { |
| return false; |
| } |
| } |
| } |