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/*
* 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.*;
import java.nio.file.spi.FileSystemProvider;
import java.io.IOException;
import java.util.Map;
/**
* Base implementation class of FileSystemProvider
*/
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);
}
}
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