| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.google.common.jimfs; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.jimfs.UserLookupService.createUserPrincipal; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableSet; |
| |
| import java.io.IOException; |
| import java.nio.file.attribute.FileAttributeView; |
| import java.nio.file.attribute.FileOwnerAttributeView; |
| import java.nio.file.attribute.UserPrincipal; |
| import java.util.Map; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * Attribute provider that provides the {@link FileOwnerAttributeView} ("owner"). |
| * |
| * @author Colin Decker |
| */ |
| final class OwnerAttributeProvider extends AttributeProvider { |
| |
| private static final ImmutableSet<String> ATTRIBUTES = ImmutableSet.of("owner"); |
| |
| private static final UserPrincipal DEFAULT_OWNER = createUserPrincipal("user"); |
| |
| @Override |
| public String name() { |
| return "owner"; |
| } |
| |
| @Override |
| public ImmutableSet<String> fixedAttributes() { |
| return ATTRIBUTES; |
| } |
| |
| @Override |
| public ImmutableMap<String, ?> defaultValues(Map<String, ?> userProvidedDefaults) { |
| Object userProvidedOwner = userProvidedDefaults.get("owner:owner"); |
| |
| UserPrincipal owner = DEFAULT_OWNER; |
| if (userProvidedOwner != null) { |
| if (userProvidedOwner instanceof String) { |
| owner = createUserPrincipal((String) userProvidedOwner); |
| } else { |
| throw invalidType("owner", "owner", userProvidedOwner, String.class, UserPrincipal.class); |
| } |
| } |
| |
| return ImmutableMap.of("owner:owner", owner); |
| } |
| |
| @Nullable |
| @Override |
| public Object get(File file, String attribute) { |
| if (attribute.equals("owner")) { |
| return file.getAttribute("owner", "owner"); |
| } |
| return null; |
| } |
| |
| @Override |
| public void set(File file, String view, String attribute, Object value, boolean create) { |
| if (attribute.equals("owner")) { |
| UserPrincipal user = checkType(view, attribute, value, UserPrincipal.class); |
| // TODO(cgdecker): Do we really need to do this? Any reason not to allow any UserPrincipal? |
| if (!(user instanceof UserLookupService.JimfsUserPrincipal)) { |
| user = createUserPrincipal(user.getName()); |
| } |
| file.setAttribute("owner", "owner", user); |
| } |
| } |
| |
| @Override |
| public Class<FileOwnerAttributeView> viewType() { |
| return FileOwnerAttributeView.class; |
| } |
| |
| @Override |
| public FileOwnerAttributeView view( |
| FileLookup lookup, ImmutableMap<String, FileAttributeView> inheritedViews) { |
| return new View(lookup); |
| } |
| |
| /** |
| * Implementation of {@link FileOwnerAttributeView}. |
| */ |
| private static final class View extends AbstractAttributeView implements FileOwnerAttributeView { |
| |
| public View(FileLookup lookup) { |
| super(lookup); |
| } |
| |
| @Override |
| public String name() { |
| return "owner"; |
| } |
| |
| @Override |
| public UserPrincipal getOwner() throws IOException { |
| return (UserPrincipal) lookupFile().getAttribute("owner", "owner"); |
| } |
| |
| @Override |
| public void setOwner(UserPrincipal owner) throws IOException { |
| lookupFile().setAttribute("owner", "owner", checkNotNull(owner)); |
| } |
| } |
| } |