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/*
* 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 org.checkerframework.checker.nullness.compatqual.NullableDecl;
/**
* 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);
}
@NullableDecl
@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")) {
checkNotCreate(view, attribute, create);
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));
}
}
}
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