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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 com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import java.io.IOException;
import java.nio.file.attribute.AclEntry;
import java.nio.file.attribute.AclFileAttributeView;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.attribute.FileOwnerAttributeView;
import java.nio.file.attribute.UserPrincipal;
import java.util.List;
import java.util.Map;
import org.checkerframework.checker.nullness.compatqual.NullableDecl;
/**
* Attribute provider that provides the {@link AclFileAttributeView} ("acl").
*
* @author Colin Decker
*/
final class AclAttributeProvider extends AttributeProvider {
private static final ImmutableSet<String> ATTRIBUTES = ImmutableSet.of("acl");
private static final ImmutableSet<String> INHERITED_VIEWS = ImmutableSet.of("owner");
private static final ImmutableList<AclEntry> DEFAULT_ACL = ImmutableList.of();
@Override
public String name() {
return "acl";
}
@Override
public ImmutableSet<String> inherits() {
return INHERITED_VIEWS;
}
@Override
public ImmutableSet<String> fixedAttributes() {
return ATTRIBUTES;
}
@Override
public ImmutableMap<String, ?> defaultValues(Map<String, ?> userProvidedDefaults) {
Object userProvidedAcl = userProvidedDefaults.get("acl:acl");
ImmutableList<AclEntry> acl = DEFAULT_ACL;
if (userProvidedAcl != null) {
acl = toAcl(checkType("acl", "acl", userProvidedAcl, List.class));
}
return ImmutableMap.of("acl:acl", acl);
}
@NullableDecl
@Override
public Object get(File file, String attribute) {
if (attribute.equals("acl")) {
return file.getAttribute("acl", "acl");
}
return null;
}
@Override
public void set(File file, String view, String attribute, Object value, boolean create) {
if (attribute.equals("acl")) {
checkNotCreate(view, attribute, create);
file.setAttribute("acl", "acl", toAcl(checkType(view, attribute, value, List.class)));
}
}
@SuppressWarnings("unchecked") // only cast after checking each element's type
private static ImmutableList<AclEntry> toAcl(List<?> list) {
ImmutableList<?> copy = ImmutableList.copyOf(list);
for (Object obj : copy) {
if (!(obj instanceof AclEntry)) {
throw new IllegalArgumentException(
"invalid element for attribute 'acl:acl': should be List<AclEntry>, "
+ "found element of type "
+ obj.getClass());
}
}
return (ImmutableList<AclEntry>) copy;
}
@Override
public Class<AclFileAttributeView> viewType() {
return AclFileAttributeView.class;
}
@Override
public AclFileAttributeView view(
FileLookup lookup, ImmutableMap<String, FileAttributeView> inheritedViews) {
return new View(lookup, (FileOwnerAttributeView) inheritedViews.get("owner"));
}
/** Implementation of {@link AclFileAttributeView}. */
private static final class View extends AbstractAttributeView implements AclFileAttributeView {
private final FileOwnerAttributeView ownerView;
public View(FileLookup lookup, FileOwnerAttributeView ownerView) {
super(lookup);
this.ownerView = checkNotNull(ownerView);
}
@Override
public String name() {
return "acl";
}
@SuppressWarnings("unchecked")
@Override
public List<AclEntry> getAcl() throws IOException {
return (List<AclEntry>) lookupFile().getAttribute("acl", "acl");
}
@Override
public void setAcl(List<AclEntry> acl) throws IOException {
checkNotNull(acl);
lookupFile().setAttribute("acl", "acl", ImmutableList.copyOf(acl));
}
@Override
public UserPrincipal getOwner() throws IOException {
return ownerView.getOwner();
}
@Override
public void setOwner(UserPrincipal owner) throws IOException {
ownerView.setOwner(owner);
}
}
}
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