| /* |
| * 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); |
| } |
| } |
| } |