diff options
Diffstat (limited to 'jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java')
-rw-r--r-- | jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java b/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java new file mode 100644 index 0000000..3408639 --- /dev/null +++ b/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java @@ -0,0 +1,123 @@ +/* + * 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)); + } + } +} |