diff options
Diffstat (limited to 'jimfs/src/main/java/com/google/common/jimfs/AclAttributeProvider.java')
-rw-r--r-- | jimfs/src/main/java/com/google/common/jimfs/AclAttributeProvider.java | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/jimfs/src/main/java/com/google/common/jimfs/AclAttributeProvider.java b/jimfs/src/main/java/com/google/common/jimfs/AclAttributeProvider.java new file mode 100644 index 0000000..1fa0f15 --- /dev/null +++ b/jimfs/src/main/java/com/google/common/jimfs/AclAttributeProvider.java @@ -0,0 +1,155 @@ +/* + * 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); + } + } +} |