| // Copyright 2014 The Bazel Authors. All rights reserved. |
| // |
| // 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.devtools.build.lib.vfs.inmemoryfs; |
| |
| import com.google.common.base.MoreObjects; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.Collections2; |
| import com.google.devtools.build.lib.clock.Clock; |
| import com.google.devtools.build.lib.concurrent.ThreadSafety; |
| import com.google.devtools.build.lib.vfs.OsPathPolicy; |
| import java.util.Collection; |
| import java.util.HashMap; |
| import java.util.Map; |
| import javax.annotation.Nullable; |
| |
| /** |
| * Represents a directory stored in an {@link InMemoryFileSystem}. |
| * |
| * <p>Not thread-safe. Access should be synchronized from the referencing {@link |
| * InMemoryFileSystem}. |
| */ |
| final class InMemoryDirectoryInfo extends InMemoryContentInfo { |
| |
| private static final boolean CASE_SENSITIVE = OsPathPolicy.getFilePathOs().isCaseSensitive(); |
| |
| // Keys in this map are usually strings, except on case-insensitive operating systems (e.g. |
| // Windows) where we use CaseInsensitiveFilename. |
| private final Map<Object, InMemoryContentInfo> directoryContent = new HashMap<>(); |
| |
| InMemoryDirectoryInfo(Clock clock) { |
| super(clock); |
| setExecutable(true); |
| } |
| |
| /** |
| * Adds a new child to this directory under the given name. Callers must ensure that no entry of |
| * that name exists already. |
| */ |
| void addChild(String name, InMemoryContentInfo inode) { |
| Preconditions.checkNotNull(name); |
| Preconditions.checkNotNull(inode); |
| if (directoryContent.put(key(name), inode) != null) { |
| throw new IllegalArgumentException("File already exists: " + name); |
| } |
| markModificationTime(); |
| } |
| |
| /** |
| * Does a directory lookup, and returns the inode for the specified name, or null if the child is |
| * not found. |
| */ |
| @Nullable |
| InMemoryContentInfo getChild(String name) { |
| return directoryContent.get(key(name)); |
| } |
| |
| /** Removes a previously existing child from the directory specified by this object. */ |
| void removeChild(String name) { |
| if (directoryContent.remove(key(name)) == null) { |
| throw new IllegalArgumentException(name + " is not a member of this directory"); |
| } |
| markModificationTime(); |
| } |
| |
| /** Returns the contents of this directory. */ |
| Collection<String> getAllChildren() { |
| return Collections2.transform( |
| directoryContent.keySet(), |
| CASE_SENSITIVE ? String.class::cast : name -> ((CaseInsensitiveFilename) name).name); |
| } |
| |
| @Override |
| public boolean isDirectory() { |
| return true; |
| } |
| |
| @Override |
| public boolean isSymbolicLink() { |
| return false; |
| } |
| |
| @Override |
| public boolean isFile() { |
| return false; |
| } |
| |
| @Override |
| public boolean isSpecialFile() { |
| return false; |
| } |
| |
| /** |
| * In the InMemory hierarchy, the getSize on a directory always returns the |
| * number of children in the directory. |
| */ |
| @Override |
| public long getSize() { |
| return directoryContent.size(); |
| } |
| |
| @Override |
| InMemoryDirectoryInfo asDirectory() { |
| return this; |
| } |
| |
| private static Object key(String name) { |
| return CASE_SENSITIVE ? name : new CaseInsensitiveFilename(name); |
| } |
| |
| @ThreadSafety.Immutable |
| private static final class CaseInsensitiveFilename { |
| private final String name; |
| |
| private CaseInsensitiveFilename(String name) { |
| this.name = name; |
| } |
| |
| @Override |
| public int hashCode() { |
| return OsPathPolicy.getFilePathOs().hash(name); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof CaseInsensitiveFilename)) { |
| return false; |
| } |
| return OsPathPolicy.getFilePathOs().equals(this.name, ((CaseInsensitiveFilename) obj).name); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(this).add("name", name).toString(); |
| } |
| } |
| } |