| // 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.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.concurrent.ThreadSafety.ThreadSafe; |
| import com.google.devtools.build.lib.vfs.OsPathPolicy; |
| import java.util.Collection; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * This class represents a directory stored in an {@link InMemoryFileSystem}. |
| */ |
| @ThreadSafe |
| class InMemoryDirectoryInfo extends InMemoryContentInfo { |
| private final ConcurrentMap<InMemoryFileName, InMemoryContentInfo> directoryContent = |
| new ConcurrentHashMap<>(); |
| |
| InMemoryDirectoryInfo(Clock clock) { |
| this(clock, true); |
| } |
| |
| protected InMemoryDirectoryInfo(Clock clock, boolean isMutable) { |
| super(clock, isMutable); |
| if (isMutable) { |
| setExecutable(true); |
| } |
| } |
| |
| /** |
| * Adds a new child to this directory under the name "name". Callers must |
| * ensure that no entry of that name exists already. |
| */ |
| synchronized void addChild(String name, InMemoryContentInfo inode) { |
| Preconditions.checkNotNull(name); |
| Preconditions.checkNotNull(inode); |
| if (directoryContent.put(new InMemoryFileName(name), inode) != null) { |
| throw new IllegalArgumentException("File already exists: " + name); |
| } |
| markModificationTime(); |
| } |
| |
| /** |
| * Does a directory lookup, and returns the "inode" for the specified name. |
| * Returns null if the child is not found. |
| */ |
| synchronized InMemoryContentInfo getChild(String name) { |
| return directoryContent.get(new InMemoryFileName(name)); |
| } |
| |
| /** |
| * Removes a previously existing child from the directory specified by this |
| * object. |
| */ |
| synchronized void removeChild(String name) { |
| if (directoryContent.remove(new InMemoryFileName(name)) == null) { |
| throw new IllegalArgumentException(name + " is not a member of this directory"); |
| } |
| markModificationTime(); |
| } |
| |
| /** |
| * This function returns the content of a directory. For now, it returns a set to reflect the |
| * semantics of the value returned (ie. unordered, no duplicates). If thats too slow, it should be |
| * changed later. |
| */ |
| Collection<String> getAllChildren() { |
| return Collections2.transform( |
| directoryContent.keySet(), inMemoryFileName -> inMemoryFileName.value); |
| } |
| |
| @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(); |
| } |
| |
| @ThreadSafety.Immutable |
| private static final class InMemoryFileName { |
| private final String value; |
| |
| private InMemoryFileName(String value) { |
| this.value = value; |
| } |
| |
| @Override |
| public int hashCode() { |
| return OsPathPolicy.getFilePathOs().hash(value); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == this) { |
| return true; |
| } |
| if (!(obj instanceof InMemoryFileName)) { |
| return false; |
| } |
| return OsPathPolicy.getFilePathOs().equals(this.value, ((InMemoryFileName) obj).value); |
| } |
| } |
| } |