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// 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.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.util.OS;
import java.util.Collection;
import java.util.Objects;
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) {
if (name == null) { throw new NullPointerException(); }
if (inode == null) { throw new NullPointerException(); }
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 OS.getCurrent() == OS.WINDOWS ? value.toLowerCase().hashCode() : value.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof InMemoryFileName)) {
return false;
}
InMemoryFileName that = (InMemoryFileName) obj;
if (OS.getCurrent() != OS.WINDOWS) {
return Objects.equals(this.value, that.value);
} else {
return Objects.equals(this.value.toLowerCase(), that.value.toLowerCase());
}
}
}
}
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