1 files changed, 108 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryDirectoryInfo.java b/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryDirectoryInfo.java
new file mode 100644
index 0000000000..400490bbc3
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/vfs/inmemoryfs/InMemoryDirectoryInfo.java
@@ -0,0 +1,108 @@
+// Copyright 2014 Google Inc. 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.MapMaker;
+import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
+import com.google.devtools.build.lib.util.Clock;
+
+import java.util.Set;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * This class represents a directory stored in an {@link InMemoryFileSystem}.
+ */
+@ThreadSafe
+class InMemoryDirectoryInfo extends InMemoryContentInfo {
+
+  private final ConcurrentMap<String, InMemoryContentInfo> directoryContent =
+      new MapMaker().makeMap();
+
+  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(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(name);
+  }
+
+  /**
+   * Removes a previously existing child from the directory specified by this
+   * object.
+   */
+  synchronized void removeChild(String name) {
+    if (directoryContent.remove(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.
+   */
+  Set<String> getAllChildren() {
+    return directoryContent.keySet();
+  }
+
+  @Override
+  public boolean isDirectory() {
+    return true;
+  }
+
+  @Override
+  public boolean isSymbolicLink() {
+    return false;
+  }
+
+  @Override
+  public boolean isFile() {
+    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();
+  }
+
+}