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Apache Hadoop HDFS
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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hdfs.server.namenode;

import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.util.EnumCounters;

/**
 * The counter to be computed for content types such as file, directory and symlink,
 * and the storage type usage such as SSD, DISK, ARCHIVE.
 */
public class ContentCounts {
  private EnumCounters contents;
  private EnumCounters types;

  public static class Builder {
    private EnumCounters contents;
    // storage spaces used by corresponding storage types
    private EnumCounters types;

    public Builder() {
      contents = new EnumCounters(Content.class);
      types = new EnumCounters(StorageType.class);
    }

    public Builder file(long file) {
      contents.set(Content.FILE, file);
      return this;
    }

    public Builder directory(long directory) {
      contents.set(Content.DIRECTORY, directory);
      return this;
    }

    public Builder symlink(long symlink) {
      contents.set(Content.SYMLINK, symlink);
      return this;
    }

    public Builder length(long length) {
      contents.set(Content.LENGTH, length);
      return this;
    }

    public Builder storagespace(long storagespace) {
      contents.set(Content.DISKSPACE, storagespace);
      return this;
    }

    public Builder snapshot(long snapshot) {
      contents.set(Content.SNAPSHOT, snapshot);
      return this;
    }

    public Builder snapshotable_directory(long snapshotable_directory) {
      contents.set(Content.SNAPSHOTTABLE_DIRECTORY, snapshotable_directory);
      return this;
    }

    public ContentCounts build() {
      return new ContentCounts(contents, types);
    }
  }

  private ContentCounts(EnumCounters contents,
      EnumCounters types) {
    this.contents = contents;
    this.types = types;
  }

  // Get the number of files.
  public long getFileCount() {
    return contents.get(Content.FILE);
  }

  // Get the number of directories.
  public long getDirectoryCount() {
    return contents.get(Content.DIRECTORY);
  }

  // Get the number of symlinks.
  public long getSymlinkCount() {
    return contents.get(Content.SYMLINK);
  }

  // Get the total of file length in bytes.
  public long getLength() {
    return contents.get(Content.LENGTH);
  }

  // Get the total of storage space usage in bytes including replication.
  public long getStoragespace() {
    return contents.get(Content.DISKSPACE);
  }

  // Get the number of snapshots
  public long getSnapshotCount() {
    return contents.get(Content.SNAPSHOT);
  }

  // Get the number of snapshottable directories.
  public long getSnapshotableDirectoryCount() {
    return contents.get(Content.SNAPSHOTTABLE_DIRECTORY);
  }

  public long[] getTypeSpaces() {
    return types.asArray();
  }

  public long getTypeSpace(StorageType t) {
    return types.get(t);
  }

  public void addContent(Content c, long val) {
    contents.add(c, val);
  }

  public void addContents(ContentCounts that) {
    contents.add(that.contents);
    types.add(that.types);
  }

  public void addTypeSpace(StorageType t, long val) {
    types.add(t, val);
  }

  public void addTypeSpaces(EnumCounters that) {
    this.types.add(that);
  }
}