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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.master.cleaner;
19  
20  import org.apache.hadoop.fs.FileStatus;
21  import org.apache.hadoop.hbase.BaseConfigurable;
22  
23  import com.google.common.base.Predicate;
24  import com.google.common.collect.Iterables;
25  
26  /**
27   * Base class for file cleaners which allows subclasses to implement a simple
28   * isFileDeletable method (which used to be the FileCleanerDelegate contract).
29   */
30  public abstract class BaseFileCleanerDelegate extends BaseConfigurable
31  implements FileCleanerDelegate {
32  
33    @Override
34    public Iterable<FileStatus> getDeletableFiles(Iterable<FileStatus> files) {
35      return Iterables.filter(files, new Predicate<FileStatus>() {
36        @Override
37        public boolean apply(FileStatus file) {
38          return isFileDeletable(file);
39        }});
40    }
41  
42    /**
43     * Should the master delete the file or keep it?
44     * @param fStat file status of the file to check
45     * @return <tt>true</tt> if the file is deletable, <tt>false</tt> if not
46     */
47    protected abstract boolean isFileDeletable(FileStatus fStat);
48  
49  }