hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestFileContextXAttr.java

/**
 * 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 java.io.IOException;
import java.net.URI;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.XAttrSetFlag;
import org.apache.hadoop.hdfs.DFSConfigKeys;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.junit.BeforeClass;

/**
 * Tests of XAttr operations using FileContext APIs.
 */
public class TestFileContextXAttr extends FSXAttrBaseTest  {

  @Override
  protected FileSystem createFileSystem() throws Exception {
    FileContextFS fcFs = new FileContextFS();
    fcFs.initialize(FileSystem.getDefaultUri(conf), conf);
    return fcFs;
  }

  /**
   * This reuses FSXAttrBaseTest's testcases by creating a filesystem
   * implementation which uses FileContext by only overriding the xattr related
   * methods. Other operations will use the normal filesystem.
   */
  public static class FileContextFS extends DistributedFileSystem {

    private FileContext fc;

    @Override
    public void initialize(URI uri, Configuration conf) throws IOException {
      super.initialize(uri, conf);
      fc = FileContext.getFileContext(conf);
    }
    
    @Override
    public void setXAttr(Path path, final String name, final byte[] value)
      throws IOException {
      fc.setXAttr(path, name, value);
    }
    
    @Override
    public void setXAttr(Path path, final String name, final byte[] value, 
        final EnumSet<XAttrSetFlag> flag) throws IOException {
      fc.setXAttr(path, name, value, flag);
    }
    
    @Override
    public byte[] getXAttr(Path path, final String name) throws IOException {
      return fc.getXAttr(path, name);
    }
    
    @Override
    public Map<String, byte[]> getXAttrs(Path path) throws IOException {
      return fc.getXAttrs(path);
    }
    
    @Override
    public Map<String, byte[]> getXAttrs(Path path, final List<String> names) 
        throws IOException {
      return fc.getXAttrs(path, names);
    }
    
    @Override
    public void removeXAttr(Path path, final String name) throws IOException {
      fc.removeXAttr(path, name);
    }
  }
}