001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hdfs.web.resources;
019
020import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_REPLICATION_DEFAULT;
021import static org.apache.hadoop.hdfs.client.HdfsClientConfigKeys.DFS_REPLICATION_KEY;
022
023import org.apache.hadoop.conf.Configuration;
024
025/** Replication parameter. */
026public class ReplicationParam extends ShortParam {
027  /** Parameter name. */
028  public static final String NAME = "replication";
029  /** Default parameter value. */
030  public static final String DEFAULT = NULL;
031
032  private static final Domain DOMAIN = new Domain(NAME);
033
034  /**
035   * Constructor.
036   * @param value the parameter value.
037   */
038  public ReplicationParam(final Short value) {
039    super(DOMAIN, value, (short)1, null);
040  }
041
042  /**
043   * Constructor.
044   * @param str a string representation of the parameter value.
045   */
046  public ReplicationParam(final String str) {
047    this(DOMAIN.parse(str));
048  }
049
050  @Override
051  public String getName() {
052    return NAME;
053  }
054
055  /** @return the value or, if it is null, return the default from conf. */
056  public short getValue(final Configuration conf) {
057    return getValue() != null? getValue()
058        : (short)conf.getInt(DFS_REPLICATION_KEY, DFS_REPLICATION_DEFAULT);
059  }
060}