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 org.apache.hadoop.conf.Configuration; 021import org.apache.hadoop.fs.CommonConfigurationKeysPublic; 022 023/** Buffer size parameter. */ 024public class BufferSizeParam extends IntegerParam { 025 /** Parameter name. */ 026 public static final String NAME = "buffersize"; 027 /** Default parameter value. */ 028 public static final String DEFAULT = NULL; 029 030 private static final Domain DOMAIN = new Domain(NAME); 031 032 /** 033 * Constructor. 034 * @param value the parameter value. 035 */ 036 public BufferSizeParam(final Integer value) { 037 super(DOMAIN, value, 1, null); 038 } 039 040 /** 041 * Constructor. 042 * @param str a string representation of the parameter value. 043 */ 044 public BufferSizeParam(final String str) { 045 this(DOMAIN.parse(str)); 046 } 047 048 @Override 049 public String getName() { 050 return NAME; 051 } 052 053 /** @return the value or, if it is null, return the default from conf. */ 054 public int getValue(final Configuration conf) { 055 return getValue() != null? getValue() 056 : conf.getInt( 057 CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY, 058 CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_DEFAULT); 059 } 060}