hadoop Param 源码
haddop Param 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/wsrs/Param.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.lib.wsrs;
import org.apache.hadoop.classification.InterfaceAudience;
import java.text.MessageFormat;
@InterfaceAudience.Private
public abstract class Param<T> {
private String name;
protected T value;
public Param(String name, T defaultValue) {
this.name = name;
this.value = defaultValue;
}
public String getName() {
return name;
}
public T parseParam(String str) {
try {
value = (str != null && str.trim().length() > 0) ? parse(str) : value;
} catch (Exception ex) {
throw new IllegalArgumentException(
MessageFormat.format("Parameter [{0}], invalid value [{1}], value must be [{2}]",
name, str, getDomain()));
}
return value;
}
public T value() {
return value;
}
protected abstract String getDomain();
protected abstract T parse(String str) throws Exception;
@Override
public String toString() {
return (value != null) ? value.toString() : "NULL";
}
}
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