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