hadoop IntegerParam 源码
haddop IntegerParam 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/web/resources/IntegerParam.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.web.resources;
/** Integer parameter. */
abstract class IntegerParam extends Param<Integer, IntegerParam.Domain> {
IntegerParam(final Domain domain, final Integer value,
final Integer min, final Integer max) {
super(domain, value);
checkRange(min, max);
}
private void checkRange(final Integer min, final Integer max) {
if (value == null) {
return;
}
if (min != null && value < min) {
throw new IllegalArgumentException("Invalid parameter range: " + getName()
+ " = " + domain.toString(value) + " < " + domain.toString(min));
}
if (max != null && value > max) {
throw new IllegalArgumentException("Invalid parameter range: " + getName()
+ " = " + domain.toString(value) + " > " + domain.toString(max));
}
}
@Override
public String toString() {
return getName() + "=" + domain.toString(getValue());
}
/** @return the parameter value as a string */
@Override
public String getValueString() {
return domain.toString(getValue());
}
/** The domain of the parameter. */
static final class Domain extends Param.Domain<Integer> {
/** The radix of the number. */
final int radix;
Domain(final String paramName) {
this(paramName, 10);
}
Domain(final String paramName, final int radix) {
super(paramName);
this.radix = radix;
}
@Override
public String getDomain() {
return "<" + NULL + " | int in radix " + radix + ">";
}
@Override
Integer parse(final String str) {
try{
return NULL.equals(str) || str == null ? null : Integer.parseInt(str,
radix);
} catch(NumberFormatException e) {
throw new IllegalArgumentException("Failed to parse \"" + str
+ "\" as a radix-" + radix + " integer.", e);
}
}
/** Convert an Integer to a String. */
String toString(final Integer n) {
return n == null? NULL: Integer.toString(n, radix);
}
}
}
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