/**
* 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.metrics2.impl;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.SubsetConfiguration;
/**
* Helper class for building configs, mostly used in tests
*/
public class ConfigBuilder {
/** The built config */
public final PropertiesConfiguration config;
/**
* Default constructor
*/
public ConfigBuilder() {
config = new PropertiesConfiguration();
}
/**
* Add a property to the config
* @param key of the property
* @param value of the property
* @return self
*/
public ConfigBuilder add(String key, Object value) {
config.addProperty(key, value);
return this;
}
/**
* Save the config to a file
* @param filename to save
* @return self
* @throws RuntimeException
*/
public ConfigBuilder save(String filename) {
try {
config.save(filename);
}
catch (Exception e) {
throw new RuntimeException("Error saving config", e);
}
return this;
}
/**
* Return a subset configuration (so getParent() can be used.)
* @param prefix of the subset
* @return the subset config
*/
public SubsetConfiguration subset(String prefix) {
return new SubsetConfiguration(config, prefix, ".");
}
}