com.zavakid.mushroom.impl.ConfigBuilder.java Source code

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Here is the source code for com.zavakid.mushroom.impl.ConfigBuilder.java

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/**
   Copyright [2013] [Mushroom]
    
   Licensed 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.
 */
/**
 Notice : this source is extracted from Hadoop metric2 package
 and some source code may changed by zavakid
 */
package com.zavakid.mushroom.impl;

import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.SubsetConfiguration;

/**
 * Helper class for building configs, mostly used in tests
 * 
 * @author Hadoop metric2 package's authors
 * @since 0.1
 */
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, ".");
    }

}