org.cinchapi.concourse.config.ConcourseConfiguration Maven / Gradle / Ivy

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This is the api to interact with Concourse, a schemaless and distributed version control database with optimistic availability, serializable transactions and full-text search. Concourse provides a more intuitive approach to data management that is easy to deploy, access and scale with minimal tuning while also maintaining the referential integrity and ACID characteristics of traditional database systems.

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/*
 * The MIT License (MIT)
 * 
 * Copyright (c) 2013 Jeff Nelson, Cinchapi Software Collective
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.cinchapi.concourse.config;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.ConfigurationUtils;
import org.apache.commons.configuration.DefaultFileSystem;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.Level;

import com.google.common.base.Throwables;

/**
 * A {@link PropertiesConfiguration} loader with additional methods.
 * 
 * @author jnelson
 */
public class ConcourseConfiguration extends PropertiesConfiguration {

	/*
	 * This implementation uses lower case strings when putting and getting from
	 * the map in order to facilitate case insensitivity. DO NOT use any other
	 * methods beyond #get and #put because those have not been overridden to
	 * account for the case insensitivity.
	 */
	private static Map multipliers = new HashMap() {

		private static final long serialVersionUID = 1L;

		@Override
		public Integer get(Object key) {
			if(key instanceof String) {
				key = ((String) key).toLowerCase();
			}
			return super.get(key);
		}

		@Override
		public Integer put(String key, Integer value) {
			key = key.toLowerCase();
			return super.put(key, value);
		}

	};
	static {
		multipliers.put("b", (int) Math.pow(1024, 0));
		multipliers.put("k", (int) Math.pow(1024, 1));
		multipliers.put("kb", (int) Math.pow(1024, 1));
		multipliers.put("m", (int) Math.pow(1024, 2));
		multipliers.put("mb", (int) Math.pow(1024, 2));
		multipliers.put("g", (int) Math.pow(1024, 3));
		multipliers.put("gb", (int) Math.pow(1024, 3));

		// Prevent logging from showing up in the console
		((ch.qos.logback.classic.Logger) LoggerFactory
				.getLogger(ConcourseConfiguration.class)).setLevel(Level.OFF);
		((ch.qos.logback.classic.Logger) LoggerFactory
				.getLogger(ConfigurationUtils.class)).setLevel(Level.OFF);
		((ch.qos.logback.classic.Logger) LoggerFactory
				.getLogger(DefaultFileSystem.class)).setLevel(Level.OFF);
	}

	/**
	 * Load the configuration from {@code file}.
	 * 
	 * @param file
	 * @return the configuration
	 */
	public static ConcourseConfiguration loadConfig(String file) {
		try {
			return new ConcourseConfiguration(file);
		}
		catch (ConfigurationException e) {
			throw Throwables.propagate(e);
		}
	}

	/**
	 * Construct a new instance.
	 * 
	 * @param file
	 * @throws ConfigurationException
	 */
	private ConcourseConfiguration(String file) throws ConfigurationException {
		super(file);
	}

	/**
	 * Get the size description associated with the given key. If the key
	 * doesn't map to an existing object, the defaultValue is returned.
	 * 
	 * @param key
	 * @param defaultValue
	 * @return the associated size description if key is found, defaultValue
	 *         otherwise
	 */
	public long getSize(String key, long defaultValue) {
		String value = getString(key, null);
		if(value != null) {
			String[] parts = value.split("(?<=\\D)(?=\\d)|(?<=\\d)(?=\\D)");
			long base = Long.parseLong(parts[0]);
			int multiplier;
			if(parts.length > 1) {
				multiplier = multipliers.get(parts[1]);
			}
			else {
				multiplier = multipliers.get("b");
			}
			return base * multiplier;
		}
		else {
			return defaultValue;
		}
	}

	/**
	 * Get the enum value associated with the given key. If the key doesn't map
	 * to an existing object or the mapped value is not a valid enum, the
	 * defaultValue is returned
	 * 
	 * @param key
	 * @param defaultValue
	 * @return the associated enum if key is found, defaultValue
	 *         otherwise
	 */
	@SuppressWarnings("unchecked")
	public > T getEnum(String key, T defaultValue) {
		String value = getString(key, null);
		if(value != null) {
			try {
				defaultValue = (T) Enum.valueOf(defaultValue.getClass(), value);
			}
			catch (IllegalArgumentException e) {
				// ignore
			}
		}
		return defaultValue;
	}
}