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JFinal is a simple, light, rapid,independent, extensible Java WEB + ORM framework. The feature of JFinal looks like ruby on rails especially ActiveRecord.
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/**
 * Copyright (c) 2011-2019, James Zhan 詹波 ([email protected]).
 *
 * 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.
 */

package com.jfinal.kit;

import java.io.File;
import java.util.concurrent.ConcurrentHashMap;
import com.jfinal.core.Const;

/**
 * PropKit. PropKit can load properties file from CLASSPATH or File object.
 */
public class PropKit {
	
	private static Prop prop = null;
	private static final ConcurrentHashMap map = new ConcurrentHashMap();
	
	private PropKit() {}
	
	/**
	 * Using the properties file. It will loading the properties file if not loading.
	 * @see #use(String, String)
	 */
	public static Prop use(String fileName) {
		return use(fileName, Const.DEFAULT_ENCODING);
	}
	
	/**
	 * Using the properties file. It will loading the properties file if not loading.
	 * 
	 * Example:

	 * PropKit.use("config.txt", "UTF-8");

	 * PropKit.use("other_config.txt", "UTF-8");


	 * String userName = PropKit.get("userName");

	 * String password = PropKit.get("password");


	 * 
	 * userName = PropKit.use("other_config.txt").get("userName");

	 * password = PropKit.use("other_config.txt").get("password");


	 * 
	 * PropKit.use("com/jfinal/config_in_sub_directory_of_classpath.txt");
	 * 
	 * @param fileName the properties file's name in classpath or the sub directory of classpath
	 * @param encoding the encoding
	 */
	public static Prop use(String fileName, String encoding) {
		Prop result = map.get(fileName);
		if (result == null) {
			synchronized (PropKit.class) {
				result = map.get(fileName);
				if (result == null) {
					result = new Prop(fileName, encoding);
					map.put(fileName, result);
					if (PropKit.prop == null) {
						PropKit.prop = result;
					}
				}
			}
		}
		return result;
	}
	
	/**
	 * Using the properties file bye File object. It will loading the properties file if not loading.
	 * @see #use(File, String)
	 */
	public static Prop use(File file) {
		return use(file, Const.DEFAULT_ENCODING);
	}
	
	/**
	 * Using the properties file bye File object. It will loading the properties file if not loading.
	 * 
	 * Example:

	 * PropKit.use(new File("/var/config/my_config.txt"), "UTF-8");

	 * Strig userName = PropKit.use("my_config.txt").get("userName");
	 * 
	 * @param file the properties File object
	 * @param encoding the encoding
	 */
	public static Prop use(File file, String encoding) {
		Prop result = map.get(file.getName());
		if (result == null) {
			synchronized (PropKit.class) {
				result = map.get(file.getName());
				if (result == null) {
					result = new Prop(file, encoding);
					map.put(file.getName(), result);
					if (PropKit.prop == null) {
						PropKit.prop = result;
					}
				}
			}
		}
		return result;
	}
	
	public static Prop useless(String fileName) {
		Prop previous = map.remove(fileName);
		if (PropKit.prop == previous) {
			PropKit.prop = null;
		}
		return previous;
	}
	
	public static void clear() {
		prop = null;
		map.clear();
	}
	
	public static Prop append(Prop prop) {
		synchronized (PropKit.class) {
			if (PropKit.prop != null) {
				PropKit.prop.append(prop);
			} else {
				PropKit.prop = prop;
			}
			return PropKit.prop;
		}
	}
	
	public static Prop append(String fileName, String encoding) {
		return append(new Prop(fileName, encoding));
	}
	
	public static Prop append(String fileName) {
		return append(fileName, Const.DEFAULT_ENCODING);
	}
	
	public static Prop appendIfExists(String fileName, String encoding) {
		try {
			return append(new Prop(fileName, encoding));
		} catch (Exception e) {
			return PropKit.prop;
		}
	}
	
	public static Prop appendIfExists(String fileName) {
		return appendIfExists(fileName, Const.DEFAULT_ENCODING);
	}
	
	public static Prop append(File file, String encoding) {
		return append(new Prop(file, encoding));
	}
	
	public static Prop append(File file) {
		return append(file, Const.DEFAULT_ENCODING);
	}
	
	public static Prop appendIfExists(File file, String encoding) {
		if (file.exists()) {
			append(new Prop(file, encoding));
		}
		return PropKit.prop;
	}
	
	public static Prop appendIfExists(File file) {
		return appendIfExists(file, Const.DEFAULT_ENCODING);
	}
	
	public static Prop getProp() {
		if (prop == null) {
			throw new IllegalStateException("Load propties file by invoking PropKit.use(String fileName) method first.");
		}
		return prop;
	}
	
	public static Prop getProp(String fileName) {
		return map.get(fileName);
	}
	
	public static String get(String key) {
		return getProp().get(key);
	}
	
	public static String get(String key, String defaultValue) {
		return getProp().get(key, defaultValue);
	}
	
	public static Integer getInt(String key) {
		return getProp().getInt(key);
	}
	
	public static Integer getInt(String key, Integer defaultValue) {
		return getProp().getInt(key, defaultValue);
	}
	
	public static Long getLong(String key) {
		return getProp().getLong(key);
	}
	
	public static Long getLong(String key, Long defaultValue) {
		return getProp().getLong(key, defaultValue);
	}
	
	public static Boolean getBoolean(String key) {
		return getProp().getBoolean(key);
	}
	
	public static Boolean getBoolean(String key, Boolean defaultValue) {
		return getProp().getBoolean(key, defaultValue);
	}
	
	public static boolean containsKey(String key) {
		return getProp().containsKey(key);
	}
}