Configuration.java

/*
 * Copyright (c) 2010-2012 Célio Cidral Junior.
 *
 *     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 org.tomighty.config;

import com.google.inject.Injector;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.File;
import java.util.Properties;

public class Configuration {
	
    @Inject private Directories directories;
	@Inject private PropertyStore propertyStore;
	@Inject private Injector injector;
	private Properties properties;
	private File configFile;
	
	@PostConstruct
	public void initialize() {
		configFile = new File(directories.configuration(), "tomighty.conf");
		properties = propertyStore.load(configFile);
	}

	public int asInt(String name, int defaultValue) {
		String value = properties.getProperty(name);
		return value == null ? defaultValue : Integer.parseInt(value);
	}
	
	public boolean asBoolean(String name, boolean defaultValue) {
		String value = properties.getProperty(name);
		return value == null ? defaultValue : Boolean.parseBoolean(value);
	}
	
	public <T> T asObject(String name, Class<T> defaultClass) {
		Class<T> clazz = asClass(name, defaultClass);
		return injector.getInstance(clazz);
	}

	@SuppressWarnings("unchecked")
	public <T> Class<T> asClass(String name, Class<T> defaultClass) {
		String className = properties.getProperty(name);
		if(className == null) {
			return defaultClass;
		}
		try {
			return (Class<T>) Class.forName(className);
		} catch (ClassNotFoundException cause) {
			throw new IllegalArgumentException("Class not found: "+className, cause);
		}
	}
	
	public File asFile(String name) {
		String path = properties.getProperty(name);
		return path != null ? new File(path) : null;
	}

	public void set(String name, boolean value) {
		set(name, String.valueOf(value));
	}

	public void set(String name, int value) {
		set(name, String.valueOf(value));
	}

	public void set(String name, Class<?> value) {
		set(name, value != null ? value.getName() : null);
	}
	
	public void set(String fileKey, File file) {
		set(fileKey, file != null ? file.getAbsolutePath() : null);
	}

	private void set(String name, String value) {
		if(value == null) {
			properties.remove(name);
		} else {
			properties.setProperty(name, value);
		}
		saveConfiguration();
	}

	private void saveConfiguration() {
		propertyStore.store(properties, configFile);
	}
	
}