Load browser configuration from properties file, environment variable, command line

BrowserConfig.java

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class BrowserConfig
{
	public String getBrowserPath()
	{
		String browserPath = "/Applications/Firefox.app/Contents/MacOS/firefox";  // default

		String fromPropertiesFile = loadPropertiesFile("browser.properties").getProperty("browserPath");
		String fromEnvironmentVariable = System.getenv("browserPath");
		String fromSystemProperty = System.getProperty("browserPath");

		if (fromPropertiesFile != null) { browserPath = fromPropertiesFile; }
		if (fromEnvironmentVariable != null) { browserPath = fromEnvironmentVariable; }
		if (fromSystemProperty != null) { browserPath = fromSystemProperty; }

		return browserPath;
	}

	public Properties loadPropertiesFile(String filename)
	{
		ClassLoader loader = Thread.currentThread().getContextClassLoader();
		Properties properties = new Properties();

		try
		{
			InputStream resourceStream = loader.getResourceAsStream(filename);
			properties.load(resourceStream);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}

		return properties;
	}
}