envoy/client/src/main/java/envoy/client/data/ClientConfig.java

package envoy.client.data;

import static java.util.function.Function.identity;

import java.io.File;

import envoy.data.Config;

/**
 * Implements a configuration specific to the Envoy Client with default values
 * and convenience methods.
 * <p>
 * Project: <strong>envoy-client</strong><br>
 * File: <strong>ClientConfig.java</strong><br>
 * Created: <strong>01.03.2020</strong><br>
 *
 * @author Kai S. K. Engelbart
 * @since Envoy Client v0.1-beta
 */
public class ClientConfig extends Config {

	private static ClientConfig config;

	/**
	 * @return the singleton instance of the client config
	 * @since Envoy Client v0.1-beta
	 */
	public static ClientConfig getInstance() {
		if (config == null) config = new ClientConfig();
		return config;
	}

	private ClientConfig() {
		super(".envoy");
		put("server", "s", identity(), true);
		put("port", "p", Integer::parseInt, true);
		put("localDB", "db", File::new, true);
		put("ignoreLocalDB", "nodb", Boolean::parseBoolean);
		put("user", "u", identity());
		put("password", "pw", identity());
	}

	/**
	 * @return the host name of the Envoy server
	 * @since Envoy Client v0.1-alpha
	 */
	public String getServer() { return (String) items.get("server").get(); }

	/**
	 * @return the port at which the Envoy server is located on the host
	 * @since Envoy Client v0.1-alpha
	 */
	public Integer getPort() { return (Integer) items.get("port").get(); }

	/**
	 * @return the local database specific to the client user
	 * @since Envoy Client v0.1-alpha
	 */
	public File getLocalDB() { return (File) items.get("localDB").get(); }

	/**
	 * @return {@code true} if the local database is to be ignored
	 * @since Envoy Client v0.3-alpha
	 */
	public Boolean isIgnoreLocalDB() {
		final var ignoreLocalDB = items.get("ignoreLocalDB").get();
		return ignoreLocalDB != null && (Boolean) ignoreLocalDB;
	}

	/**
	 * @return the user name
	 * @since Envoy Client v0.3-alpha
	 */
	public String getUser() { return (String) items.get("user").get(); }

	/**
	 * @return the password
	 * @since Envoy Client v0.3-alpha
	 */
	public String getPassword() { return (String) items.get("password").get(); }

	/**
	 * @return {@code true} if user name and password are set
	 * @since Envoy Client v0.3-alpha
	 */
	public boolean hasLoginCredentials() { return getUser() != null && getPassword() != null; }
}