com.g2forge.alexandria.wizard.PropertyStringInput Maven / Gradle / Ivy

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Library for building command line and GUI wizards.

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package com.g2forge.alexandria.wizard;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Properties;

import com.g2forge.alexandria.java.io.RuntimeIOException;

import lombok.AccessLevel;
import lombok.AllArgsConstructor;
import lombok.EqualsAndHashCode;
import lombok.Getter;

@AllArgsConstructor
@EqualsAndHashCode(callSuper = false)
public class PropertyStringInput extends AInput {
	@Getter(value = AccessLevel.PROTECTED, lazy = true)
	private static final Properties properties = computeProperties();

	protected static Properties computeProperties() {
		final String string = System.getProperty(PropertyStringInput.class.getPackage().getName() + ".propertiesfile");
		if (string != null) {
			final Path path = Paths.get(string);
			if (Files.isRegularFile(path)) try (InputStream input = Files.newInputStream(path)) {
				final Properties prop = new Properties();
				prop.load(input);
				return prop;
			} catch (IOException e) {
				throw new RuntimeIOException(e);
			}
		}
		return System.getProperties();
	}

	@Getter
	protected final String property;

	@Getter(lazy = true, value = AccessLevel.PROTECTED)
	private final String value = getProperties().getProperty(getProperty());

	@Override
	public String get() {
		if (isEmpty()) { throw new InputUnspecifiedException(String.format("The property \"%1$s\" was not set!", getProperty())); }
		return getValue();
	}

	@Override
	public boolean isEmpty() {
		return getValue() == null;
	}
}