java-recipe-manager/src/main/lombok/org/leumasjaffe/recipe/controller/SwingSaveLoadHandle.java

package org.leumasjaffe.recipe.controller;

import java.awt.Component;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Optional;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

import lombok.AccessLevel;
import lombok.RequiredArgsConstructor;
import lombok.SneakyThrows;
import lombok.experimental.FieldDefaults;
import lombok.experimental.NonFinal;

@RequiredArgsConstructor
@FieldDefaults(level=AccessLevel.PRIVATE, makeFinal=true)
class SwingSaveLoadHandle implements SaveLoadHandle {
	JFileChooser chooser = new JFileChooser();
	Component owner;
	@NonFinal File filename = null;
	
	@Override
	@SuppressWarnings("resource")
	@SneakyThrows(IOException.class)
	public Optional<Writer> writer() {
		if (filename != null) {
			return Optional.of(new FileWriter(filename));
		} else if (chooser.showSaveDialog(owner) == JFileChooser.APPROVE_OPTION) {
			filename = chooser.getSelectedFile();
			return Optional.of(new FileWriter(filename));
		} else {
			return Optional.empty();
		}
	}
	
	@Override
	@SuppressWarnings("resource")
	@SneakyThrows(FileNotFoundException.class)
	public Optional<Reader> reader() {
		if (chooser.showOpenDialog(owner) == JFileChooser.APPROVE_OPTION) {
			filename = chooser.getSelectedFile();
			return Optional.of(new FileReader(filename));
		} else {
			return Optional.empty();
		}
	}

	@Override
	public void error(Exception ex) {
		JOptionPane.showMessageDialog(owner, ex.getLocalizedMessage(),
				"File Error", JOptionPane.ERROR_MESSAGE);
	}

	@Override
	public void clear() {
		this.filename = null;
	}

}