Ovn2/Recording.java

import java.util.*;

public class Recording implements Comparable<Recording> {
	private final int year;
	private final String artist;
	private final String title;
	private final String type;
	private final Set<String> genre;

	public Recording(String title, String artist, int year, String type, Set<String> genre) {
		this.title = title;
		this.year = year;
		this.artist = artist;
		this.type = type;
		this.genre = genre;
	}

	public String getArtist() {
		return artist;
	}

	public Collection<String> getGenre() {
		return genre;
	}

	public String getTitle() {
		return title;
	}

	public String getType() {
		return type;
	}

	public int getYear() {
		return year;
	}

	@Override
	public String toString() {
		return String.format("{ %s | %s | %s | %d | %s }", artist, title, genre, year, type);
	}
	
	@Override
	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}
		else if (other instanceof Recording){
			Recording r = (Recording) other;
			
			return title.equals(r.title) && artist.equals(r.getArtist()) && year == r.getYear();
		}
		
		return false;
	}
	
	//public int compareTo(Recording other) {

		//if (artist.compareTo(other.getArtist()) != 0) {
			//return artist.compareTo(other.getArtist());
		//} else if (title.compareTo(other.getTitle()) != 0) {
			//return title.compareTo(other.getTitle());
		//} else {
			//return year - other.getYear();
		//}
	//}
	
	@Override
	public int hashCode() {
		return Objects.hash(title, artist, year);
	}
	
	public static Comparator<Recording> getArtistCmp(){
		return new ArtistCmp();
	}
	
	public static Comparator<Recording> getTitleCmp(){
		return Comparator.comparing(Recording::getTitle);
	}
	
	public static Comparator<Recording> getYearCmp(){
		return Comparator.comparing(Recording::getYear);
	}
	
	private static class ArtistCmp implements Comparator<Recording>{
		public int compare(Recording r1, Recording r2) {
			return r1.getArtist().compareTo(r2.getArtist());
		}
	}
}