Album.java

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package com.insightfullogic.java8.examples.chapter1;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;

import static java.util.Collections.unmodifiableList;
import static java.util.stream.Collectors.toList;

/**
 *
 * @author richard
 */
public final class Album implements Performance {
    
    private final String name;
    private final List<Track> tracks;
    private final List<Artist> musicians;

    public Album(String name, List<Track> tracks, List<Artist> musicians) {
        Objects.requireNonNull(name);
        Objects.requireNonNull(tracks);
        Objects.requireNonNull(musicians);

        this.name = name;
        this.tracks = new ArrayList<>(tracks);
        this.musicians = new ArrayList<>(musicians);
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @return the tracks
     */
    public Stream<Track> getTracks() {
        return tracks.stream();
    }

    /**
     * Used in imperative code examples that need to iterate over a list
     */
    public List<Track> getTrackList() {
        return unmodifiableList(tracks);
    }

    /**
     * @return the musicians
     */
    public Stream<Artist> getMusicians() {
        return musicians.stream();
    }

    /**
     * Used in imperative code examples that need to iterate over a list
     */
    public List<Artist> getMusicianList() {
        return unmodifiableList(musicians);
    }

    public Artist getMainMusician() {
        return musicians.get(0);
    }

    public Album copy() {
        List<Track> copiesTracks = getTracks().map(Track::copy).collect(toList());
        List<Artist> copiesMusicians = getMusicians().map(Artist::copy).collect(toList());
        return new Album(name, copiesTracks, copiesMusicians);
    }

}