Album.java

package com.cheng.mvvmstudy.albumrobobinding.model.bean;

/**
 * @since 1.0
 * @author Cheng Wei
 * @author Robert Taylor
 * 
 */
public class Album {
	public static final int NO_ID = -1;

	private long id;
	private String title;
	private String artist;
	private boolean classical;
	private String composer;

	private Album(Builder builder) {
		validate(builder);
		this.id = builder.id;
		this.title = builder.title;
		this.artist = builder.artist;
		this.classical = builder.classical;
		if (builder.isClassical()) {
			this.composer = builder.composer;
		}
	}

	private void validate(Builder builder) {
	}

	public long getId() {
		return id;
	}

	public void setId(long id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public String getArtist() {
		return artist;
	}

	public boolean isClassical() {
		return classical;
	}

	public String getComposer() {
		return composer;
	}

	@Override
	public int hashCode() {
		return System.identityHashCode(id);
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Album other = (Album) obj;
		if (id != other.id)
			return false;
		return true;
	}

	public boolean isNew() {
		return isNew(id);
	}

	public Builder createBuilder() {
		Builder builder = new Builder();
		builder.setTitle(title);
		builder.setArtist(artist);
		builder.setClassical(classical);
		builder.setComposer(composer);
		builder.setId(id);
		return builder;
	}

	public static boolean isNew(long albumId) {
		return albumId == NO_ID;
	}

	public static class Builder {
		private long id = NO_ID;
		private String title;
		private String artist;
		private boolean classical;
		private String composer;

		public long getId() {
			return id;
		}

		public Builder setId(long id) {
			this.id = id;
			return this;
		}

		public String getTitle() {
			return title;
		}

		public Builder setTitle(String title) {
			this.title = title;
			return this;
		}

		public String getArtist() {
			return artist;
		}

		public Builder setArtist(String artist) {
			this.artist = artist;
			return this;
		}

		public boolean isClassical() {
			return classical;
		}

		public Builder setClassical(boolean classical) {
			this.classical = classical;
			return this;
		}

		public String getComposer() {
			return composer;
		}

		public Builder setComposer(String composer) {
			this.composer = composer;
			return this;
		}

		public boolean isNew() {
			return Album.isNew(id);
		}

		public Album create() {
			return new Album(this);
		}
	}

}