OrderLine.java

package uk.co.initech.sandbox;

import javax.persistence.Embeddable;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import javax.persistence.MapsId;

@Entity
public class OrderLine {
	
	@Embeddable
	public static class Key {
		
		private String orderId;
		private String productId;
		
		public Key(String orderId, String productId) {
			this.orderId = orderId;
			this.productId = productId;
		}
		
		@Override
		public int hashCode() {
			return orderId.hashCode() + (productId.hashCode() << 1);
		}
		
		@Override
		public boolean equals(Object that) {
			return (this == that) || ((that instanceof Key) && this.orderId.equals(((Key) that).orderId) && this.productId.equals(((Key) that).productId));
		}
		
	}
	
	@EmbeddedId
	private Key id;
	
	@ManyToOne
	@MapsId("orderId")
	private Order order;
	
	private int quantity;
	
	public OrderLine(Order order, String productId, int quantity) {
		this.id = new Key(order.getId(), productId);
		this.order = order;
		this.quantity = quantity;
	}
	
	protected OrderLine() {}
	
	public Key getId() {
		return id;
	}
	
	public Order getOrder() {
		return order;
	}
	
	public String getProductId() {
		return id.productId;
	}
	
	public int getQuantity() {
		return quantity;
	}
	
	public void setQuantity(int quantity) {
		this.quantity = quantity;
	}
	
	@Override
	public int hashCode() {
		return getId().hashCode();
	}
	
	@Override
	public boolean equals(Object that) {
		return (this == that) || ((that instanceof OrderLine) && this.getId().equals(((OrderLine) that).getId()));
	}
	
}