/*
* Copyright 2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.oreilly.springdata.jpa.order;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import org.springframework.util.Assert;
import com.oreilly.springdata.jpa.core.AbstractEntity;
import com.oreilly.springdata.jpa.core.Product;
/**
* A line item.
*
* @author Oliver Gierke
*/
@Entity
public class LineItem extends AbstractEntity {
@ManyToOne
private Product product;
@Column(nullable = false)
private BigDecimal price;
private int amount;
/**
* Creates a new {@link LineItem} for the given {@link Product}.
*
* @param product must not be {@literal null}.
*/
public LineItem(Product product) {
this(product, 1);
}
/**
* Creates a new {@link LineItem} for the given {@link Product} and amount.
*
* @param product must not be {@literal null}.
* @param amount
*/
public LineItem(Product product, int amount) {
Assert.notNull(product, "The given Product must not be null!");
Assert.isTrue(amount > 0, "The amount of Products to be bought must be greater than 0!");
this.product = product;
this.amount = amount;
this.price = product.getPrice();
}
public LineItem() {
}
/**
* Returns the {@link Product} the {@link LineItem} refers to.
*
* @return
*/
public Product getProduct() {
return product;
}
/**
* Returns the amount of {@link Product}s to be ordered.
*
* @return
*/
public int getAmount() {
return amount;
}
/**
* Returns the price a single unit of the {@link LineItem}'s product.
*
* @return the price
*/
public BigDecimal getUnitPrice() {
return price;
}
/**
* Returns the total for the {@link LineItem}.
*
* @return
*/
public BigDecimal getTotal() {
return price.multiply(BigDecimal.valueOf(amount));
}
}