Price.java

package com.trywildcard.pair.model.product;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.trywildcard.pair.exception.CardBuilderException;
import com.trywildcard.pair.validation.ValidationTool;

import java.util.Currency;

/**
 * Keep currency information with the numerical value of a price.
 */
public final class Price {
    @JsonIgnore
    private ValidationTool v = new ValidationTool();

    private Float price;
    private Currency currency;


    /**
     * @param price the numerical value of the price.
     * @param currency the currency for this price.
     */
    public Price(Float price, Currency currency) throws CardBuilderException {
        setPrice(price);
        setCurrency(currency);
    }

    /**
     * @return price the numerical value of the price.
     */
    public Float getPrice(){
        return price;
    }

    /**
     * @return currency the currency for this price.
     */
    public Currency getCurrency(){
        return currency;
    }
    

    /*
     * The following private constructor and private methods are required by Jackson. 
     */

    /**
     * Private constructor to allow Jackson deserialization
     */
    private Price(){}

    /**
     * Setter to allow Jackson deserialization.
     * @param price the numerical value of the price.
     */
    private void setPrice(Float price) throws CardBuilderException {
        v.required(v.notNull(price), "Price must not be null");
        v.required(v.notNegative(price), "Price must be a positive Float.");

        this.price = price;
    }

    /**
     * Setter to allow jackson deserialization.
     * @param currency the currency for this price.
     */
    private void setCurrency(Currency currency) throws CardBuilderException {
        v.required(v.notNull(currency), "currency must not be null");
        this.currency = currency;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Price price1 = (Price) o;

        if (currency != null ? !currency.equals(price1.currency) : price1.currency != null) return false;
        if (price != null ? !price.equals(price1.price) : price1.price != null) return false;
        if (v != null ? !v.equals(price1.v) : price1.v != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = v != null ? v.hashCode() : 0;
        result = 31 * result + (price != null ? price.hashCode() : 0);
        result = 31 * result + (currency != null ? currency.hashCode() : 0);
        return result;
    }
}