package org.apidesign.apifest08.currency;

 import java.io.Serializable;

 import java.math.BigDecimal;

 import java.util.Currency;

 /**

  * Default implementation of {@link Money} interface. This class is immutable.

  * @author lukas

  *

  */

 public final class MoneyImpl implements Serializable, Money{

 	private static final long serialVersionUID = -6091808475616516136L;

 	private final BigDecimal amount;

 	private final Currency currency;

 	public MoneyImpl(BigDecimal amount, Currency currency) {

 		if (amount==null) throw new NullPointerException("Amount is null");

 		if (currency==null) throw new NullPointerException("Currency is null"+currency);

 		this.amount = amount;

 		this.currency = currency;

 	}

 	public MoneyImpl(long amount, Currency currency) {

 		this(BigDecimal.valueOf(amount), currency);

 	}

 	public MoneyImpl(double amount, Currency currency) {

 		this(BigDecimal.valueOf(amount), currency);

 	}

 	/**

 	 * Factory method.

 	 * @param amount

 	 * @param currency

 	 * @return

 	 */

 	public static final Money money(BigDecimal amount, Currency currency)

 	{

 		return new MoneyImpl(amount, currency);

 	}

 	/**

 	 * Factory method.

 	 * @param amount

 	 * @param currency

 	 * @return

 	 */

 	public static final Money money(long amount, Currency currency)

 	{

 		return new MoneyImpl(amount, currency);

 	}

 	/**

 	 * Factory method.

 	 * @param amount

 	 * @param currency

 	 * @return

 	 */

 	public static final Money money(double amount, Currency currency)

 	{

 		return new MoneyImpl(amount, currency);

 	}

 	/**

 	 * Returns amount.

 	 * @return

 	 */

 	public BigDecimal getAmount() {

 		return amount;

 	}

 	/**

 	 * Returns currency.

 	 */

 	public Currency getCurrency() {

 		return currency;

 	}

 	@Override

 	public int hashCode() {

 		final int prime = 31;

 		int result = 1;

 		result = prime * result + ((amount == null) ? 0 : amount.hashCode());

 		result = prime * result

 				+ ((currency == null) ? 0 : currency.hashCode());

 		return result;

 	}

 	@Override

 	public boolean equals(Object obj) {

 		if (this == obj)

 			return true;

 		if (obj == null)

 			return false;

 		if (!(obj instanceof MoneyImpl))

 			return false;

 		MoneyImpl other = (MoneyImpl) obj;

 		if (amount == null) {

 			if (other.amount != null)

 				return false;

 		} else if (amount.compareTo(other.amount)!=0)

 			return false;

 		if (currency == null) {

 			if (other.currency != null)

 				return false;

 		} else if (!currency.equals(other.currency))

 			return false;

 		return true;

 	}

 	@Override

 	public String toString() {

 		return getClass().getName()+"["+currency+amount+"]";

 	}

 }