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package org.apidesign.apifest08.currency;
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import java.io.Serializable;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.Currency;
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/**
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* Default {@link Convertor} implementation. Exchange rate is stored as equivalents. It means if we have USD to CZK convertor and USD1 = CZK17
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* we store 1 in sourceEquivalent and 17 in destinationEquivalent. This class is immutable.
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* @author lukas
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*
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*/
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class DefaultConvertor implements Convertor, Serializable {
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private static final long serialVersionUID = -1754789142402148099L;
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/**
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* Equivalent in source currency.
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*/
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private final BigDecimal sourceEquivalent;
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/**
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* Equivalent in destination currency.
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*/
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private final BigDecimal destinationEquivalent;
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private final Currency sourceCurrency;
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private final Currency destinationCurrency;
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public DefaultConvertor(BigDecimal sourceEquivalent, BigDecimal destinationEquivalent, Currency sourceCurrency, Currency destinationCurrency) {
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super();
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this.sourceEquivalent = sourceEquivalent;
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this.destinationEquivalent = destinationEquivalent;
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this.sourceCurrency = sourceCurrency;
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this.destinationCurrency = destinationCurrency;
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}
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public Money convert(Money money) {
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if (money==null)
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{
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throw new NullPointerException("Money is null");
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}
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if (!money.getCurrency().equals(getSourceCurrency()))
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{
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throw new IllegalArgumentException("Can not convert from "+money.getCurrency()+". Converts "+getSourceCurrency()+" to "+getDestinationCurrency());
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}
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BigDecimal sourceAmount = money.getAmount();
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BigDecimal destinationAmount = sourceAmount.multiply(destinationEquivalent).divide(sourceEquivalent, 2, RoundingMode.HALF_DOWN);
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return new MoneyImpl(destinationAmount, getDestinationCurrency());
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}
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public Convertor revert() {
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return new DefaultConvertor(destinationEquivalent, sourceEquivalent, destinationCurrency, sourceCurrency);
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}
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public BigDecimal getSourceEquivalent() {
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return sourceEquivalent;
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}
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public BigDecimal getDestinationEquivalent() {
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return destinationEquivalent;
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}
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public Currency getSourceCurrency() {
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return sourceCurrency;
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}
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public Currency getDestinationCurrency() {
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return destinationCurrency;
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}
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@Override
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public String toString() {
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return getClass().getName()+" converts "+getSourceCurrency()+" to "+getDestinationCurrency()+" "
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+getSourceCurrency()+getSourceEquivalent()+"="+getDestinationCurrency()+getDestinationEquivalent();
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}
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@Override
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public int hashCode() {
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final int prime = 31;
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int result = 1;
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result = prime
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* result
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+ ((destinationCurrency == null) ? 0 : destinationCurrency
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.hashCode());
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result = prime
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* result
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+ ((destinationEquivalent == null) ? 0 : destinationEquivalent
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.hashCode());
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result = prime * result
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+ ((sourceCurrency == null) ? 0 : sourceCurrency.hashCode());
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result = prime
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* result
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+ ((sourceEquivalent == null) ? 0 : sourceEquivalent.hashCode());
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return result;
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj)
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return true;
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if (obj == null)
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return false;
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if (!(obj instanceof DefaultConvertor))
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return false;
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DefaultConvertor other = (DefaultConvertor) obj;
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if (destinationCurrency == null) {
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if (other.destinationCurrency != null)
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return false;
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} else if (!destinationCurrency.equals(other.destinationCurrency))
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return false;
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if (destinationEquivalent == null) {
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if (other.destinationEquivalent != null)
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return false;
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} else if (!destinationEquivalent.equals(other.destinationEquivalent))
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return false;
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if (sourceCurrency == null) {
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if (other.sourceCurrency != null)
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return false;
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} else if (!sourceCurrency.equals(other.sourceCurrency))
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return false;
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if (sourceEquivalent == null) {
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if (other.sourceEquivalent != null)
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return false;
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} else if (!sourceEquivalent.equals(other.sourceEquivalent))
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return false;
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return true;
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}
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}
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