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package org.apidesign.apifest08.currency;
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import java.io.Serializable;
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import java.util.Arrays;
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import java.util.Currency;
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/**
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* Convertor that is composed from other convertors.
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* @author lukas
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*
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*/
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class CompositeConvertor implements ExtendedConvertor, Serializable {
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private static final long serialVersionUID = -2702026568249130055L;
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private final ExtendedConvertor[] convertors;
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public CompositeConvertor(ExtendedConvertor... convertors) {
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this.convertors = convertors.clone();
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for (ExtendedConvertor convertor: this.convertors)
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{
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if (convertor==null)
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{
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throw new NullPointerException("One of the convertors to be merged is null");
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}
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}
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}
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/**
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* Returns true if the composite contains convertor that supports given conversion.
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*/
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public boolean isConversionSupported(Currency from, Currency to) {
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return findConvertorFor(from, to)!=null;
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}
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/**
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* If the composite contains convertor that supports given conversion, delegates to its convert method.
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* Throws {@link IllegalArgumentException} convertor supporting given conversion is not found.
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*/
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public Money convert(Money amount, Currency destinationCurrency) throws IllegalArgumentException {
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ExtendedConvertor convertor = findConvertorFor(amount.getCurrency(), destinationCurrency);
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if (convertor!=null)
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{
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return convertor.convert(amount, destinationCurrency);
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}
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throw new IllegalArgumentException("Conversion not supported. Can not convert to "+destinationCurrency+".");
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}
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/**
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* Finds convertor for given currencies. If not found, returns null.
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* @param from
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* @param to
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* @return
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*/
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ExtendedConvertor findConvertorFor(Currency from, Currency to) {
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//does linear search, in the future can cache the results.
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for (ExtendedConvertor convertor:convertors)
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{
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if (convertor.isConversionSupported(from, to))
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{
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return convertor;
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}
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}
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return null;
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}
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@Override
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public String toString() {
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return getClass().getName()+" converts "+Arrays.toString(convertors);
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}
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}
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