MoneyDeserializer.java

package com.coinbase.api.deserializer;

import java.io.IOException;
import java.math.BigDecimal;

import org.joda.money.CurrencyUnit;
import org.joda.money.Money;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

public class MoneyDeserializer extends StdDeserializer<Money> {

    public MoneyDeserializer() {
	super(Money.class);
    }

    @Override
    public Money deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
	    throws IOException {

	Money result = null;

	ObjectCodec oc = jsonParser.getCodec();
	JsonNode node = oc.readTree(jsonParser);

	String currency = null;
	String amount = null;
	Long cents = null;

	if (node.has("currency")) {
	    currency = node.get("currency").textValue();
	} else if (node.has("currency_iso")) {
	    currency = node.get("currency_iso").textValue();
	}

	if (node.has("amount")) {
	    amount = node.get("amount").textValue();
	} else if (node.has("cents")) {
	    cents = node.get("cents").longValue();
	}

	if (currency == null || (amount == null && cents == null)) {
	    throw new JsonParseException("Wrong format for Money", jsonParser.getCurrentLocation());
	}

	try {
	    if (amount != null) {
		result = Money.of(CurrencyUnit.of(currency), new BigDecimal(amount));
	    } else {
		result = Money.ofMinor(CurrencyUnit.of(currency), cents);
	    }
	} catch (Exception ex) {
	    throw new JsonParseException("Could not construct Money from arguments",
		    jsonParser.getCurrentLocation(), ex);
	}

	return result;

    }
}