Groovy Component Reference

<flow name="groovyTransformerWithParameters">
    <script:transformer name="stringReplaceWithParams">
            <script:script engine="groovy">
                <property key="oldStr" value="l" />
                <property key="newStr" value="x" />
                <script:text>
                    return payload.toString().replaceAll("$oldStr", "$newStr")
                 </script:text>
            </script:script>
    </script:transformer>
</flow>

<http:listener-config name="http_conf" host="localhost" port="8081" doc:name="HTTP Response Configuration"/>
<flow name="greedy">
    <http:listener path="/" doc:name="HTTP Connector" config-ref-inbound="http_conf"/>
    <http:body-to-parameter-map-transformer />

    <set-payload value="#[payload['amount']]" />
    <transformer ref="StringToNumber" />
    <transformer ref="DollarsToCents"/>

    <scripting:component doc:name="USD Currency Script">
        <scripting:script file="greedy.groovy">
            <property key="currency" value="USD"/>
        </scripting:script>
    </scripting:component>
</flow>

// Adapted from the Groovy Cookbook
// https://web.archive.org/web/20150213041152/http://groovy.codehaus.org/Greedy+Coin+Changer+in+Groovy

enum USD {
    quarters(25), dimes(10), nickels(5), pennies(1)
    USD(v) { value = v }
    final value
}

enum GBP {
    two_pounds (200), pounds (100), fifty_pence(50), twenty_pence(20), ten_pence(10), five_pence(5), two_pence(2), pennies(1)
    GBP(v) { value = v }
    final value
}

def change(currency, amount) {
  currency.values().inject([]){ list, coin ->
     int count = amount / coin.value
     amount = amount % coin.value
     list += "$count $coin"
  }
}

switch (currency) {
    case "USD": return change(USD, payload).toString()
    case "GBP": return change(GBP, payload).toString()
    default: throw new AssertionError("Unsupported currency: $currency")
}