How to check if file exists in Mule esb

Question

I want to use choice flow control which will chose one route when file named #[function:dateStamp:dd-MM-yyyy].xml exists and other route when this file does not exist.

Is it possible to write 'when' part of choice to check for file existence?

Answer 1

You could use MEL:

<configuration>
    <expression-language>
        <import class="java.text.SimpleDateFormat" />
        <global-functions><![CDATA[
          def xmlFileExists() {
            filePath = '/tmp/' + new SimpleDateFormat('dd-MM-yyyy').format(new Date()) + '.xml';
            new File(filePath).isFile();
          }
        ]]></global-functions>
    </expression-language>
</configuration>

...

    <choice>
        <when expression="#[xmlFileExists()]">
            ...
        </when>
        <otherwise>
            ...
        </otherwise>
    </choice>