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Smooks relies on a "Stream Reader" for generating a stream of SAX events from the Source message data stream. A Stream Reader is a class that implements the XMLReader interface (or the SmooksXMLReader interface).

By default, Smooks uses the default XMLReader (XMLReaderFactory.createXMLReader()), but can be easily configured to read non-XML data Sources by configuring a specialized XMLReader:

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd">

    <reader class="com.acme.ZZZZReader" />

    <!-- 
         Other Smooks resources, e.g. <jb:bindings> configs for 
         binding data from the ZZZZ data stream into Java Objects....
    -->

</smooks-resource-list>

The reader can also be configured with a set of handlers, features and parameters. Here is a full example configuration.

<reader class="com.acme.ZZZZReader">
    <handlers>
        <handler class="com.X" />
        <handler class="com.Y" />
    </handlers>
    <features>
        <setOn feature="http://a" />
        <setOn feature="http://b" />
        <setOff feature="http://c" />
        <setOff feature="http://d" />
    </features>
    <params>
        <param name="param1">val1</param>
        <param name="param2">val2</param>
    </params>
</reader>

A number of non-XML Readers are available with Smooks out of the box:

  1. CSVReader
  2. SmooksEDIReader
  3. JSONReader
  4. XStreamXMLReader


Any of the above XMLReaders can be configured as outlined above, but some of them have a specialized configuration namespaces that simplify configuration.

Example - CSVReader Configuration

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:csv="http://www.milyn.org/xsd/smooks/csv-1.1.xsd">

    <!--
    Configure the CSV  to parse the message into a stream of SAX events.
    -->
    <csv:reader fields="firstname,lastname,gender,age,country" separator="|" quote="'" skipLines="1" />

</smooks-resource-list>

Example - SmooksEDIReader Configuration

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:edi="http://www.milyn.org/xsd/smooks/edi-1.1.xsd">

    <edi:reader mappingModel="/org/milyn/smooks/edi/edi-to-xml-mapping.xml" />

</smooks-resource-list>

Example - JSONReader Configurations

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:json="http://www.milyn.org/xsd/smooks/json-1.1.xsd">

    <!--
    Basic configuration...
    -->
    <json:reader/>

</smooks-resource-list>

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:json="http://www.milyn.org/xsd/smooks/json-1.1.xsd">

    <!--
    Key replacement...
    -->
    <json:reader>
        <json:keyMap>
            <json:key from="some key">someKey</json:key>
            <json:key from="some&amp;key" to="someAndKey" />
        </json:keyMap>
    </json:reader>

</smooks-resource-list>

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:json="http://www.milyn.org/xsd/smooks/json-1.1.xsd">

    <!--
    Other configurations...
    -->
    <json:reader keyWhitspaceReplacement="_" keyPrefixOnNumeric="n" illegalElementNameCharReplacement="." nullValueReplacement="##NULL##" />

</smooks-resource-list>

To set features on the default reader, simply omit the class name from the configuration:

<reader>
    <features>
        <setOn feature="http://a" />
        <setOn feature="http://b" />
        <setOff feature="http://c" />
        <setOff feature="http://d" />
    </features>
</reader>
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