図2.2 ビジター論理の実装

<order id='332'>
    <header>
        <customer number="123">Joe</customer>
    </header>
    <order-items>
        <order-item id='1'>
            <product>1</product>
            <quantity>2</quantity>
            <price>8.80</price>
        </order-item>
 
        <!-- etc etc -->
 
    </order-items>
</order>

<salesorder>
    <details>
        <orderid>332</orderid>
        <customer>
            <id>123</id>
            <name>Joe</name>
        </customer>
    <details>
    <itemList>
        <item>
            <id>1</id>
            <productId>1</productId>
            <quantity>2</quantity>
            <price>8.80</price>
        <item>        
 
        <!-- etc etc -->
 
    </itemList>
</salesorder>

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd"
                      xmlns:ftl="http://www.milyn.org/xsd/smooks/freemarker-1.1.xsd">
 
    <!--
    Filter the message using the SAX Filter (i.e. not DOM, so no
    intermediate DOM for the "complete" message - there are "mini" DOMs
    for the NodeModels below)....
    -->
    <params>
        <param name="stream.filter.type">SAX</param>
        <param name="default.serialization.on">false</param>
    </params>
 
    <!--
    Create 2 NodeModels.  One high level model for the "order"
    (header etc) and then one per "order-item".
 
    These models are used in the FreeMarker templating resources
    defined below.  You need to make sure you set the selector such
    that the total memory footprint is as low as possible.  In this
    example, the "order" model will contain everything accept the
    <order-item> data (the main bulk of data in the message).  The
    "order-item" model only contains the current <order-item> data
    (i.e. there's max 1 order-item in memory at any one time).
    -->
    <resource-config selector="order,order-item">
        <resource>org.milyn.delivery.DomModelCreator</resource>
    </resource-config>
 
    <!--
    Apply the first part of the template when we reach the start
    of the <order-items> element.  Apply the second part when we
    reach the end.
 
    Note the <?TEMPLATE-SPLIT-PI?> Processing Instruction in the
    template.  This tells Smooks where to split the template,
    resulting in the order-items being inserted at this point.
    -->
    <ftl:freemarker applyOnElement="order-items">
        <ftl:template><!--<salesorder>
    <details>
        <orderid>${order.@id}</orderid>
        <customer>
            <id>${order.header.customer.@number}</id>
            <name>${order.header.customer}</name>
        </customer>
    </details>
    <itemList>
        <?TEMPLATE-SPLIT-PI?>
    </itemList>
</salesorder>--></ftl:template>
    </ftl:freemarker>
 
    <!--
    Output the <order-items> elements.  This will appear in the
    output message where the <?TEMPLATE-SPLIT-PI?> token appears in the
    order-items template.
    -->
    <ftl:freemarker applyOnElement="order-item">
        <ftl:template><!--        <item>
            <id>${.vars["order-item"].@id}</id>
            <productId>${.vars["order-item"].product}</productId>
            <quantity>${.vars["order-item"].quantity}</quantity>
            <price>${.vars["order-item"].price}</price>
        </item>
        --></ftl:template>
    </ftl:freemarker>
 
</smooks-resource-list>

Smooks smooks = new Smooks("smooks-config.xml");
try {
    smooks.filterSource(new StreamSource(new FileInputStream("input-message.xml")), new StreamResult(System.out));
} finally {
    smooks.close();
}

//Get the data to filter
StreamSource source = new StreamSource(getClass().getResourceAsStream("data.xml"));

//Create a Smooks instance (cachable)
Smooks smooks = new Smooks("smooks-config.xml");

//Create the JavaResult, which will contain the filter result after filtering
JavaResult result = new JavaResult();

//Filter the data from the source, putting the result into the JavaResult
smooks.filterSource(source, result);

//Getting the Order bean which was created by the JavaBean cartridge
Order order = (Order)result.getBean("order");

public void filterSource(Source source, Result... results) throws SmooksException

Smooks smooks = new Smooks("/smooks/smooks-transform-x.xml");
ExecutionContext execContext = smooks.createExecutionContext();

execContext.setEventListener(new HtmlReportGenerator("/tmp/smooks-report.html"));
smooks.filterSource(execContext, new StreamSource(inputStream), new StreamResult(outputStream));

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" 
   xmlns:core="http://www.milyn.org/xsd/smooks/smooks-core-1.3.xsd">

    <!-- Visitors... -->
    <core:terminate onElement="customer" />

</smooks-resource-list>

<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" 
   xmlns:core="http://www.milyn.org/xsd/smooks/smooks-core-1.3.xsd">

   <!-- Visitors... -->

   <core:terminate onElement="customer" terminateBefore="true" />

</smooks-resource-list>