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32.5. Enabling Saxon

Prerequisites
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A prerequisite for using the Saxon parser is that you add a dependency on the camel-saxon artifact (either adding this dependency to your Maven POM, if you use Maven, or adding the camel-saxon-6.2.1.redhat-084.jar file to your classpath, otherwise).

Using the Saxon parser in Java DSL
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In Java DSL, the simplest way to enable the Saxon parser is to call the saxon() fluent builder method. For example, you could invoke the Saxon parser as shown in the following example: 
// Java
// create a builder to evaluate the xpath using saxon
XPathBuilder builder = XPathBuilder.xpath("tokenize(/foo/bar, '_')[2]").saxon();

// evaluate as a String result
String result = builder.evaluate(context, "<foo><bar>abc_def_ghi</bar></foo>");
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Using the Saxon parser in XML DSL
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In XML DSL, the simplest way to enable the Saxon parser is to set the saxon attribute to true in the xpath element. For example, you could invoke the Saxon parser as shown in the following example: 
<xpath saxon="true" resultType="java.lang.String">current-dateTime()</xpath>
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Programming with Saxon
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If you want to use the Saxon XML parser in your application code, you can create an instance of the Saxon transformer factory explicitly using the following code: 
// Java
import javax.xml.transform.TransformerFactory;
import net.sf.saxon.TransformerFactoryImpl;
...
TransformerFactory saxonFactory = new net.sf.saxon.TransformerFactoryImpl();
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On the other hand, if you prefer to use the generic JAXP API to create a transformer factory instance, you must first set the javax.xml.transform.TransformerFactory property in the ESBInstall/etc/system.properties file, as follows: 
javax.xml.transform.TransformerFactory=net.sf.saxon.TransformerFactoryImpl
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You can then instantiate the Saxon factory using the generic JAXP API, as follows: 
// Java
import javax.xml.transform.TransformerFactory;
...
TransformerFactory factory = TransformerFactory.newInstance();
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If your application depends on any third-party libraries that use Saxon, it might be necessary to use the second, generic approach.
Note
The Saxon library must be installed in the container as the OSGi bundle, net.sf.saxon/saxon9he (normally installed by default). In versions of Fuse ESB prior to 7.1, it is not possible to load Saxon using the generic JAXP API.
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