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Chapter 32. XQuery

Overview

XQuery was originally devised as a query language for data stored in XML form in a database. The XQuery language enables you to select parts of the current message, when the message is in XML format. XQuery is a superset of the XPath language; hence, any valid XPath expression is also a valid XQuery expression.

Java syntax

You can pass an XQuery expression to xquery() in several ways. For simple expressions, you can pass the XQuery expressions as a string (java.lang.String). For longer XQuery expressions, you might prefer to store the expression in a file, which you can then reference by passing a java.io.File argument or a java.net.URL argument to the overloaded xquery() method. The XQuery expression implicitly acts on the message content and returns a node set as the result. Depending on the context, the return value is interpreted either as a predicate (where an empty node set is interpreted as false) or as an expression.

Adding the Saxon module

To use XQuery in your routes you need to add a dependency on camel-saxon to your project as shown in Example 32.1, “Adding the camel-saxon dependency”.

Example 32.1. Adding the camel-saxon dependency

<!-- Maven POM File -->
...
<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-saxon</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>

Static import

To use the xquery() static method in your application code, include the following import statement in your Java source files:
import static org.apache.camel.builder.saxon.XQueryBuilder.xquery;

Variables

Table 32.1, “XQuery variables” lists the variables that are accessible when using XQuery.

Table 32.1. XQuery variables

VariableTypeDescription
exchangeExchangeThe current Exchange
in.bodyObjectThe body of the IN message
out.bodyObjectThe body of the OUT message
in.headers.keyObjectThe IN message header whose key is key
out.headers.keyObjectThe OUT message header whose key is key
keyObjectThe Exchange property whose key is key

Example

Example 32.2, “Route using XQuery” shows a route that uses XQuery.

Example 32.2. Route using XQuery

<camelContext>
  <route>
    <from uri="activemq:MyQueue"/>
    <filter>
      <language langauge="xquery">/foo:person[@name='James']</language>
      <to uri="mqseries:SomeOtherQueue"/>
    </filter>
  </route>
</camelContext>