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StAX ComponentAvailable as of Camel 2.9 The StAX component allows messages to be process through a SAX ContentHandler. Maven users will need to add the following dependency to their
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-stax</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>
URI formatstax:content-handler-class example: stax:org.superbiz.FooContentHandler From Camel 2.11.1 onwards you can lookup a stax:#myHandler Usage of a content handler as StAX parserThe message body after the handling is the handler itself. Here an example:
from("file:target/in")
.to("stax:org.superbiz.handler.CountingHandler")
// CountingHandler implements org.xml.sax.ContentHandler or extends org.xml.sax.helpers.DefaultHandler
.process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
CountingHandler handler = exchange.getIn().getBody(CountingHandler.class);
// do some great work with the handler
}
});
Iterate over a collection using JAXB and StAXFirst we suppose you have JAXB objects. For instance a list of records in a wrapper object:
import java.util.ArrayList;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "records")
public class Records {
@XmlElement(required = true)
protected List<Record> record;
public List<Record> getRecord() {
if (record == null) {
record = new ArrayList<Record>();
}
return record;
}
}
and
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlType;
@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "record", propOrder = { "key", "value" })
public class Record {
@XmlAttribute(required = true)
protected String key;
@XmlAttribute(required = true)
protected String value;
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
Then you get a XML file to process: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <records> <record value="v0" key="0"/> <record value="v1" key="1"/> <record value="v2" key="2"/> <record value="v3" key="3"/> <record value="v4" key="4"/> <record value="v5" key="5"/> </record> The StAX component provides an
from("file:target/in")
.split(stax(Record.class)).streaming()
.to("mock:records");
Where
from("file:target/in")
.split(stax(Record.class, false)).streaming()
.to("mock:records");
The previous example with XML DSLThe example above could be implemented as follows in XML DSL Error rendering macro 'code': Invalid value specified for parameter 'java.lang.NullPointerException'
<!-- use STaXBuilder to create the expression we want to use in the route below for splitting the XML file -->
<!-- notice we use the factory-method to define the stax method, and to pass in the parameter as a constructor-arg -->
<bean id="staxRecord" class="org.apache.camel.component.stax.StAXBuilder" factory-method="stax">
<!-- FQN class name of the POJO with the JAXB annotations -->
<constructor-arg index="0" value="org.apache.camel.component.stax.model.Record"/>
</bean>
<camelContext xmlns="http://camel.apache.org/schema/spring">
<route>
<!-- pickup XML files -->
<from uri="file:target/in"/>
<split streaming="true">
<!-- split the file using StAX (ref to bean above) -->
<!-- and use streaming mode in the splitter -->
<ref>staxRecord</ref>
<!-- and send each splitted to a mock endpoint, which will be a Record POJO instance -->
<to uri="mock:records"/>
</split>
</route>
</camelContext>
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