8.5. Sort
Sort
The sort pattern is used to sort the contents of a message body, assuming that the message body contains a list of items that can be sorted.
By default, the contents of the message are sorted using a default comparator that handles numeric values or strings. You can provide your own comparator and you can specify an expression that returns the list to be sorted (the expression must be convertible to
java.util.List).
Java DSL example
The following example generates the list of items to sort by tokenizing on the line break character:
from("file://inbox").sort(body().tokenize("\n")).to("bean:MyServiceBean.processLine");
You can pass in your own comparator as the second argument to
sort():
from("file://inbox").sort(body().tokenize("\n"), new MyReverseComparator()).to("bean:MyServiceBean.processLine");XML configuration example
You can configure the same routes in Spring XML.
The following example generates the list of items to sort by tokenizing on the line break character:
<route>
<from uri="file://inbox"/>
<sort>
<simple>body</simple>
</sort>
<beanRef ref="myServiceBean" method="processLine"/>
</route>
And to use a custom comparator, you can reference it as a Spring bean:
<route>
<from uri="file://inbox"/>
<sort comparatorRef="myReverseComparator">
<simple>body</simple>
</sort>
<beanRef ref="MyServiceBean" method="processLine"/>
</route>
<bean id="myReverseComparator" class="com.mycompany.MyReverseComparator"/>
Besides
<simple>, you can supply an expression using any language you like, so long as it returns a list.
Options
The
sort DSL command supports the following options:
| Name | Default Value | Description |
|---|---|---|
comparatorRef
|
Refers to a custom java.util.Comparator to use for sorting the message body. Camel will by default use a comparator which does a A..Z sorting.
|
