Constant
Since Camel 1.5
The Constant Expression Language is really just a way to specify constant strings as a type of expression.
| This is a fixed constant value that is only set once during starting up the route, do not use this if you want dynamic values during routing. |
Constant Options
The Constant language supports 1 options, which are listed below.
| Name | Default | Java Type | Description |
|---|---|---|---|
trim |
|
|
Whether to trim the value to remove leading and trailing whitespaces and line breaks |
Example usage
The setHeader element of the Spring DSL can utilize a constant expression like:
<route>
<from uri="seda:a"/>
<setHeader headerName="theHeader">
<constant>the value</constant>
</setHeader>
<to uri="mock:b"/>
</route>in this case, the Message coming from the seda:a Endpoint will have 'theHeader' header set to the constant value 'the value'.
And the same example using Java DSL:
from("seda:a")
.setHeader("theHeader", constant("the value"))
.to("mock:b");