Set Variables

The SetVariables EIP is used for setting multiple Exchange variables at the same time.

Options

The Set Variables eip supports 0 options, which are listed below.

Name Description Default Type

note

Sets the note of this node.

String

description

Sets the description of this node.

String

disabled

Disables this EIP from the route.

false

Boolean

variables

Required Contains the variables to be set.

List

Exchange properties

The Set Variables eip has no exchange properties.

Using Set Variables

The following example shows how to set multiple variables in a Camel route using Java, XML or YAML. Note that the syntax is slightly different in each case.

  • Java

  • XML

  • YAML

from("direct:a")
    .setVariables("myVar", constant("test"), "otherVar", constant("other"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setVariables>
        <setVariable name="myVar">
            <constant>test</constant>
        </setVariable>
        <setVariable name="otherVar">
            <constant>other</constant>
        </setVariable>
    </setVariables>
    <to uri="direct:b"/>
</route>
- route:
    from:
      uri: direct:a
      steps:
        - setVariables:
            variables:
              - name: myVar
                constant: test
              - name: otherVar
                constant: other
        - to:
            uri: direct:b

For example, the variables values are constants.

Any of the Camel languages can be used, such as Simple.

  • Java

  • XML

  • YAML

from("direct:a")
    .setVariables("randomNumber", simple("${random(1,100)}"), "body", simple("${body}"))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setVariables>
        <setVariable name="randomNumber">
            <simple>${random(1,100)}</simple>
        </setVariable>
        <setVariable name="body">
            <simple>${body}</simple>
        </setVariable>
    </setVariables>
    <to uri="direct:b"/>
</route>
- route:
    from:
      uri: direct:a
      steps:
        - setVariables:
            variables:
              - name: randomNumber
                expression:
                  simple:
                    expression: "${random(1,100)}"
              - name: body
                expression:
                  simple:
                    expression: "${body}"
        - to:
            uri: direct:b

Setting a variable from another variable

You can also set several variables where later ones depend on earlier ones.

In the example, we first set the variable foo to the body and then set bar based on comparing foo with a value.

  • Java

  • XML

  • YAML

from("direct:a")
    .setVariables("foo", simple("${body}"), "bar", simple("${variable.foo} > 10", Boolean.class))
    .to("direct:b");
<route>
    <from uri="direct:a"/>
    <setVariables>
	    <setVariable name="foo">
			<simple>${body}</simple>
		</setVariable>
		<setVariable name="bar">
			<simple resultType="java.lang.Boolean">${variable.foo} > 10</simple>
		</setVariable>
	</setVariables>
    <to uri="direct:b"/>
</route>
- route:
    from:
      uri: direct:a
      steps:
        - setVariables:
            variables:
              - name: foo
                expression:
                  simple:
                    expression: "${body}"
              - name: bar
                expression:
                  simple:
                    expression: "${variable.foo} > 10"
                    resultType: "boolean"
        - to:
            uri: direct:b

Using a Map with Java DSL

It’s also possible to build a Map and pass it as the single argument to setVariables(). If the order in which the variables should be set is important, use a LinkedHashMap.

Java
private Map<String, Expression> variableMap = new java.util.LinkedHashMap<>();
variableMap.put("foo", ConstantLanguage.constant("ABC"));
variableMap.put("bar", ConstantLanguage.constant("XYZ"));

from("direct:startMap")
    .setVariables(variableMap)
    .to("direct:b");

If the ordering is not critical, then Map.of(name1, expr1, name2, expr2…​) can be used.

Java
from("direct:startMap")
    .setVariables(Map.of("foo", "ABC", "bar", "XYZ"))
    .to("direct:b");
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