Validate
Available as of Camel 2.3
Validate uses an expression or predicates to validate the contents of a message. It is useful for ensuring that messages are valid before attempting to process them.
You can use the validate DSL with all kind of Predicates and Expressions. Validate evaluates the Predicate/Expression and if it is false a PredicateValidationException is thrown. If it is true message processing continues.
Using from Java DSL
The route below will read the file contents and validate them against a regular expression.
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from("file://inbox")
.validate(body(String.class).regex("^\\w{10}\\,\\d{2}\\,\\w{24}$"))
.to("bean:MyServiceBean.processLine");
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Validate is not limited to the message body. You can also validate the message header.
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from("file://inbox")
.validate(header("bar").isGreaterThan(100))
.to("bean:MyServiceBean.processLine");
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You can also use validate together with simple.
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from("file://inbox")
.validate(simple("${in.header.bar} == 100"))
.to("bean:MyServiceBean.processLine");
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Using from Spring DSL
To use validate in the Spring DSL, the easiest way is to use simple expressions.
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<route>
<from uri="file://inbox"/>
<validate>
<simple>${body} regex ^\\w{10}\\,\\d{2}\\,\\w{24}$</simple>
</validate>
<beanRef ref="myServiceBean" method="processLine"/>
</route>
<bean id="myServiceBean" class="com.mycompany.MyServiceBean"/>
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The XML DSL to validate the message header would looks like this:
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<route>
<from uri="file://inbox"/>
<validate>
<simple>${in.header.bar} == 100</simple>
</validate>
<beanRef ref="myServiceBean" method="processLine"/>
</route>
<bean id="myServiceBean" class="com.mycompany.MyServiceBean"/>
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