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19.7. Predicates

Basic predicates
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You can use xpath in the Java DSL or the XML DSL in a context where a predicate is expected—for example, as the argument to a filter() processor or as the argument to a when() clause.
For example, the following route filters incoming messages, allowing a message to pass, only if the /person/city element contains the value, London: 
from("direct:tie")
    .filter().xpath("/person/city = 'London'").to("file:target/messages/uk");
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The following route evaluates the XPath predicate in a when() clause: 
from("direct:tie")
    .choice()
        .when(xpath("/person/city = 'London'")).to("file:target/messages/uk")
        .otherwise().to("file:target/messages/others");
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XPath predicate operators
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The XPath language supports the standard XPath predicate operators, as shown in Table 19.2, “Operators for the XPath Language”.
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Table 19.2. Operators for the XPath Language
OperatorDescription
=Equals.
!=Not equal to.
>Greater than.
>=Greater than or equals.
<Less than.
<=Less than or equals.
orCombine two predicates with logical and.
andCombine two predicates with logical inclusive or.
not()Negate predicate argument.
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