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32.7. Predicates
Basic predicates Copiar o linkLink copiado para a área de transferência!
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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");
from("direct:tie")
    .filter().xpath("/person/city = 'London'").to("file:target/messages/uk");
					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");
from("direct:tie")
    .choice()
        .when(xpath("/person/city = 'London'")).to("file:target/messages/uk")
        .otherwise().to("file:target/messages/others");
XPath predicate operators Copiar o linkLink copiado para a área de transferência!
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					The XPath language supports the standard XPath predicate operators, as shown in Table 32.2, “Operators for the XPath Language”.
				
| Operator | Description | 
|---|---|
= | Equals. | 
!= | Not equal to. | 
> | Greater than. | 
>= | Greater than or equals. | 
< | Less than. | 
<= | Less than or equals. | 
or | Combine two predicates with logical and. | 
and | Combine two predicates with logical inclusive or. | 
not() | Negate predicate argument. |