Is there a way to write a filter in spring-integration using java annotation?

Question

I'm trying to convert xml configuration in spring-integration, and I encountered a filter that goes like:

<
  int:filter
  expression="someFilterExpression"
  input-channel="inputChannel"
  output-channel="outputChannel"
  discard-channel="discardChannel"
/>

Is there a way to come up with a Java annotation equivalent for this? I've tried to use the @Filter annotation, but it didn't include the expression field in there.

Answer 1

thanks for pointing me to the right direction. To elaborate further on what I did. I put in the spring integration dsl dependency

<dependency>
  <groupId>org.springframework.integration</groupId>
  <artifactId>spring-integration-java-dsl</artifactId>
  <version>1.2.3.RELEASE</version>
</dependency>

and used the IntegrationFlows to build the filter. I did it by:

@Bean
public IntegrationFlow filter() {
    return IntegrationFlows
        .from("someInputChannel")
        .filter(
            "someFilterExpression",
            e -> e.discardChannel("someDiscardChannel"))
        .channel("someOutputChannel")
        .get();
}

So, the above Java DSL is basically the same as:

<
  int:filter
  expression="someFilterExpression"
  input-channel="someInputChannel"
  output-channel="someOutputChannel"
  discard-channel="someDiscardChannel"
/>

Thank you very much again for your answer. :)