Add SimpleHeaderMapper implementation [INT-1439]

[spring-operator]

Mark Fisher opened INT-1439 and commented

This implementation of HeaderMapper can be used for any case where the source/target type is simply a Map instance, e.g.:

public class SimpleHeaderMapper implements HeaderMapper<Map> {

   // something like this (and an inbound version)
   // see DefaultHttpHeaderMapper as an example
   public void setOutboundHeaderNames(String[] outboundHeaderNames) {

}

We would also need to support wildcard matching on the map keys, eg:

<something mapped-inbound-headers="foo, x-*"/>

For cases where we want to allow a Map of String keys and Expression values, we might want to add a new implementation, such as ExpressionEvaluatingHeaderMapper.

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No further details from INT-1439

[spring-operator]

Oleg Zhurakousky commented

Does not seem to be an essential feature. Set for 2.2

[spring-operator]

Mark Fisher commented

moving to M2 - may be irrelevant