[swagger-codegen] Generating single client for multiple API definitions

Description

When we use swagger codegen to generate client side SDKs, we are able to generate one SDK per API definition (for a given language). Please refer the example below.

Eg : If we have 2 APIs, say "GeoAPI" and "TimeAPI", we need to generate 2 SDKs (i.e - 2 separate jar files) with the existing implementation, since the library supports only one definition at a time.

Limitation here is, if someone needs to consume both "GeoAPI" and "TimeAPI", he needs to write 2 separate clients.

If a user can get a single jar file and include it in his project, he can use a single client to consume both "GeoAPI" and "TimeAPI". For that, we need to have root pom.xml file which builds the individual SDKs. (This root pom.xml should be created automatically by the library at the time of SDK generation.) In other words we need to generate one client from multiple swagger definitions.

Please let us know the possibility of this with the current implementation of swagger codegen.

Swagger-codegen version

2.2.0

Read the current SDK generation flow and the root pom.xml build structure, then trace how one Swagger definition becomes a client artifact. The requested outcome is an automatically generated root pom.xml that combines multiple API definitions into a single consumable client or jar; review the existing implementation and build behavior before defining acceptance tests.