Support in BuildContext for other input than File

[andham]

Based on the jaxws-maven-plugin (https://jax-ws-commons.java.net/jaxws-maven-plugin/), there is a need for having support for other sorts of input in BuildContext than just File. The jaxws-m-p uses external WSDLs as well as WSDLs in JAR files on the classpath as input.

https://java.net/projects/jax-ws-commons/sources/svn/content/trunk/jaxws-maven-plugin/src/main/java/org/jvnet/jax_ws_commons/jaxws/WsImportMojo.java?rev=1184

[ifedorenko]

This is already implemented, but I didn't have enough usecases to validate the API and only exposed over DefaultBuildContext. I'll try to give more detailed answer on takari-dev later today, but in the meantime have a look at ResourceHolder interface and FileState implementation (DependencyResourceMockup example is rather misleading, so don't look there yet).