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[Scala] AOP merge strategy for assembly builds
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object BuildSettings { | |
private def assemblySettings = Seq( | |
test in assembly := {}, | |
assemblyMergeStrategy in assembly := { | |
case "META-INF/aop.xml" => aopMerge | |
case x => | |
val oldStrategy = (assemblyMergeStrategy in assembly).value | |
oldStrategy(x) | |
} | |
) | |
private val aopMerge: MergeStrategy = new MergeStrategy { | |
val name = "aopMerge" | |
import scala.xml._ | |
import scala.xml.dtd._ | |
def apply(tempDir: File, path: String, files: Seq[File]): Either[String, Seq[(File, String)]] = { | |
val dt = DocType("aspectj", PublicID("-//AspectJ//DTD//EN", "http://www.eclipse.org/aspectj/dtd/aspectj.dtd"), Nil) | |
val file = MergeStrategy.createMergeTarget(tempDir, path) | |
val xmls: Seq[Elem] = files.map(XML.loadFile) | |
val aspectsChildren: Seq[Node] = xmls.flatMap(_ \\ "aspectj" \ "aspects" \ "_") | |
val weaverChildren: Seq[Node] = xmls.flatMap(_ \\ "aspectj" \ "weaver" \ "_") | |
val options: String = xmls.map(x => (x \\ "aspectj" \ "weaver" \ "@options").text).mkString(" ").trim | |
val weaverAttr = if (options.isEmpty) Null else new UnprefixedAttribute("options", options, Null) | |
val aspects = new Elem(null, "aspects", Null, TopScope, false, aspectsChildren: _*) | |
val weaver = new Elem(null, "weaver", weaverAttr, TopScope, false, weaverChildren: _*) | |
val aspectj = new Elem(null, "aspectj", Null, TopScope, false, aspects, weaver) | |
XML.save(file.toString, aspectj, "UTF-8", xmlDecl = false, dt) | |
IO.append(file, IO.Newline.getBytes(IO.defaultCharset)) | |
Right(Seq(file -> path)) | |
} | |
} | |
} |
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