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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| package xsbt | ||
| import java.io.File | ||
| import java.nio.file.Paths | ||
| import java.util.zip.ZipFile | ||
|
|
||
| class STJ(outputDirs: Iterable[File]) { | ||
| type JaredClass = String | ||
| type RelClass = String | ||
|
|
||
| def init(jar: File, cls: RelClass): JaredClass = { | ||
| // This identifier will be stored as a java.io.File. Its constructor will normalize slashes | ||
| // which means that the identifier to be consistent should at all points have consistent | ||
| // slashes for safe comparisons, especially in sets or maps. | ||
| val relClass = if (File.separatorChar == '/') cls else cls.replace(File.separatorChar, '/') | ||
| s"$jar!$relClass" | ||
| } | ||
|
|
||
| def init(cls: RelClass): JaredClass = { | ||
| init(outputJar.get, cls) | ||
| } | ||
|
|
||
| def listFiles(jar: File): Set[RelClass] = { | ||
| import scala.collection.JavaConverters._ | ||
| // ZipFile is slightly slower than IndexBasedZipFsOps but it is quite difficult to use reuse | ||
| // IndexBasedZipFsOps in compiler bridge. | ||
| val zip = new ZipFile(jar) | ||
| try { | ||
| zip.entries().asScala.filterNot(_.isDirectory).map(_.getName).toSet | ||
| } finally { | ||
| zip.close() | ||
| } | ||
| } | ||
|
|
||
| val outputJar: Option[File] = { | ||
| outputDirs match { | ||
| case Seq(file) if file.getName.endsWith(".jar") => Some(file) | ||
| case _ => None | ||
| } | ||
| } | ||
|
|
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| val enabled: Boolean = outputJar.isDefined | ||
|
|
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| class PrevJarCache(rawClasspath: String) extends scala.collection.generic.Clearable { | ||
| private var cache: Set[JaredClass] = _ | ||
|
|
||
| private lazy val prevJar = { | ||
| val classpath = rawClasspath.split(File.pathSeparator) | ||
| findPrevJar(classpath) | ||
| } | ||
|
|
||
| def contains(jaredClass: JaredClass): Boolean = { | ||
| if (cache == null) { | ||
| cache = loadEntriesFromPrevJar() | ||
| } | ||
| cache.contains(jaredClass) | ||
| } | ||
|
|
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| def clear(): Unit = cache = null | ||
|
|
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| private def loadEntriesFromPrevJar(): Set[JaredClass] = { | ||
| prevJar | ||
| .filter(_.exists()) | ||
| .fold(Set.empty[JaredClass]) { prevJar => | ||
| val classes = listFiles(prevJar) | ||
| classes.map(init) | ||
| } | ||
| } | ||
| } | ||
|
|
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| private def findPrevJar(classpath: Seq[String]): Option[File] = { | ||
| classpath.headOption.map(new File(_)).filter { path => | ||
| val fileName = path.getName | ||
| fileName.startsWith(prevJarPrefix) && fileName.endsWith(".jar") | ||
| } | ||
| } | ||
|
|
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| private val prevJarPrefix: String = "prev-jar" | ||
|
|
||
| } |
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