mirror of https://github.com/sbt/sbt.git
better location for class loaders (ClassLoaders.scala)
This commit is contained in:
Mark Harrah
parent
897f9ca3d1
commit
d09aab03be
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@ -42,3 +42,90 @@ class SelfFirstLoader(classpath: Seq[URL], parent: ClassLoader) extends LoaderBa
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catch { case _: ClassNotFoundException => defaultLoadClass(className) }
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catch { case _: ClassNotFoundException => defaultLoadClass(className) }
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}
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}
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}
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}
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private class IntermediateLoader(urls: Array[URL], parent: ClassLoader) extends LoaderBase(urls, parent)
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{
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def doLoadClass(className: String): Class[_] =
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{
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// if this loader is asked to load an sbt class, it must be because the project we are building is sbt itself,
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// so we want to load the version of classes on the project classpath, not the parent
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if(className.startsWith(Loaders.SbtPackage))
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findClass(className)
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else
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defaultLoadClass(className)
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}
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}
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/** Delegates class loading to `parent` for all classes included by `filter`. An attempt to load classes excluded by `filter`
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* results in a `ClassNotFoundException`.*/
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class FilteredLoader(parent: ClassLoader, filter: ClassFilter) extends ClassLoader(parent)
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{
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require(parent != null) // included because a null parent is legitimate in Java
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def this(parent: ClassLoader, excludePackages: Iterable[String]) = this(parent, new ExcludePackagesFilter(excludePackages))
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@throws(classOf[ClassNotFoundException])
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override final def loadClass(className: String, resolve: Boolean): Class[_] =
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{
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if(filter.include(className))
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super.loadClass(className, resolve)
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else
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throw new ClassNotFoundException(className)
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}
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}
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private class SelectiveLoader(urls: Array[URL], parent: ClassLoader, filter: ClassFilter) extends URLClassLoader(urls, parent)
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{
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require(parent != null) // included because a null parent is legitimate in Java
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def this(urls: Array[URL], parent: ClassLoader, includePackages: Iterable[String]) = this(urls, parent, new IncludePackagesFilter(includePackages))
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@throws(classOf[ClassNotFoundException])
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override final def loadClass(className: String, resolve: Boolean): Class[_] =
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{
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if(filter.include(className))
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super.loadClass(className, resolve)
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else
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{
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val loaded = parent.loadClass(className)
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if(resolve)
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resolveClass(loaded)
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loaded
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}
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}
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}
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trait ClassFilter
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{
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def include(className: String): Boolean
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}
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abstract class PackageFilter(packages: Iterable[String]) extends ClassFilter
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{
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require(packages.forall(_.endsWith(".")))
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protected final def matches(className: String): Boolean = packages.exists(className.startsWith)
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}
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class ExcludePackagesFilter(exclude: Iterable[String]) extends PackageFilter(exclude)
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{
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def include(className: String): Boolean = !matches(className)
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}
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class IncludePackagesFilter(include: Iterable[String]) extends PackageFilter(include)
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{
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def include(className: String): Boolean = matches(className)
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}
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private[sbt] class LazyFrameworkLoader(runnerClassName: String, urls: Array[URL], parent: ClassLoader, grandparent: ClassLoader)
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extends LoaderBase(urls, parent)
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{
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def doLoadClass(className: String): Class[_] =
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{
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if(Loaders.isNestedOrSelf(className, runnerClassName))
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findClass(className)
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else if(Loaders.isSbtClass(className)) // we circumvent the parent loader because we know that we want the
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grandparent.loadClass(className) // version of sbt that is currently the builder (not the project being built)
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else
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parent.loadClass(className)
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}
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}
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private object Loaders
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{
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val SbtPackage = "sbt."
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def isNestedOrSelf(className: String, checkAgainst: String) =
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className == checkAgainst || className.startsWith(checkAgainst + "$")
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def isSbtClass(className: String) = className.startsWith(Loaders.SbtPackage)
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}
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@ -129,89 +129,3 @@ object ClasspathUtilities
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set
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set
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}
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}
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}
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}
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private class IntermediateLoader(urls: Array[URL], parent: ClassLoader) extends LoaderBase(urls, parent)
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{
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def doLoadClass(className: String): Class[_] =
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{
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// if this loader is asked to load an sbt class, it must be because the project we are building is sbt itself,
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// so we want to load the version of classes on the project classpath, not the parent
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if(className.startsWith(Loaders.SbtPackage))
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findClass(className)
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else
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defaultLoadClass(className)
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}
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}
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/** Delegates class loading to `parent` for all classes included by `filter`. An attempt to load classes excluded by `filter`
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* results in a `ClassNotFoundException`.*/
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class FilteredLoader(parent: ClassLoader, filter: ClassFilter) extends ClassLoader(parent)
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{
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require(parent != null) // included because a null parent is legitimate in Java
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def this(parent: ClassLoader, excludePackages: Iterable[String]) = this(parent, new ExcludePackagesFilter(excludePackages))
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@throws(classOf[ClassNotFoundException])
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override final def loadClass(className: String, resolve: Boolean): Class[_] =
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{
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if(filter.include(className))
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super.loadClass(className, resolve)
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else
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throw new ClassNotFoundException(className)
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}
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}
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private class SelectiveLoader(urls: Array[URL], parent: ClassLoader, filter: ClassFilter) extends URLClassLoader(urls, parent)
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{
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require(parent != null) // included because a null parent is legitimate in Java
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def this(urls: Array[URL], parent: ClassLoader, includePackages: Iterable[String]) = this(urls, parent, new IncludePackagesFilter(includePackages))
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@throws(classOf[ClassNotFoundException])
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override final def loadClass(className: String, resolve: Boolean): Class[_] =
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{
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if(filter.include(className))
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super.loadClass(className, resolve)
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else
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{
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val loaded = parent.loadClass(className)
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if(resolve)
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resolveClass(loaded)
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loaded
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}
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}
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}
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trait ClassFilter
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{
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def include(className: String): Boolean
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}
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abstract class PackageFilter(packages: Iterable[String]) extends ClassFilter
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{
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require(packages.forall(_.endsWith(".")))
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protected final def matches(className: String): Boolean = packages.exists(className.startsWith)
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}
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class ExcludePackagesFilter(exclude: Iterable[String]) extends PackageFilter(exclude)
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{
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def include(className: String): Boolean = !matches(className)
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}
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class IncludePackagesFilter(include: Iterable[String]) extends PackageFilter(include)
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{
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def include(className: String): Boolean = matches(className)
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}
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private[sbt] class LazyFrameworkLoader(runnerClassName: String, urls: Array[URL], parent: ClassLoader, grandparent: ClassLoader)
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extends LoaderBase(urls, parent)
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{
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def doLoadClass(className: String): Class[_] =
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{
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if(Loaders.isNestedOrSelf(className, runnerClassName))
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findClass(className)
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else if(Loaders.isSbtClass(className)) // we circumvent the parent loader because we know that we want the
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grandparent.loadClass(className) // version of sbt that is currently the builder (not the project being built)
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else
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parent.loadClass(className)
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}
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}
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private object Loaders
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{
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val SbtPackage = "sbt."
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def isNestedOrSelf(className: String, checkAgainst: String) =
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className == checkAgainst || className.startsWith(checkAgainst + "$")
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def isSbtClass(className: String) = className.startsWith(Loaders.SbtPackage)
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}
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