Remove AnalysisCallback.{beginSource, endSource} methods.

As pointed out by @harrah in #705, both beginSource and endSource are
not used in sbt internally for anything meaningful.

We've discussed an option of deprecating those methods but since they
are not doing anything meaningful Mark prefers to have compile-time
error in case somebody implements or calls those methods. I agree with
that hence removal.

compile/inc/src/main/scala/sbt/inc/Compile.scala

@@ -151,9 +151,6 @@ private final class AnalysisCallback(internalMap: File => Option[File], external
 		apis(sourceFile) = (HashAPI(source), savedSource)
 	}
 
-	def endSource(sourcePath: File): Unit =
-		assert(apis.contains(sourcePath))
-
 	def get: Analysis = addCompilation( addExternals( addBinaries( addProducts( addSources(Analysis.Empty) ) ) ) )
 	def addProducts(base: Analysis): Analysis = addAll(base, classes) { case (a, src, (prod, name)) => a.addProduct(src, prod, current product prod, name ) }
 	def addBinaries(base: Analysis): Analysis = addAll(base, binaryDeps)( (a, src, bin) => a.addBinaryDep(src, bin, binaryClassName(bin), current binary bin) )
@@ -178,6 +175,4 @@ private final class AnalysisCallback(internalMap: File => Option[File], external
 			(outer /: bs) { (inner, b) =>
 				f(inner, a, b)
 		} }
-
-	def beginSource(source: File) {}
 }

compile/interface/src/main/scala/xsbt/Analyzer.scala

@@ -31,7 +31,6 @@ final class Analyzer(val global: CallbackGlobal) extends LocateClassFile
 			{
 				// build dependencies structure
 				val sourceFile = unit.source.file.file
-				callback.beginSource(sourceFile)
 				for(on <- unit.depends) processDependency(on, inherited=false)
 				for(on <- inheritedDependencies.getOrElse(sourceFile, Nil: Iterable[Symbol])) processDependency(on, inherited=true)
 				def processDependency(on: Symbol, inherited: Boolean)
@@ -75,7 +74,6 @@ final class Analyzer(val global: CallbackGlobal) extends LocateClassFile
 					else
 						addGenerated(false)
 				}
-				callback.endSource(sourceFile)
 			}
 		}
 	}

interface/src/main/java/xsbti/AnalysisCallback.java

@@ -7,8 +7,6 @@ import java.io.File;
 
 public interface AnalysisCallback
 {
-	/** Called before the source at the given location is processed. */
-	public void beginSource(File source);
 	/** Called to indicate that the source file <code>source</code> depends on the source file
 	* <code>dependsOn</code>.  Note that only source files included in the current compilation will
 	* passed to this method.  Dependencies on classes generated by sources not in the current compilation will
@@ -24,8 +22,6 @@ public interface AnalysisCallback
 	/** Called to indicate that the source file <code>source</code> produces a class file at
 	* <code>module</code> contain class <code>name</code>.*/
 	public void generatedClass(File source, File module, String name);
-	/** Called after the source at the given location has been processed. */
-	public void endSource(File sourcePath);
 	/** Called when the public API of a source file is extracted. */
 	public void api(File sourceFile, xsbti.api.SourceAPI source);
 	/** Provides problems discovered during compilation.  These may be reported (logged) or unreported.

interface/src/test/scala/TestCallback.scala

@@ -5,19 +5,14 @@ package xsbti
 
 class TestCallback extends AnalysisCallback
 {
-	val beganSources = new ArrayBuffer[File]
-	val endedSources = new ArrayBuffer[File]
 	val sourceDependencies = new ArrayBuffer[(File, File, Boolean)]
 	val binaryDependencies = new ArrayBuffer[(File, String, File, Boolean)]
 	val products = new ArrayBuffer[(File, File, String)]
 	val apis = new ArrayBuffer[(File, xsbti.api.SourceAPI)]
 
-	def beginSource(source: File) { beganSources += source }
-
 	def sourceDependency(dependsOn: File, source: File, inherited: Boolean) { sourceDependencies += ((dependsOn, source, inherited)) }
 	def binaryDependency(binary: File, name: String, source: File, inherited: Boolean) { binaryDependencies += ((binary, name, source, inherited)) }
 	def generatedClass(source: File, module: File, name: String) { products += ((source, module, name)) }
-	def endSource(source: File) { endedSources += source }
 
 	def api(source: File, sourceAPI: xsbti.api.SourceAPI) { apis += ((source, sourceAPI)) }
 	def problem(category: String, pos: xsbti.Position, message: String, severity: xsbti.Severity, reported: Boolean) {}

util/classfile/src/main/scala/sbt/classfile/Analyze.scala

@@ -33,7 +33,6 @@ private[sbt] object Analyze
 			sourceFile <- classFile.sourceFile orElse guessSourceName(newClass.getName);
 			source <- guessSourcePath(sourceMap, classFile, log))
 		{
-			analysis.beginSource(source)
 			analysis.generatedClass(source, newClass, classFile.className)
 			productToSource(newClass) = source
 			sourceToClassFiles.getOrElseUpdate(source, new ArrayBuffer[ClassFile]) += classFile
@@ -69,13 +68,10 @@ private[sbt] object Analyze
 			val notInherited = classFiles.flatMap(_.types).toSet -- publicInherited
 			processDependencies(notInherited, false)
 			processDependencies(publicInherited, true)
-			analysis.endSource(source)
 		}
 
 		for( source <- sources filterNot sourceToClassFiles.keySet ) {
-			analysis.beginSource(source)
 			analysis.api(source, new xsbti.api.SourceAPI(Array(), Array()))
-			analysis.endSource(source)
 		}
 	}
 	private[this] def urlAsFile(url: URL, log: Logger): Option[File] =