Analysis and Caching

case class AnalysisMap private[AnalysisMap] (
  analysisLocations: Map[File, FileFPrint], // Map of classpath entries to cache file fingerprints
  log: Logger                               // Logger for analysis operations
) {
  /**
   * Check if a classpath entry defines a specific class
   * @param classpathEntry Classpath entry to check
   * @return Function to test class definition
   */
  def definesClass(classpathEntry: File): String => Boolean
  
  /**
   * Get analysis information for a classpath entry
   * @param classpathEntry Classpath entry to analyze
   * @return Optional analysis data
   */
  def getAnalysis(classpathEntry: File): Option[Analysis]
}

object AnalysisMap {
  /**
   * Create AnalysisMap with file fingerprints for cache validation
   * @param analysisLocations Mapping of classpath entries to analysis cache file locations
   * @param log Logger for analysis operations
   * @return AnalysisMap instance with fingerprint validation
   */
  def create(analysisLocations: Map[File, File], log: Logger): AnalysisMap
  
  /**
   * Create analysis store for cache file management
   * @param cacheFile Analysis cache file location
   * @return AnalysisStore for reading/writing analysis data
   */
  def cachedStore(cacheFile: File): AnalysisStore
}

class FileFPrint(val file: File, val fprint: String)

object FileFPrint {
  /**
   * Generate file fingerprint for cache validation
   * @param file File to fingerprint
   * @return Optional file fingerprint (None if file doesn't exist)
   */
  def fprint(file: File): Option[FileFPrint]
}

object Cache {
  /**
   * Create LRU cache with soft references
   * @param maxSize Maximum cache size
   * @return Cache instance with specified size limit
   */
  def apply[K <: AnyRef, V <: AnyRef](maxSize: Int): gcache.Cache[K, V]
}

// Implicit extensions for cache operations
implicit class CacheExtensions[K <: AnyRef, V <: AnyRef](cache: gcache.Cache[K, V]) {
  /**
   * Get value from cache or compute and store if absent
   * @param key Cache key
   * @param value Value computation function
   * @return Cached or computed value
   */
  def getOrElseUpdate(key: K)(value: => V): V
  
  /**
   * Get all cache entries as sequence
   * @return Sequence of key-value pairs
   */
  def entries: Seq[(K, V)]
}

import org.pantsbuild.zinc._
import org.pantsbuild.zinc.cache._
import java.io.File

// Create analysis mapping for dependency tracking
val analysisLocations = Map(
  new File("/path/to/upstream.jar") -> new File("/path/to/upstream-analysis.cache"),
  new File("/path/to/library.jar") -> new File("/path/to/library-analysis.cache")
)

val log = Loggers.create(Level.Info, color = true)
val analysisMap = AnalysisMap.create(analysisLocations, log)

// Check if a jar defines a specific class
val definesMyClass = analysisMap.definesClass(new File("/path/to/upstream.jar"))
val hasMyClass = definesMyClass("com.example.MyClass")

// Get analysis data for incremental compilation
val upstreamAnalysis = analysisMap.getAnalysis(new File("/path/to/upstream.jar"))

import org.pantsbuild.zinc.FileFPrint
import java.io.File

// Generate fingerprints for cache validation
val sourceFile = new File("src/main/scala/Example.scala")
val fingerprint = FileFPrint.fprint(sourceFile)

fingerprint match {
  case Some(fp) => 
    println(s"File: ${fp.file}, Fingerprint: ${fp.fprint}")
  case None => 
    println("File does not exist or cannot be read")
}

import org.pantsbuild.zinc.cache.Cache
import java.io.File

// Create LRU cache for compiler instances
val compilerCache = Cache[String, AnyRef](maxSize = 10)

// Cache operations with automatic computation
val cachedValue = compilerCache.getOrElseUpdate("scala-2.12.17") {
  // Expensive compiler creation operation
  createCompilerInstance("2.12.17")
}

// View all cached entries
val allEntries = compilerCache.entries
println(s"Cache contains ${allEntries.size} entries")

import org.pantsbuild.zinc._
import java.io.File

// Set up analysis mapping for incremental compilation
val settings = Settings.parse(args.toSeq).get
val inputs = Inputs(log, settings)

// Analysis mapping is automatically created from settings
val analysisMap = inputs.analysisMap

// Use in compilation process
val compiler = Compiler(Setup(settings), log)
compiler.compile(inputs, Some(new File(".")), reporter, progress)(log)

// Analysis data is automatically cached and reused for subsequent compilations

case class AnalysisOptions(
  cache: Option[File],              // Analysis cache file location
  cacheMap: Map[File, File]         // Mapping of dependency analysis locations
)