Package org.codehaus.groovy.control

Class ClassNodeResolver

java.lang.Object
org.codehaus.groovy.control.ClassNodeResolver
public class ClassNodeResolver
extends Object
This class is used as a pluggable way to resolve class names. An instance of this class has to be added to CompilationUnit using CompilationUnit.setClassNodeResolver(ClassNodeResolver). The CompilationUnit will then set the resolver on the ResolveVisitor each time new. The ResolveVisitor will prepare name lookup and then finally ask the resolver if the class exists. This resolver then can return either a SourceUnit or a ClassNode. In case of a SourceUnit the compiler is notified that a new source is to be added to the compilation queue. In case of a ClassNode no further action than the resolving is done. The lookup result is stored in the helper class ClassNodeResolver.LookupResult. This class provides a class cache to cache lookups. If you don't want this, you have to override the methods cacheClass(String, ClassNode) and getFromClassCache(String). Custom lookup logic is supposed to go into the method findClassNode(String, CompilationUnit) while the entry method is resolveName(String, CompilationUnit)

  • Field Details

    • NO_CLASS

      protected static final ClassNode NO_CLASS
      Internal helper used to indicate a cache hit for a class that does not exist. This way further lookups through a slow findClassNode(String, CompilationUnit) path can be avoided. WARNING: This class is not to be used outside of ClassNodeResolver.

  • Constructor Details

    • ClassNodeResolver

      public ClassNodeResolver()

  • Method Details

    • resolveName

      public ClassNodeResolver.LookupResult resolveName​(String name, CompilationUnit compilationUnit)
      Resolves the name of a class to a SourceUnit or ClassNode. If no class or source is found this method returns null. A lookup is done by first asking the cache if there is an entry for the class already available to then call findClassNode(String, CompilationUnit). The result of that method call will be cached if a ClassNode is found. If a SourceUnit is found, this method will not be asked later on again for that class, because ResolveVisitor will first ask the CompilationUnit for classes in the compilation queue and it will find the class for that SourceUnit there then. method return a ClassNode instead of a SourceUnit, the res
      Parameters:
      name - - the name of the class
      compilationUnit - - the current CompilationUnit
      Returns:
      the LookupResult

    • cacheClass

      public void cacheClass​(String name, ClassNode res)
      caches a ClassNode
      Parameters:
      name - - the name of the class
      res - - the ClassNode for that name

    • getFromClassCache

      public ClassNode getFromClassCache​(String name)
      returns whatever is stored in the class cache for the given name
      Parameters:
      name - - the name of the class
      Returns:
      the result of the lookup, which may be null

    • findClassNode

      public ClassNodeResolver.LookupResult findClassNode​(String name, CompilationUnit compilationUnit)
      Extension point for custom lookup logic of finding ClassNodes. Per default this will use the CompilationUnit class loader to do a lookup on the class path and load the needed class using that loader. Or if a script is found and that script is seen as "newer", the script will be used instead of the class.
      Parameters:
      name - - the name of the class
      compilationUnit - - the current compilation unit
      Returns:
      the lookup result