software/no.uio.ifi.refaktor/src/no/uio/ifi/refaktor/utils/CompilationUnitRecentlyUsedCache.java

   1 package no.uio.ifi.refaktor.utils;
   2
   3 import org.eclipse.jdt.core.ICompilationUnit;
   4 import org.eclipse.jdt.core.dom.CompilationUnit;
   5
   6 public class CompilationUnitRecentlyUsedCache implements CompilationUnitCache {
   7
   8         private ICompilationUnit unit;
   9         private Long modificationStamp;
  10         private CompilationUnit concreteCompilationUnit;
  11
  12         @Override
  13         public boolean contains(ICompilationUnit unit) {
  14                 if (!hasMatchingCompilationUnit(unit))
  15                         return false;
  16
  17                 if (CacheCompilationUnitUtils.hasMatchingModificationStamp(unit, modificationStamp)) {
  18                         return true;
  19                 }
  20
  21                 cleanCache();
  22                 return false;
  23         }
  24
  25         @Override
  26         public CompilationUnit get(ICompilationUnit unit) {
  27                 return hasMatchingCompilationUnit(unit) ? concreteCompilationUnit : null;
  28         }
  29
  30         private boolean hasMatchingCompilationUnit(ICompilationUnit unit) {
  31                 return this.unit != null && this.unit.equals(unit);
  32         }
  33
  34         private void cleanCache() {
  35                 unit = null;
  36                 modificationStamp = null;
  37                 concreteCompilationUnit = null;
  38         }
  39
  40         @Override
  41         public void add(ICompilationUnit unit, CompilationUnit concreteCompilationUnit) {
  42                 this.unit = unit;
  43                 this.concreteCompilationUnit = concreteCompilationUnit;
  44                 modificationStamp = CacheCompilationUnitUtils.getModificationStampOf(unit);
  45         }
  46
  47 }