software/no.uio.ifi.refaktor/src/no/uio/ifi/refaktor/extractors/ExtractAndMoveMethodPrefixesExtractor.java

   1 package no.uio.ifi.refaktor.extractors;
   2
   3 import no.uio.ifi.refaktor.utils.RefaktorDebug;
   4 import no.uio.ifi.refaktor.utils.SmartTextSelection;
   5
   6 import org.eclipse.jdt.core.ICompilationUnit;
   7 import org.eclipse.jdt.core.dom.ASTNode;
   8 import org.eclipse.jdt.core.dom.Assignment;
   9 import org.eclipse.jdt.core.dom.Expression;
  10 import org.eclipse.jdt.core.dom.ExpressionStatement;
  11 import org.eclipse.jdt.core.dom.Name;
  12 import org.eclipse.jdt.core.dom.SimpleName;
  13
  14 public class ExtractAndMoveMethodPrefixesExtractor extends UnionOfLongestCommonPrefixesExtractor {
  15
  16         private final PrefixSet unfixes = new PrefixSet();
  17         private PrefixSet safePrefixes = null;
  18
  19         public ExtractAndMoveMethodPrefixesExtractor(SmartTextSelection selection, ICompilationUnit icu) {
  20                 super(selection, icu);
  21         }
  22
  23         @Override
  24         public boolean visit(Assignment node) {
  25                 if (!nodeInSelection(node))
  26                         return false;
  27
  28                 addLeftHandSideToUnfixesIfSimpleName(node);
  29                 return true;
  30         }
  31
  32         private void addLeftHandSideToUnfixesIfSimpleName(Assignment node) {
  33                 Expression lhs = node.getLeftHandSide();
  34                 assert lhs instanceof Name;
  35                 Name name = (Name) lhs;
  36                 if (name.isSimpleName()) {
  37                         SimpleName simpleName = (SimpleName) name;
  38                         ASTNode parent = node.getParent();
  39                         assert parent instanceof ExpressionStatement;
  40                         Prefix p = new Prefix(simpleName, (ExpressionStatement) parent, getDocument());
  41                         RefaktorDebug.println("Unfix string: " + p.toString());
  42                         unfixes.add(p);
  43                 }
  44         }
  45
  46         public PrefixSet getSafePrefixes() {
  47                 if (safePrefixes == null) {
  48                         safePrefixes = createSafePrefixes();
  49                 }
  50                 return safePrefixes;
  51         }
  52
  53         private PrefixSet createSafePrefixes() {
  54                 return getPrefixSet().minusShadowedPrefixes(unfixes);
  55         }
  56
  57         @Override
  58         public boolean hasUsefulResults() {
  59                 return !getSafePrefixes().isEmpty();
  60         }
  61 }