case-study/refaktor-before/src/no/uio/ifi/refaktor/analyze/collectors/AbstractPrefixCollector.java

   1 package no.uio.ifi.refaktor.analyze.collectors;
   2
   3 import no.uio.ifi.refaktor.prefix.Prefix;
   4 import no.uio.ifi.refaktor.textselection.CompilationUnitTextSelection;
   5
   6 import org.eclipse.jdt.core.dom.IVariableBinding;
   7 import org.eclipse.jdt.core.dom.QualifiedName;
   8 import org.eclipse.jdt.core.dom.SimpleName;
   9
  10 /**
  11  * An abstract property collector responsible for finding
  12  * prefixes within a selection.
  13  *
  14  * Subclasses are responsible for implementing the
  15  * {@link #registerPrefix(Prefix)} method. I.e. they
  16  * decide how to handle the encountered prefixes.
  17  */
  18 public abstract class AbstractPrefixCollector extends PropertyCollector {
  19
  20         public AbstractPrefixCollector(CompilationUnitTextSelection selection) {
  21                 super(selection);
  22         }
  23
  24         /**
  25          * Register a prefix encountered by the collector.
  26          * @param prefix The prefix to register.
  27          */
  28         protected abstract void registerPrefix(Prefix prefix);
  29
  30         @Override
  31         public boolean visit(QualifiedName node) {
  32                 if (!nodeInSelection(node))
  33                         return false;
  34
  35                 Prefix prefix = new Prefix(node);
  36                 if (prefix.firstExpressionIsBoundToVariable())
  37                         registerPrefix(prefix);
  38
  39                 // Must be false. Important to prevent double count for simple names.
  40                 return false;
  41         }
  42
  43         @Override
  44         public boolean visit(SimpleName node) {
  45                 if (!nodeInSelection(node))
  46                         return false;
  47
  48                 if (nodeIsUsageOfVariable(node))
  49                         registerPrefix(new Prefix(node));
  50
  51                 return false;
  52         }
  53
  54         private boolean nodeIsUsageOfVariable(SimpleName node) {
  55                 return !node.isDeclaration() && node.resolveBinding() instanceof IVariableBinding;
  56         }
  57 }