Support navigation to get/set methods of a property delegate, if they are in the source code

compiler/frontend/src/org/jetbrains/jet/lang/psi/JetPropertyDelegate.java

@@ -17,8 +17,12 @@
 package org.jetbrains.jet.lang.psi;
 
 import com.intellij.lang.ASTNode;
+import com.intellij.psi.PsiReference;
+import com.intellij.psi.PsiReferenceService;
+import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.jet.lexer.JetTokens;
 
 public class JetPropertyDelegate extends JetElementImpl {
     public JetPropertyDelegate(@NotNull ASTNode node) {
@@ -30,6 +34,19 @@ public class JetPropertyDelegate extends JetElementImpl {
         return findChildByClass(JetExpression.class);
     }
 
+    @Override
+    public PsiReference getReference() {
+        PsiReference[] references = getReferences();
+        if (references.length == 1) return references[0];
+        return null;
+    }
+
+    @NotNull
+    @Override
+    public PsiReference[] getReferences() {
+        return ReferenceProvidersRegistry.getReferencesFromProviders(this, PsiReferenceService.Hints.NO_HINTS);
+    }
+
     @Override
     public void accept(@NotNull JetVisitorVoid visitor) {
         visitor.visitPropertyDelegate(this);
@@ -39,4 +56,10 @@ public class JetPropertyDelegate extends JetElementImpl {
     public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
         return visitor.visitPropertyDelegate(this, data);
     }
+
+    @NotNull
+    public ASTNode getByKeywordNode() {
+        //noinspection ConstantConditions
+        return getNode().findChildByType(JetTokens.BY_KEYWORD);
+    }
 }