move isEmpty() from Expression to Element

src/org/jetbrains/jet/j2k/ast/Element.java

@@ -8,6 +8,10 @@ import org.jetbrains.annotations.NotNull;
 public abstract class Element extends Node {
   public static final Element EMPTY_ELEMENT = new EmptyElement();
 
+  public boolean isEmpty() {
+    return false;
+  }
+
   /**
    * @author ignatov
    */
@@ -17,5 +21,10 @@ public abstract class Element extends Node {
     public String toKotlin() {
       return EMPTY;
     }
+
+    @Override
+    public boolean isEmpty() {
+      return true;
+    }
   }
 }

src/org/jetbrains/jet/j2k/ast/Expression.java

@@ -27,8 +27,4 @@ public abstract class Expression extends Statement {
   boolean isNullable() {
     return false;
   }
-
-  public boolean isEmpty() {
-    return false;
-  }
 }

src/org/jetbrains/jet/j2k/ast/Field.java

@@ -64,7 +64,7 @@ public class Field extends Member {
   public String toKotlin() {
     String modifier = modifiersToKotlin();
 
-    if (myInitializer.toKotlin().isEmpty()) // TODO: remove
+    if (myInitializer.isEmpty())
       return modifier + myIdentifier.toKotlin() + SPACE + COLON + SPACE + myType.toKotlin();
 
     return modifier + myIdentifier.toKotlin() + SPACE + COLON + SPACE + myType.toKotlin() + SPACE +

src/org/jetbrains/jet/j2k/ast/LocalVariable.java

@@ -27,7 +27,7 @@ public class LocalVariable extends Expression {
   @NotNull
   @Override
   public String toKotlin() {
-    if (myInitializer.toKotlin().isEmpty()) // TODO: remove
+    if (myInitializer.isEmpty())
       return myIdentifier.toKotlin() + SPACE + COLON + SPACE + myType.toKotlin();
 
     return myIdentifier.toKotlin() + SPACE + COLON + SPACE + myType.toKotlin() + SPACE +