conditional expression added

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

@@ -1,9 +1,11 @@
 package org.jetbrains.jet.j2k.ast;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * @author ignatov
  */
-public class IfStatement extends Statement {
+public class IfStatement extends Expression {
   private final Expression myCondition;
   private final Statement myThenStatement;
   private final Statement myElseStatement;
@@ -14,6 +16,7 @@ public class IfStatement extends Statement {
     myElseStatement = elseStatement;
   }
 
+  @NotNull
   @Override
   public String toKotlin() {
     String result = "if" + SPACE + "(" + myCondition.toKotlin() + ")" + N + myThenStatement.toKotlin() + N;

src/org/jetbrains/jet/j2k/visitors/ExpressionVisitor.java

@@ -112,6 +112,13 @@ public class ExpressionVisitor extends StatementVisitor implements Visitor {
   @Override
   public void visitConditionalExpression(PsiConditionalExpression expression) {
     super.visitConditionalExpression(expression);
+    myResult = new ParenthesizedExpression(
+      new IfStatement(
+        expressionToExpression(expression.getCondition()),
+        expressionToExpression(expression.getThenExpression()),
+        expressionToExpression(expression.getElseExpression())
+      )
+    );
   }
 
   @Override

test/org/jetbrains/jet/j2k/ast/ConditionalExpressionTest.java

@@ -0,0 +1,19 @@
+package org.jetbrains.jet.j2k.ast;
+
+import junit.framework.Assert;
+import org.jetbrains.jet.j2k.JetTestCaseBase;
+
+/**
+ * @author ignatov
+ */
+public class ConditionalExpressionTest extends JetTestCaseBase {
+  public void testSimpleConditionalExpression() throws Exception {
+    Assert.assertEquals(
+      expressionToKotlin("a.isEmpty() ? 0 : 1"),
+      "(if (a.isEmpty())\n" +
+        "0\n" +
+        "else\n" +
+        "1)"
+    );
+  }
+}