Change EmptyCursor to Kotlin

app/core/src/main/java/com/fsck/k9/helper/EmptyCursor.kt

@@ -1,54 +1,26 @@
-package com.fsck.k9.helper;
-
-import android.database.AbstractCursor;
+package com.fsck.k9.helper
 
+import android.database.AbstractCursor
 
 /**
- * A dummy class that provides a empty cursor
+ * A dummy class that provides an empty cursor
  */
-public class EmptyCursor extends AbstractCursor {
-    @Override
-    public int getCount() {
-        return 0;
-    }
+class EmptyCursor : AbstractCursor() {
+    override fun getCount() = 0
 
-    @Override
-    public String[] getColumnNames() {
-        return new String[0];
-    }
+    override fun getColumnNames() = arrayOf<String>()
 
-    @Override
-    public String getString(int column) {
-        return null;
-    }
+    override fun getString(column: Int) = null
 
-    @Override
-    public short getShort(int column) {
-        return 0;
-    }
+    override fun getShort(column: Int): Short = 0
 
-    @Override
-    public int getInt(int column) {
-        return 0;
-    }
+    override fun getInt(column: Int) = 0
 
-    @Override
-    public long getLong(int column) {
-        return 0;
-    }
+    override fun getLong(column: Int): Long = 0
 
-    @Override
-    public float getFloat(int column) {
-        return 0;
-    }
+    override fun getFloat(column: Int) = 0f
 
-    @Override
-    public double getDouble(int column) {
-        return 0;
-    }
+    override fun getDouble(column: Int) = 0.0
 
-    @Override
-    public boolean isNull(int column) {
-        return false;
-    }
-}
+    override fun isNull(column: Int) = true
+}