remove simple mapper

lib/src/main/java/de/siegmar/fastcsv/reader/CsvCallbackHandler.java

@@ -1,15 +1,13 @@
 package de.siegmar.fastcsv.reader;
 
-import java.util.Objects;
-
 /**
  * This class defines the methods that are called during the CSV reading process.
  * <p>
  * Implementations highly affect the behavior of the {@link CsvReader}. With great power comes great responsibility.
  * Don't mess up the CSV reading process!
  * <p>
  * Even if you need custom handling, you typically don't need to extend this class directly.
- * Check out {@link #forSimpleMapper(SimpleCsvMapper)} and {@link AbstractBaseCsvCallbackHandler} first.
+ * Check out {@link AbstractBaseCsvCallbackHandler} first.
  *
  * @param <T> the type of the record that is built from the CSV data
  */
@@ -22,26 +20,6 @@ public abstract class CsvCallbackHandler<T> {
     protected CsvCallbackHandler() {
     }
 
-    /**
-     * Constructs a callback handler for the given {@link SimpleCsvMapper}.
-     * <p>
-     * The returned callback handler is stateful and must not be reused.
-     *
-     * @param <T>    the type of the resulting records
-     * @param mapper the mapper
-     * @return a callback handler that returns a mapped record for each record
-     * @throws NullPointerException if {@code mapper} is {@code null}
-     */
-    public static <T> CsvCallbackHandler<T> forSimpleMapper(final SimpleCsvMapper<T> mapper) {
-        Objects.requireNonNull(mapper, "mapper must not be null");
-        return new AbstractCsvCallbackHandler<>() {
-            @Override
-            protected RecordWrapper<T> buildRecord() {
-                return buildWrapper(mapper.map(compactFields()));
-            }
-        };
-    }
-
     /**
      * Called at the beginning of each record.
      * <p>

lib/src/test/java/de/siegmar/fastcsv/reader/CsvCallbackHandlerTest.java

@@ -60,16 +60,6 @@ void stringArrayFieldModifier() {
             .containsExactly("foo", "bar");
     }
 
-    @Test
-    void simpleMapper() {
-        final CsvCallbackHandler<String[]> rh = CsvCallbackHandler
-            .forSimpleMapper(fields -> new String[]{fields[1], fields[0]});
-        process(rh);
-
-        assertThat(rh.buildRecord().wrappedRecord())
-            .containsExactly("bar", "foo");
-    }
-
     private static void process(final CsvCallbackHandler<?> rh) {
         rh.beginRecord(1);
         addField(rh, "foo");