Add failing test for #15, as well as tentative feature enum

Author: cowtowncoder

csv/src/main/java/com/fasterxml/jackson/dataformat/csv/CsvParser.java

@@ -62,11 +62,24 @@ public enum Feature
          * columns that appear after columns for which types are defined. When disabled,
          * an exception is thrown for such column values, but if enabled, they are
          * silently ignored.
+         *<p>
+         * Feature is disabled by default.
          *
          * @since 2.7
          */
         IGNORE_TRAILING_UNMAPPABLE(false),
 
+        /**
+         * Feature that allows skipping input lines that are completely empty, instead
+         * of being decoded as lines of just a single column with empty String value (or,
+         * depending on binding, `null`).
+         *<p>
+         * Feature is disabled by default.
+         *
+         * @since 2.9
+         */
+        SKIP_EMPTY_LINES(false),
+
         /**
          * Feature that allows there to be a trailing single extraneous data
          * column that is empty. When this feature is disabled, any extraneous

csv/src/test/java/com/fasterxml/jackson/dataformat/csv/failing/SkipEmptyLines15Test.java

@@ -0,0 +1,67 @@
+package com.fasterxml.jackson.dataformat.csv.failing;
+
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+import com.fasterxml.jackson.dataformat.csv.*;
+
+public class SkipEmptyLines15Test extends ModuleTestBase
+{
+    @JsonPropertyOrder({ "age", "name", "cute" })
+    protected static class Entry {
+        public int age;
+        public String name;
+        public boolean cute;
+    }
+
+    /*
+    /**********************************************************************
+    /* Test methods, success
+    /**********************************************************************
+     */
+
+    // for [dataformats-text#15]: Allow skipping of empty lines
+    public void testSkipEmptyLinesFeature() throws Exception
+    {
+        final String CSV = "1,\"xyz\"\n\ntrue,\n";
+        
+        CsvMapper mapper = mapperForCsv();
+        mapper.enable(CsvParser.Feature.WRAP_AS_ARRAY);
+
+        // First, verify default behavior:
+
+        String[][] rows = mapper.readValue(CSV, String[][].class);
+        assertEquals(3, rows.length);
+        String[] row;
+
+        row = rows[0];
+        assertEquals(2, row.length);
+        assertEquals("1",row[0]);
+        assertEquals("xyz", row[1]);
+
+        row = rows[1];
+        assertEquals(1, row.length);
+        assertEquals("", row[0]);
+
+        row = rows[2];
+        assertEquals(2, row.length);
+        assertEquals("true", row[0]);
+        assertEquals("", row[1]);
+
+        mapper.enable(CsvParser.Feature.SKIP_EMPTY_LINES);
+
+        // when wrapped as an array, we'll get array of Lists:
+        rows = mapper.readerFor(String[][].class)
+                .with(CsvParser.Feature.WRAP_AS_ARRAY)
+                .readValue(CSV);
+
+        assertEquals(2, rows.length);
+        row = rows[0];
+        assertEquals(2, row.length);
+        assertEquals("1",row[0]);
+        assertEquals("xyz", row[1]);
+
+        row = rows[1];
+        assertEquals(2, row.length);
+        assertEquals("true", row[0]);
+        assertEquals("", row[1]);
+    }
+}