More lambdas, less boilerplate.

Author: Gary Gregory

src/test/java/org/apache/commons/csv/CSVFileParserTest.java

@@ -69,13 +69,7 @@ private String readTestData() throws IOException {
     public static Collection<Object[]> generateData() {
         final List<Object[]> list = new ArrayList<>();
 
-        final FilenameFilter fileNameFilter = new FilenameFilter() {
-
-            @Override
-            public boolean accept(final File dir, final String name) {
-                return name.startsWith("test") && name.endsWith(".txt");
-            }
-        };
+        final FilenameFilter fileNameFilter = (dir, name) -> name.startsWith("test") && name.endsWith(".txt");
         final File[] files = BASE.listFiles(fileNameFilter);
         if (files != null) {
             for (final File f : files) {

src/test/java/org/apache/commons/csv/PerformanceTest.java

@@ -240,45 +240,25 @@ private static void testParser(final String msg, final CSVParserFactory fac) thr
         show();
     }
 
+    @FunctionalInterface
     private static interface CSVParserFactory {
         public CSVParser createParser() throws IOException;
     }
 
     private static void testParseCommonsCSV() throws Exception {
-        testParser("CSV", new CSVParserFactory() {
-            @Override
-            public CSVParser createParser() throws IOException {
-                return new CSVParser(createReader(), format);
-            }
-        });
+        testParser("CSV", () -> new CSVParser(createReader(), format));
     }
 
     private static void testParsePath() throws Exception {
-        testParser("CSV-PATH", new CSVParserFactory() {
-            @Override
-            public CSVParser createParser() throws IOException {
-                return CSVParser.parse(Files.newInputStream(Paths.get(BIG_FILE.toURI())), StandardCharsets.ISO_8859_1, format);
-            }
-        });
+        testParser("CSV-PATH", () -> CSVParser.parse(Files.newInputStream(Paths.get(BIG_FILE.toURI())), StandardCharsets.ISO_8859_1, format));
     }
 
     private static void testParsePathDoubleBuffering() throws Exception {
-        testParser("CSV-PATH-DB", new CSVParserFactory() {
-            @Override
-            public CSVParser createParser() throws IOException {
-                return CSVParser.parse(Files.newBufferedReader(Paths.get(BIG_FILE.toURI()), StandardCharsets.ISO_8859_1), format);
-            }
-        });
+        testParser("CSV-PATH-DB", () -> CSVParser.parse(Files.newBufferedReader(Paths.get(BIG_FILE.toURI()), StandardCharsets.ISO_8859_1), format));
     }
 
     private static void testParseURL() throws Exception {
-        testParser("CSV-URL", new CSVParserFactory() {
-            @Override
-            public CSVParser createParser() throws IOException {
-                //NOTE: URL will always return a BufferedInputStream.
-                return CSVParser.parse(BIG_FILE.toURI().toURL(), StandardCharsets.ISO_8859_1, format);
-            }
-        });
+        testParser("CSV-URL", () -> CSVParser.parse(BIG_FILE.toURI().toURL(), StandardCharsets.ISO_8859_1, format));
     }
 
     private static Constructor<Lexer> getLexerCtor(final String clazz) throws Exception {