Add options file_name_suffix and ignore_last_file

file_name_suffix: Only ingest files with given suffix
ignore_last_file: Do not ingest the last file

src/main/java/org/embulk/input/filename/FilenameFileInputPlugin.java

@@ -100,6 +100,10 @@ public class FilenameFileInputPlugin implements FileInputPlugin
         @Config("path_prefix")
         String getPathPrefix();
 
+        @Config("file_name_suffix")
+        @ConfigDefault("null")
+        Optional <String> getFileNameSuffix();
+
         @Config("last_path")
         @ConfigDefault("null")
         Optional<String> getLastPath();
@@ -112,6 +116,10 @@ public class FilenameFileInputPlugin implements FileInputPlugin
         @ConfigDefault("false")
         boolean getFollowSymlinks();
 
+        @Config("ignore_last_file")
+        @ConfigDefault("false")
+        boolean getIgnoreLastFile();
+
         List<String> getFiles();
         void setFiles(List<String> files);
 
@@ -188,6 +196,7 @@ public class FilenameFileInputPlugin implements FileInputPlugin
         final ImmutableList.Builder<String> builder = ImmutableList.builder();
         final String lastPath = task.getLastPath().orNull();
         final Integer fileSize = task.getFileSize().orNull();
+        final String fileNameSuffix = task.getFileNameSuffix().orNull();
         try {
             log.info("Listing local files at directory '{}' filtering filename by prefix '{}'", directory.equals(CURRENT_DIR) ? "." : directory.toString(), fileNamePrefix);
             Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
@@ -219,8 +228,10 @@ public class FilenameFileInputPlugin implements FileInputPlugin
                          return FileVisitResult.CONTINUE;
                     } else {
                         if (path.getFileName().toString().startsWith(fileNamePrefix)) {
-                            if (fileSize == null || path.toFile().length() == fileSize) { 
-                              builder.add(path.toString());
+                            if (fileNameSuffix == null || path.getFileName().toString().endsWith(fileNameSuffix)) {
+                                if (fileSize == null || path.toFile().length() == fileSize) {
+                                    builder.add(path.toString());
+                                }
                             }
                         }
                         return FileVisitResult.CONTINUE;
@@ -230,6 +241,7 @@ public class FilenameFileInputPlugin implements FileInputPlugin
         } catch (IOException ex) {
             throw new RuntimeException(String.format("Failed get a list of local files at '%s'", directory), ex);
         }
+        
         return builder.build();
     }