Reuse IOUtils.length(Object[]).

Author: Gary Gregory

src/main/java/org/apache/commons/io/FileUtils.java

@@ -2936,7 +2936,7 @@ public static File toFile(final URL url) {
      * @since 1.1
      */
     public static File[] toFiles(final URL... urls) {
-        if (urls == null || urls.length == 0) {
+        if (IOUtils.length(urls) == 0) {
             return EMPTY_FILE_ARRAY;
         }
         final File[] files = new File[urls.length];

src/main/java/org/apache/commons/io/file/StandardDeleteOption.java

@@ -17,6 +17,8 @@
 
 package org.apache.commons.io.file;
 
+import org.apache.commons.io.IOUtils;
+
 /**
  * Defines the standard delete options.
  *
@@ -38,7 +40,7 @@ public enum StandardDeleteOption implements DeleteOption {
      * @return true if the given options contain {@link StandardDeleteOption#OVERRIDE_READ_ONLY}.
      */
     public static boolean overrideReadOnly(final DeleteOption[] options) {
-        if (options == null || options.length == 0) {
+        if (IOUtils.length(options) == 0) {
             return false;
         }
         for (final DeleteOption deleteOption : options) {

src/main/java/org/apache/commons/io/filefilter/EmptyFileFilter.java

@@ -25,6 +25,8 @@
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.stream.Stream;
 
+import org.apache.commons.io.IOUtils;
+
 /**
  * This filter accepts files or directories that are empty.
  * <p>
@@ -101,7 +103,7 @@ protected EmptyFileFilter() {
     public boolean accept(final File file) {
         if (file.isDirectory()) {
             final File[] files = file.listFiles();
-            return files == null || files.length == 0;
+            return IOUtils.length(files) == 0;
         }
         return file.length() == 0;
     }