Control flow issues (#93)

* Control flow issues

Author: Mixpa

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

@@ -1615,10 +1615,7 @@ private static boolean isIPv6Address(final String inet6Address) {
             }
             validOctets++;
         }
-        if (validOctets > IPV6_MAX_HEX_GROUPS || (validOctets < IPV6_MAX_HEX_GROUPS && !containsCompressedZeroes)) {
-            return false;
-        }
-        return true;
+        return validOctets <= IPV6_MAX_HEX_GROUPS && (validOctets >= IPV6_MAX_HEX_GROUPS || containsCompressedZeroes);
     }
 
     private static final Pattern REG_NAME_PART_PATTERN = Pattern.compile("^[a-zA-Z0-9][a-zA-Z0-9-]*$");

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

@@ -778,11 +778,11 @@ public static boolean contentEqualsIgnoreEOL(final Reader input1, final Reader i
 
         String line1 = br1.readLine();
         String line2 = br2.readLine();
-        while (line1 != null && line2 != null && line1.equals(line2)) {
+        while (line1 != null && line1.equals(line2)) {
             line1 = br1.readLine();
             line2 = br2.readLine();
         }
-        return line1 == null ? line2 == null ? true : false : line1.equals(line2);
+        return Objects.equals(line1, line2);
     }
 
     /**

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

@@ -142,7 +142,7 @@ public AgeFileFilter(final File cutoffReference, final boolean acceptOlder) {
     @Override
     public boolean accept(final File file) {
         final boolean newer = FileUtils.isFileNewer(file, cutoff);
-        return acceptOlder ? !newer : newer;
+        return acceptOlder != newer;
     }
 
     /**

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

@@ -90,7 +90,7 @@ public SizeFileFilter(final long size, final boolean acceptLarger) {
     @Override
     public boolean accept(final File file) {
         final boolean smaller = file.length() < size;
-        return acceptLarger ? !smaller : smaller;
+        return acceptLarger != smaller;
     }
 
     /**