Replaced the if-else statement by a single return statement.

Replaced use of Collection.size () by Collection.isEmpty () in ViddmeRipper.

src/main/java/com/rarchives/ripme/ripper/rippers/BatoRipper.java

@@ -57,10 +57,7 @@ public class BatoRipper extends AbstractHTMLRipper {
     public boolean pageContainsAlbums(URL url) {
         Pattern p = Pattern.compile("https?://bato.to/series/([\\d]+)/?");
         Matcher m = p.matcher(url.toExternalForm());
-        if (m.matches()) {
+        return m.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override
@@ -94,10 +91,7 @@ public class BatoRipper extends AbstractHTMLRipper {
 
         p = Pattern.compile("https?://bato.to/chapter/([\\d]+)/?");
         m = p.matcher(url.toExternalForm());
-        if (m.matches()) {
+        return m.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override

src/main/java/com/rarchives/ripme/ripper/rippers/NhentaiRipper.java

@@ -35,10 +35,7 @@ public class NhentaiRipper extends AbstractHTMLRipper {
     public boolean pageContainsAlbums(URL url) {
         Pattern pa = Pattern.compile("^https?://nhentai\\.net/tag/([a-zA-Z0-9_\\-]+)/?");
         Matcher ma = pa.matcher(url.toExternalForm());
-        if (ma.matches()) {
+        return ma.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override

src/main/java/com/rarchives/ripme/ripper/rippers/PichunterRipper.java

@@ -60,10 +60,7 @@ public class PichunterRipper extends AbstractHTMLRipper {
     private boolean isPhotoSet(URL url) {
         Pattern p = Pattern.compile("https?://www.pichunter.com/gallery/\\d+/(\\S*)/?");
         Matcher m = p.matcher(url.toExternalForm());
-        if (m.matches()) {
+        return m.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override

src/main/java/com/rarchives/ripme/ripper/rippers/Rule34Ripper.java

@@ -37,10 +37,7 @@ public class Rule34Ripper extends AbstractHTMLRipper {
     public boolean canRip(URL url){
         Pattern p = Pattern.compile("https?://rule34.xxx/index.php\\?page=post&s=list&tags=([\\S]+)");
         Matcher m = p.matcher(url.toExternalForm());
-        if (m.matches()) {
+        return m.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override

src/main/java/com/rarchives/ripme/ripper/rippers/WebtoonsRipper.java

@@ -38,10 +38,7 @@ public class WebtoonsRipper extends AbstractHTMLRipper {
     public boolean canRip(URL url) {
         Pattern pat = Pattern.compile("https?://www.webtoons.com/[a-zA-Z-_]+/[a-zA-Z_-]+/([a-zA-Z0-9_-]*)/[a-zA-Z0-9_-]+/\\S*");
         Matcher mat = pat.matcher(url.toExternalForm());
-        if (mat.matches()) {
+        return mat.matches();
-            return true;
-        }
-        return false;
     }
 
 

src/main/java/com/rarchives/ripme/ripper/rippers/XhamsterRipper.java

@@ -64,10 +64,7 @@ public class XhamsterRipper extends AbstractHTMLRipper {
     public boolean canRip(URL url) {
         Pattern p = Pattern.compile("^https?://[wmde.]*xhamster\\.com/photos/gallery/.*?(\\d+)$");
         Matcher m = p.matcher(url.toExternalForm());
-        if (m.matches()) {
+        return m.matches();
-            return true;
-        }
-        return false;
     }
 
     @Override

src/main/java/com/rarchives/ripme/ripper/rippers/video/ViddmeRipper.java

@@ -56,7 +56,7 @@ public class ViddmeRipper extends VideoRipper {
         logger.info("    Retrieving " + this.url.toExternalForm());
         Document doc = Http.url(this.url).get();
         Elements videos = doc.select("meta[name=twitter:player:stream]");
-        if (videos.size() == 0) {
+        if (videos.isEmpty()) {
             throw new IOException("Could not find twitter:player:stream at " + url);
         }
         String vidUrl = videos.first().attr("content");