Replaced use of Collection.size () by Collection.isEmpty () which makes the code more readable and may have more performance

src/main/java/com/rarchives/ripme/App.java

@@ -330,7 +330,7 @@ public class App {
         } else {
             logger.info("Loading history from configuration");
             HISTORY.fromList(Utils.getConfigList("download.history"));
-            if (HISTORY.toList().size() == 0) {
+            if (HISTORY.toList().isEmpty()) {
                 // Loaded from config, still no entries.
                 // Guess rip history based on rip folder
                 String[] dirs = Utils.getWorkingDirectory().list((dir, file) -> new File(dir.getAbsolutePath() + File.separator + file).isDirectory());

src/main/java/com/rarchives/ripme/ripper/AbstractHTMLRipper.java

@@ -111,7 +111,7 @@ public abstract class AbstractHTMLRipper extends AlbumRipper {
                     }
                 }
 
-                if (imageURLs.size() == 0) {
+                if (imageURLs.isEmpty()) {
                     throw new IOException("No images found at " + doc.location());
                 }
 
@@ -127,7 +127,7 @@ public abstract class AbstractHTMLRipper extends AlbumRipper {
             if (hasDescriptionSupport() && Utils.getConfigBoolean("descriptions.save", false)) {
                 logger.debug("Fetching description(s) from " + doc.location());
                 List<String> textURLs = getDescriptionsFromPage(doc);
-                if (textURLs.size() > 0) {
+                if (!textURLs.isEmpty()) {
                     logger.debug("Found description link(s) from " + doc.location());
                     for (String textURL : textURLs) {
                         if (isStopped()) {

src/main/java/com/rarchives/ripme/ripper/AbstractJSONRipper.java

@@ -63,7 +63,7 @@ public abstract class AbstractJSONRipper extends AlbumRipper {
                 }
             }
 
-            if (imageURLs.size() == 0) {
+            if (imageURLs.isEmpty()) {
                 throw new IOException("No images found at " + this.url);
             }
 

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

@@ -56,7 +56,7 @@ public class BcfakesRipper extends AbstractHTMLRipper {
     public Document getNextPage(Document doc) throws IOException {
         // Find next page
         Elements hrefs = doc.select("a.next");
-        if (hrefs.size() == 0) {
+        if (hrefs.isEmpty()) {
             throw new IOException("No more pages");
         }
         String nextUrl = "http://www.bcfakes.com" + hrefs.first().attr("href");

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

@@ -241,8 +241,8 @@ public class DeviantartRipper extends AbstractHTMLRipper {
             return null;
         }
         Elements nextButtons = page.select("link[rel=\"next\"]");
-        if (nextButtons.size() == 0) {
-            if (page.select("link[rel=\"prev\"]").size() == 0) {
+        if (nextButtons.isEmpty()) {
+            if (page.select("link[rel=\"prev\"]").isEmpty()) {
                 throw new IOException("No next page found");
             } else {
                 throw new IOException("Hit end of pages");
@@ -376,7 +376,7 @@ public class DeviantartRipper extends AbstractHTMLRipper {
             Elements els = doc.select("img.dev-content-full");
             String fsimage = null;
             // Get the largest resolution image on the page
-            if (els.size() > 0) {
+            if (!els.isEmpty()) {
                 // Large image
                 fsimage = els.get(0).attr("src");
                 logger.info("Found large-scale: " + fsimage);
@@ -386,7 +386,7 @@ public class DeviantartRipper extends AbstractHTMLRipper {
             }
             // Try to find the download button
             els = doc.select("a.dev-page-download");
-            if (els.size() > 0) {
+            if (!els.isEmpty()) {
                 // Full-size image
                 String downloadLink = els.get(0).attr("href");
                 logger.info("Found download button link: " + downloadLink);

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

@@ -60,7 +60,7 @@ public class DrawcrowdRipper extends AbstractHTMLRipper {
     @Override
     public Document getNextPage(Document doc) throws IOException {
         Elements loadMore = doc.select("a#load-more");
-        if (loadMore.size() == 0) {
+        if (loadMore.isEmpty()) {
             throw new IOException("No next page found");
         }
         if (!sleep(1000)) {

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

@@ -49,7 +49,7 @@ public class DribbbleRipper extends AbstractHTMLRipper {
     public Document getNextPage(Document doc) throws IOException {
         // Find next page
         Elements hrefs = doc.select("a.next_page");
-        if (hrefs.size() == 0) {
+        if (hrefs.isEmpty()) {
             throw new IOException("No more pages");
         }
         String nextUrl = "https://www.dribbble.com" + hrefs.first().attr("href");

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

@@ -186,7 +186,7 @@ public class EHentaiRipper extends AbstractHTMLRipper {
         }
         // Find next page
         Elements hrefs = doc.select(".ptt a");
-        if (hrefs.size() == 0) {
+        if (hrefs.isEmpty()) {
             logger.info("doc: " + doc.html());
             throw new IOException("No navigation links found");
         }
@@ -255,10 +255,10 @@ public class EHentaiRipper extends AbstractHTMLRipper {
 
                 // Find image
                 Elements images = doc.select(".sni > a > img");
-                if (images.size() == 0) {
+                if (images.isEmpty()) {
                     // Attempt to find image elsewise (Issue #41)
                     images = doc.select("img#img");
-                    if (images.size() == 0) {
+                    if (images.isEmpty()) {
                         logger.warn("Image not found at " + this.url);
                         return;
                     }

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

@@ -276,7 +276,7 @@ public class FivehundredpxRipper extends AbstractJSONRipper {
             catch (IOException e) {
                 logger.error("Error fetching full-size image from " + rawUrl, e);
             }
-            if (images.size() > 0) {
+            if (!images.isEmpty()) {
                 imageURL = images.first().attr("src");
                 logger.debug("Found full-size non-watermarked image: " + imageURL);
             }

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

@@ -250,7 +250,7 @@ public class FlickrRipper extends AbstractHTMLRipper {
             try {
                 Document doc = getLargestImagePageDocument(this.url);
                 Elements fullsizeImages = doc.select("div#allsizes-photo img");
-                if (fullsizeImages.size() == 0) {
+                if (fullsizeImages.isEmpty()) {
                     logger.error("Could not find flickr image at " + doc.location() + " - missing 'div#allsizes-photo img'");
                 }
                 else {
@@ -274,7 +274,7 @@ public class FlickrRipper extends AbstractHTMLRipper {
             String largestImagePage = this.url.toExternalForm();
             for (Element olSize : doc.select("ol.sizes-list > li > ol > li")) {
                 Elements ola = olSize.select("a");
-                if (ola.size() == 0) {
+                if (ola.isEmpty()) {
                     largestImagePage = this.url.toExternalForm();
                 }
                 else {

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

@@ -68,7 +68,7 @@ public class FuraffinityRipper extends AbstractHTMLRipper {
     public Document getNextPage(Document doc) throws IOException {
         // Find next page
         Elements nextPageUrl = doc.select("a.right");
-        if (nextPageUrl.size() == 0) {
+        if (nextPageUrl.isEmpty()) {
             throw new IOException("No more pages");
         }
         String nextUrl = urlBase + nextPageUrl.first().attr("href");
@@ -121,7 +121,7 @@ public class FuraffinityRipper extends AbstractHTMLRipper {
 
             // Try to find the description
             Elements els = resp.parse().select("td[class=alt1][width=\"70%\"]");
-            if (els.size() == 0) {
+            if (els.isEmpty()) {
                 logger.debug("No description at " + page);
                 throw new IOException("No description found");
             }

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

@@ -111,7 +111,7 @@ public class HentaifoundryRipper extends AbstractHTMLRipper {
 
     @Override
     public Document getNextPage(Document doc) throws IOException {
-        if (doc.select("li.next.hidden").size() != 0) {
+        if (!doc.select("li.next.hidden").isEmpty()) {
             // Last page
             throw new IOException("No more pages");
         }

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

@@ -101,7 +101,7 @@ public class ImagevenueRipper extends AbstractHTMLRipper {
                                    .get();
                 // Find image
                 Elements images = doc.select("a > img");
-                if (images.size() == 0) {
+                if (images.isEmpty()) {
                     logger.warn("Image not found at " + this.url);
                     return;
                 }

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

@@ -304,10 +304,10 @@ public class ImgurRipper extends AlbumRipper {
         ImgurAlbum imgurAlbum = new ImgurAlbum(url);
         for (Element thumb : doc.select("div.image")) {
             String image;
-            if (thumb.select("a.zoom").size() > 0) {
+            if (!thumb.select("a.zoom").isEmpty()) {
                 // Clickably full-size
                 image = "http:" + thumb.select("a").attr("href");
-            } else if (thumb.select("img").size() > 0) {
+            } else if (!thumb.select("img").isEmpty()) {
                 image = "http:" + thumb.select("img").attr("src");
             } else {
                 // Unable to find image in this div
@@ -449,7 +449,7 @@ public class ImgurRipper extends AlbumRipper {
                 URL imageURL = new URL(image);
                 addURLToDownload(imageURL);
             }
-            if (imgs.size() == 0) {
+            if (imgs.isEmpty()) {
                 break;
             }
             page++;

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

@@ -287,7 +287,7 @@ public class InstagramRipper extends AbstractJSONRipper {
                 }
                 try {
                     if (!data.getBoolean("is_video")) {
-                        if (imageURLs.size() == 0) {
+                        if (imageURLs.isEmpty()) {
                             // We add this one item to the array because either wise
                             // the ripper will error out because we returned an empty array
                             imageURLs.add(getOriginalUrl(data.getString("display_url")));

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

@@ -78,7 +78,7 @@ public class NfsfwRipper extends AlbumRipper {
         List<Pair> subAlbums = new ArrayList<>();
         int index = 0;
         subAlbums.add(new Pair(this.url.toExternalForm(), ""));
-        while (subAlbums.size() > 0) {
+        while (!subAlbums.isEmpty()) {
             if (isStopped()) {
                 break;
             }
@@ -167,7 +167,7 @@ public class NfsfwRipper extends AlbumRipper {
                                    .referrer(this.url)
                                    .get();
                 Elements images = doc.select(".gbBlock img");
-                if (images.size() == 0) {
+                if (images.isEmpty()) {
                     logger.error("Failed to find image at " + this.url);
                     return;
                 }

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

@@ -54,7 +54,7 @@ public class PhotobucketRipper extends AlbumRipper {
             }
             Document albumDoc = pageResponse.parse();
             Elements els = albumDoc.select("div.libraryTitle > h1");
-            if (els.size() == 0) {
+            if (els.isEmpty()) {
                 throw new IOException("Could not find libraryTitle at " + url);
             }
             return els.get(0).text();
@@ -92,7 +92,7 @@ public class PhotobucketRipper extends AlbumRipper {
             subsToRip.add(sub);
         }
 
-        while (subsToRip.size() > 0 && !isStopped()) {
+        while (!subsToRip.isEmpty() && !isStopped()) {
             try {
                 Thread.sleep(1000);
             } catch (InterruptedException e) {

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

@@ -91,7 +91,7 @@ public class PornhubRipper extends AlbumRipper {
 
         // Find thumbnails
         Elements thumbs = albumDoc.select(".photoBlockBox li");
-        if (thumbs.size() == 0) {
+        if (thumbs.isEmpty()) {
             logger.debug("albumDoc: " + albumDoc);
             logger.debug("No images found at " + nextUrl);
             return;

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

@@ -228,7 +228,7 @@ public class TwitterRipper extends AlbumRipper {
         int parsedCount = 0;
         for (int i = 0; i < MAX_REQUESTS; i++) {
             List<JSONObject> tweets = getTweets(getApiURL(lastMaxID - 1));
-            if (tweets.size() == 0) {
+            if (tweets.isEmpty()) {
                 logger.info("   No more tweets found.");
                 break;
             }

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

@@ -82,7 +82,7 @@ public class TwodgalleriesRipper extends AbstractHTMLRipper {
         Document nextDoc = Http.url(url)
                                .cookies(cookies)
                                .get();
-        if (nextDoc.select("div.hcaption > img").size() == 0) {
+        if (nextDoc.select("div.hcaption > img").isEmpty()) {
             throw new IOException("No more images to retrieve");
         }
         return nextDoc;

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

@@ -72,7 +72,7 @@ public class GfycatRipper extends VideoRipper {
         
         Document doc = Http.url(url).get();
         Elements videos = doc.select("source#mp4Source");
-        if (videos.size() == 0) {
+        if (videos.isEmpty()) {
             throw new IOException("Could not find source#mp4source at " + url);
         }
         String vidUrl = videos.first().attr("src");

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

@@ -58,7 +58,7 @@ public class MotherlessVideoRipper extends VideoRipper {
             logger.error("WTF");
         }
         List<String> vidUrls = Utils.between(html, "__fileurl = '", "';");
-        if (vidUrls.size() == 0) {
+        if (vidUrls.isEmpty()) {
             throw new IOException("Could not find video URL at " + url);
         }
         String vidUrl = vidUrls.get(0);

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

@@ -62,7 +62,7 @@ public class TwitchVideoRipper extends VideoRipper {
         String title = doc.title();
         
         Elements script = doc.select("script");
-        if (script.size() == 0) {
+        if (script.isEmpty()) {
             throw new IOException("Could not find script code at " + url);
         }
         //Regex assumes highest quality source is listed first

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

@@ -57,7 +57,7 @@ public class VidearnRipper extends VideoRipper {
         logger.info("Retrieving " + this.url);
         Document doc = Http.url(url).get();
         List<String> mp4s = Utils.between(doc.html(), "file:\"", "\"");
-        if (mp4s.size() == 0) {
+        if (mp4s.isEmpty()) {
             throw new IOException("Could not find files at " + url);
         }
         String vidUrl = mp4s.get(0);

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

@@ -57,7 +57,7 @@ public class VineRipper extends VideoRipper {
         logger.info("    Retrieving " + this.url.toExternalForm());
         Document doc = Http.url(this.url).get();
         Elements props = doc.select("meta[property=twitter:player:stream]");
-        if (props.size() == 0) {
+        if (props.isEmpty()) {
             throw new IOException("Could not find meta property 'twitter:player:stream' at " + url);
         }
         String vidUrl = props.get(0).attr("content");

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

@@ -57,7 +57,7 @@ public class XhamsterRipper extends VideoRipper {
         logger.info("Retrieving " + this.url);
         Document doc = Http.url(url).get();
         Elements videos = doc.select("div.player-container > a");
-        if (videos.size() == 0) {
+        if (videos.isEmpty()) {
             throw new IOException("Could not find Embed code at " + url);
         }
         String vidUrl = videos.attr("href");

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

@@ -57,7 +57,7 @@ public class YoupornRipper extends VideoRipper {
         logger.info("    Retrieving " + this.url);
         Document doc = Http.url(this.url).get();
         Elements videos = doc.select("video");
-        if (videos.size() == 0) {
+        if (videos.isEmpty()) {
             throw new IOException("Could not find Embed code at " + url);
         }
         Element video = videos.get(0);

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

@@ -65,7 +65,7 @@ public class YuvutuRipper extends VideoRipper {
             throw new IOException("Could not find iframe code at " + url);
         }
         Elements script = doc.select("script");
-        if (script.size() == 0) {
+        if (script.isEmpty()) {
             throw new IOException("Could not find script code at " + url);
         }
         Pattern p = Pattern.compile("file: \"(.*?)\"");

src/main/java/com/rarchives/ripme/ui/MainWindow.java

@@ -987,7 +987,7 @@ public final class MainWindow implements Runnable, RipStatusHandler {
         } else {
             logger.info(rb.getString("loading.history.from.configuration"));
             HISTORY.fromList(Utils.getConfigList("download.history"));
-            if (HISTORY.toList().size() == 0) {
+            if (HISTORY.toList().isEmpty()) {
                 // Loaded from config, still no entries.
                 // Guess rip history based on rip folder
                 String[] dirs = Utils.getWorkingDirectory().list((dir, file) -> new File(dir.getAbsolutePath() + File.separator + file).isDirectory());