Annotating suggestions methods with nullable annotations

app/src/main/java/acr/browser/lightning/search/BaseSuggestionsTask.java

@@ -44,10 +44,12 @@ abstract class BaseSuggestionsTask {
     @NonNull private final CacheControl mCacheControl;
     @NonNull private String mQuery;
 
+    @NonNull
     protected abstract String getQueryUrl(@NonNull String query, @NonNull String language);
 
-    protected abstract void parseResults(FileInputStream inputStream, List<HistoryItem> results) throws Exception;
+    protected abstract void parseResults(@NonNull FileInputStream inputStream, @NonNull List<HistoryItem> results) throws Exception;
 
+    @NonNull
     protected abstract String getEncoding();
 
     BaseSuggestionsTask(@NonNull String query,

app/src/main/java/acr/browser/lightning/search/DuckSuggestionsTask.java

@@ -25,13 +25,14 @@ final class DuckSuggestionsTask extends BaseSuggestionsTask {
         mSearchSubtitle = application.getString(R.string.suggestion);
     }
 
+    @NonNull
     @Override
     protected String getQueryUrl(@NonNull String query, @NonNull String language) {
         return "https://duckduckgo.com/ac/?q=" + query;
     }
 
     @Override
-    protected void parseResults(FileInputStream inputStream, List<HistoryItem> results) throws Exception {
+    protected void parseResults(@NonNull FileInputStream inputStream, @NonNull List<HistoryItem> results) throws Exception {
         String content = FileUtils.readStringFromFile(inputStream, ENCODING);
         JSONArray jsonArray = new JSONArray(content);
         int counter = 0;
@@ -47,6 +48,7 @@ final class DuckSuggestionsTask extends BaseSuggestionsTask {
         }
     }
 
+    @NonNull
     @Override
     protected String getEncoding() {
         return ENCODING;

app/src/main/java/acr/browser/lightning/search/GoogleSuggestionsTask.java

@@ -35,7 +35,7 @@ class GoogleSuggestionsTask extends BaseSuggestionsTask {
     }
 
     @Override
-    protected void parseResults(FileInputStream inputStream, List<HistoryItem> results) throws Exception {
+    protected void parseResults(@NonNull FileInputStream inputStream, @NonNull List<HistoryItem> results) throws Exception {
         BufferedInputStream fileInput = new BufferedInputStream(inputStream);
         XmlPullParser parser = getParser();
         parser.setInput(fileInput, ENCODING);
@@ -55,6 +55,7 @@ class GoogleSuggestionsTask extends BaseSuggestionsTask {
         }
     }
 
+    @NonNull
     @Override
     protected String getEncoding() {
         return ENCODING;