Annotate Filter interface with @NotNull

[rhynodge.git] / src / main / java / net / pterodactylus / rhynodge / filters / ExtractUrlFilter.java

diff --git a/src/main/java/net/pterodactylus/rhynodge/filters/ExtractUrlFilter.java b/src/main/java/net/pterodactylus/rhynodge/filters/ExtractUrlFilter.java
index b075686..78c589e 100644 (file)
--- a/src/main/java/net/pterodactylus/rhynodge/filters/ExtractUrlFilter.java
+++ b/src/main/java/net/pterodactylus/rhynodge/filters/ExtractUrlFilter.java
@@ -26,6 +26,7 @@ import net.pterodactylus.rhynodge.states.HtmlState;
 import net.pterodactylus.rhynodge.states.StringState;
 
 import com.google.common.base.Optional;
+import org.jetbrains.annotations.NotNull;
 import org.jsoup.nodes.Document;
 
 /**
@@ -35,8 +36,9 @@ import org.jsoup.nodes.Document;
  */
 public abstract class ExtractUrlFilter implements Filter {
 
+       @NotNull
        @Override
-       public State filter(State state) {
+       public State filter(@NotNull State state) {
                checkArgument(state instanceof HtmlState, "state must be an HTML state");
 
                HtmlState htmlState = (HtmlState) state;