Add function to extract the context of a context object.

diff --git a/src/main/java/net/pterodactylus/sone/freenet/wot/Context.java b/src/main/java/net/pterodactylus/sone/freenet/wot/Context.java
index 0f730fa..f72e56d 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/freenet/wot/Context.java
+++ b/src/main/java/net/pterodactylus/sone/freenet/wot/Context.java
@@ -17,6 +17,10 @@
 
 package net.pterodactylus.sone.freenet.wot;
 
+import javax.annotation.Nullable;
+
+import com.google.common.base.Function;
+
 /**
  * Custom container for the Web of Trust context. This allows easier
  * configuration of dependency injection.
@@ -25,6 +29,14 @@ package net.pterodactylus.sone.freenet.wot;
  */
 public class Context {
 
+       public static final Function<Context, String> extractContext = new Function<Context, String>() {
+               @Nullable
+               @Override
+               public String apply(@Nullable Context context) {
+                       return (context == null) ? null : context.getContext();
+               }
+       };
+
        private final String context;
 
        public Context(String context) {