Performance tweaks and changes to preconditions to fix #3

Author: cardil

src/main/java/pl/wavesoftware/eid/ReturnTypesAreNonnullByDefault.java

@@ -0,0 +1,17 @@
+package pl.wavesoftware.eid;
+
+import javax.annotation.Nonnull;
+import javax.annotation.meta.TypeQualifierDefault;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * @author Krzysztof Suszyński <krzysztof.suszynski@wavesoftware.pl>
+ * @since 2016-03-26
+ */
+@Nonnull
+@TypeQualifierDefault(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ReturnTypesAreNonnullByDefault {
+}