diff --git a/DesignPatterns/src/main/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessor.java b/DesignPatterns/src/main/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessor.java
index 6a2708c..b5e40d8 100644
--- a/DesignPatterns/src/main/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessor.java
+++ b/DesignPatterns/src/main/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessor.java
@@ -1,17 +1,18 @@
 package pl.mperor.lab.java.design.pattern.structural.decorator.lambda.expression;
 
 import java.util.Arrays;
-import java.util.function.UnaryOperator;
 
 @FunctionalInterface
-public interface TextProcessor extends UnaryOperator<String> {
+public interface TextProcessor {
+
+    String process(String text);
 
     default TextProcessor chain(TextProcessor after) {
-        return input -> after.apply(this.apply(input));
+        return input -> after.process(this.process(input));
     }
 
     static TextProcessor identity() {
-        return s -> s;
+        return text -> text;
     }
 
     static TextProcessor of(TextProcessor processor) {
diff --git a/DesignPatterns/src/test/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessorAndValidatorTest.java b/DesignPatterns/src/test/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessorAndValidatorTest.java
index 03f4438..4501485 100644
--- a/DesignPatterns/src/test/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessorAndValidatorTest.java
+++ b/DesignPatterns/src/test/java/pl/mperor/lab/java/design/pattern/structural/decorator/lambda/expression/TextProcessorAndValidatorTest.java
@@ -11,7 +11,7 @@ public void shouldAllowToCreateTextProcessorAsChainOfFunctions() {
                 TextProcessor.of(String::strip)
                         .chain(s -> "prefix" + s)
                         .chain(s -> s + "suffix")
-                        .apply("  @Hello World@")
+                        .process("  @Hello World@")
         );
 
         Assertions.assertEquals("HEX",
@@ -19,7 +19,7 @@ public void shouldAllowToCreateTextProcessorAsChainOfFunctions() {
                         String::toUpperCase,
                         s -> s.replace("L", "X"),
                         s -> s.substring(0, 3)
-                ).apply("Hello World")
+                ).process("Hello World")
         );
     }