ExecuteAroundPattern

ankurpm · ankurpm · commit f196a823e2c1 · 2023-09-02T13:06:40.000-04:00
diff --git a/doubles.txt b/doubles.txt
@@ -0,0 +1,2 @@
+3.2
+4.2
diff --git a/src/main/java/Ch8_FunctionalProgramming/P168/Doubles.java b/src/main/java/Ch8_FunctionalProgramming/P168/Doubles.java
@@ -0,0 +1,32 @@
+package Ch8_FunctionalProgramming.P168;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class Doubles {
+
+    public double read(ScannerDoubleFunction scannerDoubleFunction) throws IOException {
+        try(Scanner scanner = new Scanner(Path.of("doubles.txt"), StandardCharsets.UTF_8)){
+            return scannerDoubleFunction.readDouble(scanner);
+        }
+    }
+
+    public double getFirst(Scanner scanner){
+        if(scanner.hasNextDouble()){
+            return scanner.nextDouble();
+        }
+        return Double.NaN;
+    }
+
+    public double sumAll(Scanner scanner){
+        double sum = 0.0d;
+        while(scanner.hasNextDouble()){
+            sum += scanner.nextDouble();
+        }
+        return sum;
+    }
+}
diff --git a/src/main/java/Ch8_FunctionalProgramming/P168/ScannerDoubleFunction.java b/src/main/java/Ch8_FunctionalProgramming/P168/ScannerDoubleFunction.java
@@ -0,0 +1,10 @@
+package Ch8_FunctionalProgramming.P168;
+
+import java.io.IOException;
+import java.util.Scanner;
+
+@FunctionalInterface
+public interface ScannerDoubleFunction {
+
+    double readDouble(Scanner scanner) throws IOException;
+}
diff --git a/src/test/java/Ch8_FunctionalProgramming/P166/FilterTest.java b/src/test/java/Ch8_FunctionalProgramming/P166/FilterTest.java
@@ -1,4 +1,4 @@
-package Ch8_FunctionalProgramming;
+package Ch8_FunctionalProgramming.P166;
 
 import Ch8_FunctionalProgramming.P166.Filter;
 import Ch8_FunctionalProgramming.P166.HeavyMelonPredicate;
diff --git a/src/test/java/Ch8_FunctionalProgramming/P168/ExecuteAroundPatternTest.java b/src/test/java/Ch8_FunctionalProgramming/P168/ExecuteAroundPatternTest.java
@@ -0,0 +1,30 @@
+package Ch8_FunctionalProgramming.P168;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.io.IOException;
+import java.util.Scanner;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@ExtendWith(MockitoExtension.class)
+public class ExecuteAroundPatternTest {
+
+    @InjectMocks
+    Doubles doubles;
+
+    @Test
+    void test_doublesGetFirst() throws IOException {
+        double result = doubles.read((Scanner sc)-> doubles.getFirst(sc));
+        assertEquals(3.2, result);
+    }
+
+    @Test
+    void test_doublesSumAll() throws IOException {
+        double result = doubles.read((Scanner sc)-> doubles.sumAll(sc));
+        assertEquals(7.4, result);
+    }
+}

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-package Ch8_FunctionalProgramming;`
	`1`	`+package Ch8_FunctionalProgramming.P166;`
`2`	`2`
`3`	`3`	`import Ch8_FunctionalProgramming.P166.Filter;`
`4`	`4`	`import Ch8_FunctionalProgramming.P166.HeavyMelonPredicate;`