BAEL-3597 Cactoos (#8512)

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

* BAEL-3597 Cactoos

libraries-3/pom.xml

@@ -23,10 +23,16 @@
             <artifactId>lombok</artifactId>
             <version>${lombok.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.cactoos</groupId>
+            <artifactId>cactoos</artifactId>
+            <version>${cactoos.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>
         <jcommander.version>1.78</jcommander.version>
         <lombok.version>1.18.6</lombok.version>
+        <cactoos.version>0.43</cactoos.version>
     </properties>
-</project>
+</project>

libraries-3/src/main/java/com/baeldung/cactoos/CactoosCollectionUtils.java

@@ -0,0 +1,28 @@
+package com.baeldung.cactoos;
+
+import java.util.Collection;
+import java.util.List;
+
+import org.cactoos.collection.Filtered;
+import org.cactoos.iterable.IterableOf;
+import org.cactoos.list.ListOf;
+import org.cactoos.scalar.And;
+import org.cactoos.text.FormattedText;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CactoosCollectionUtils {
+
+	final Logger LOGGER = LoggerFactory.getLogger(CactoosCollectionUtils.class);
+
+	public void iterateCollection(List<String> strings) throws Exception {
+		new And((String input) -> LOGGER.info(new FormattedText("%s\n", input).asString()), strings).value();
+	}
+
+	public Collection<String> getFilteredList(List<String> strings) {
+		Collection<String> filteredStrings = new ListOf<>(
+				new Filtered<>(string -> string.length() == 5, new IterableOf<>(strings)));
+		return filteredStrings;
+	}
+
+}

libraries-3/src/main/java/com/baeldung/cactoos/CactoosStringUtils.java

@@ -0,0 +1,37 @@
+package com.baeldung.cactoos;
+
+import java.io.IOException;
+
+import org.cactoos.text.FormattedText;
+import org.cactoos.text.IsBlank;
+import org.cactoos.text.Lowered;
+import org.cactoos.text.TextOf;
+import org.cactoos.text.Upper;
+
+public class CactoosStringUtils {
+
+	public String createString() throws IOException {
+		String testString = new TextOf("Test String").asString();
+		return testString;
+	}
+
+	public String createdFormattedString(String stringToFormat) throws IOException {
+		String formattedString = new FormattedText("Hello %s", stringToFormat).asString();
+		return formattedString;
+	}
+
+	public String toLowerCase(String testString) throws IOException {
+		String lowerCaseString = new Lowered(new TextOf(testString)).asString();
+		return lowerCaseString;
+	}
+
+	public String toUpperCase(String testString) throws Exception {
+		String upperCaseString = new Upper(new TextOf(testString)).asString();
+		return upperCaseString;
+	}
+
+	public boolean isBlank(String testString) throws Exception {
+		return new IsBlank(new TextOf(testString)) != null;
+	}
+
+}

libraries-3/src/test/java/com/baeldung/cactoos/CactoosCollectionUtilsUnitTest.java

@@ -0,0 +1,35 @@
+package com.baeldung.cactoos;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.ArrayList;
+
+import org.junit.Test;
+
+public class CactoosCollectionUtilsUnitTest {
+
+	@Test
+	public void whenFilteredClassIsCalledWithSpecificArgs_thenCorrespondingFilteredCollectionShouldBeReturned() throws IOException {
+
+		CactoosCollectionUtils obj = new CactoosCollectionUtils();
+
+		// when
+		List<String> strings = new ArrayList<String>() { 
+            { 
+                add("Hello"); 
+                add("John"); 
+                add("Smith"); 
+                add("Eric");
+                add("Dizzy");
+            } 
+        }; 
+		int size = obj.getFilteredList(strings).size();
+
+		// then
+		assertEquals(3, size);
+
+	}
+
+}

libraries-3/src/test/java/com/baeldung/cactoos/CactoosStringUtilsUnitTest.java

@@ -0,0 +1,54 @@
+package com.baeldung.cactoos;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.Test;
+
+public class CactoosStringUtilsUnitTest {
+
+	@Test
+	public void whenFormattedTextIsPassedWithArgs_thenFormattedStringIsReturned() throws IOException {
+
+		CactoosStringUtils obj = new CactoosStringUtils();
+
+		// when
+		String formattedString = obj.createdFormattedString("John");
+
+		// then
+		assertEquals("Hello John", formattedString);
+
+	}
+	
+	@Test
+	public void whenStringIsPassesdToLoweredOrUpperClass_thenCorrespondingStringIsReturned() throws Exception {
+
+		CactoosStringUtils obj = new CactoosStringUtils();
+
+		// when
+		String lowerCaseString = obj.toLowerCase("TeSt StrIng");
+		String upperCaseString = obj.toUpperCase("TeSt StrIng");
+
+		// then
+		assertEquals("test string", lowerCaseString);
+		assertEquals("TEST STRING", upperCaseString);
+
+	}
+	
+	@Test
+	public void whenEmptyStringIsPassesd_thenIsBlankReturnsTrue() throws Exception {
+
+		CactoosStringUtils obj = new CactoosStringUtils();
+
+		// when
+		boolean isBlankEmptyString = obj.isBlank("");
+		boolean isBlankNull = obj.isBlank(null);
+
+		// then
+		assertEquals(true, isBlankEmptyString);
+		assertEquals(true, isBlankNull);
+
+	}
+
+}