chore: adding missing method for retrieving patrons

Signed-off-by: Anthony D. Mays <anthony@morganlatimer.com>

Author: anthonydmays

lesson_16/api/api_app/src/main/java/com/codedifferently/lesson16/library/Library.java

@@ -124,13 +124,27 @@ public void removeLibraryGuest(LibraryGuest guest) throws MediaItemCheckedOutExc
     this.removeLibraryGuest(guest.getId());
   }
 
+  /**
+   * Returns all librarians registered for this library.
+   *
+   * @return A unique set of librarians.
+   */
   public Set<Librarian> getLibrarians() {
     return this.guestsById.values().stream()
         .filter(g -> g instanceof Librarian)
         .map(g -> (Librarian) g)
         .collect(Collectors.toSet());
   }
 
+  /**
+   * Returns all registered library patrons.
+   * 
+   * @return A unique set of all Library patrons.
+   */
+  public Set<LibraryGuest> getPatrons() {
+      return this.guestsById.values().stream().collect(Collectors.toSet());
+  }
+
   /**
    * Check out a item to a guest.
    *

lesson_16/api/api_app/src/test/java/com/codedifferently/lesson16/library/LibraryTest.java

@@ -5,6 +5,7 @@
 
 import com.codedifferently.lesson16.library.exceptions.MediaItemCheckedOutException;
 import java.util.List;
+import java.util.Set;
 import java.util.UUID;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -334,4 +335,19 @@ void testLibrary_preventsGuestFromCheckingOutNewspaper() {
     assertThat(wasCheckedOut).isFalse();
     assertThat(patron.getCheckedOutMediaItems().contains(newspaper)).isFalse();
   }
+
+  @Test
+  void testLibrary_retrievesAllPatrons() {
+    // Arrange
+    Patron patron1 = new Patron("John Doe", "john@example.com");
+    Patron patron2 = new Patron("Jane Doe", "jane@example.com");
+    classUnderTest.addLibraryGuest(patron1);
+    classUnderTest.addLibraryGuest(patron2);
+
+    // Act
+    Set<LibraryGuest> guests = classUnderTest.getPatrons();
+
+    // Assert
+    assertThat(classUnderTest.getPatrons().size()).isEqualTo(2);
+  }
 }

lib/java/codedifferently-instructional/instructional-lib/.classpath

@@ -15,5 +15,5 @@
 	</classpathentry>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17/"/>
 	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
-	<classpathentry kind="output" path="bin/default"/>
+	<classpathentry kind="output" path="bin"/>
 </classpath>