Support initial checked state

- In MenuView initial check state can be set.
- Relates #832

Author: jvalkeal

spring-shell-core/src/main/java/org/springframework/shell/component/view/control/MenuView.java

@@ -94,6 +94,14 @@ public void setItems(@Nullable List<MenuItem> items) {
 			if (!items.isEmpty()) {
 				activeItemIndex = 0;
 			}
+			items.forEach(i -> {
+				if (i.initialCheckState && i.getCheckStyle() == MenuItemCheckStyle.CHECKED) {
+					checkedActive.add(i);
+				}
+				else if (i.initialCheckState && i.getCheckStyle() == MenuItemCheckStyle.RADIO) {
+					radioActive = i;
+				}
+			});
 		}
 	}
 
@@ -321,6 +329,7 @@ public static class MenuItem  {
 		private final MenuItemCheckStyle checkStyle;
 		private final List<MenuItem> items;
 		private Runnable action;
+		private boolean initialCheckState = false;
 
 		/**
 		 * Construct menu item with a title.
@@ -342,19 +351,33 @@ public MenuItem(String title, MenuItemCheckStyle checkStyle) {
 		}
 
 		/**
-		 * Construct menu item with a title and a check style.
+		 * Construct menu item with a title, a check style and a runnable.
 		 *
 		 * @param title the title
 		 * @param checkStyle the check style
 		 * @param action the action to run when item is chosen
 		 */
 		public MenuItem(String title, MenuItemCheckStyle checkStyle, Runnable action) {
+			this(title, checkStyle, action, false);
+		}
+
+		/**
+		 * Construct menu item with a title, a check style, a runnable and initial
+		 * checked state.
+		 *
+		 * @param title the title
+		 * @param checkStyle the check style
+		 * @param action the action to run when item is chosen
+		 * @param initialCheckState initial checked state
+		 */
+		public MenuItem(String title, MenuItemCheckStyle checkStyle, Runnable action, boolean initialCheckState) {
 			Assert.state(StringUtils.hasText(title), "title must have text");
 			Assert.notNull(checkStyle, "check style cannot be null");
 			this.title = title;
 			this.checkStyle = checkStyle;
 			this.action = action;
 			this.items = null;
+			this.initialCheckState = initialCheckState;
 		}
 
 		protected MenuItem(String title, MenuItem[] items) {
@@ -395,6 +418,10 @@ public static MenuItem of(String title, MenuItemCheckStyle checkStyle, Runnable
 			return new MenuItem(title, checkStyle, action);
 		}
 
+		public static MenuItem of(String title, MenuItemCheckStyle checkStyle, Runnable action, boolean initialCheckState) {
+			return new MenuItem(title, checkStyle, action, initialCheckState);
+		}
+
 		public Runnable getAction() {
 			return action;
 		}
@@ -403,6 +430,15 @@ public void setAction(Runnable action) {
 			this.action = action;
 		}
 
+		/**
+		 * Gets initial check state.
+		 *
+		 * @return initial check state
+		 */
+		public boolean isInitialCheckState() {
+			return initialCheckState;
+		}
+
 		/**
 		 * Get a {@code title}. Never null, empty or just having white spaces.
 		 *

spring-shell-core/src/test/java/org/springframework/shell/component/view/control/MenuViewTests.java

@@ -17,6 +17,7 @@
 
 import java.time.Duration;
 import java.util.Arrays;
+import java.util.Set;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Nested;
@@ -38,10 +39,13 @@
 class MenuViewTests extends AbstractViewTests {
 
 	private static final String SELECTED_FIELD = "activeItemIndex";
+	private static final String RADIO_ACTIVE_FIELD = "radioActive";
+	private static final String CHECKED_ACTIVE_FIELD = "checkedActive";
 
 	@Nested
 	class Construction {
 
+		@SuppressWarnings("unchecked")
 		@Test
 		void constructView() {
 			MenuView view;
@@ -69,6 +73,42 @@ void constructView() {
 				new MenuItem("sub2", MenuItemCheckStyle.RADIO)
 			});
 			assertThat(view.getItems()).hasSize(2);
+
+			view = new MenuView(new MenuItem[] {
+				new MenuItem("sub1", MenuItemCheckStyle.RADIO, null, true),
+				new MenuItem("sub2", MenuItemCheckStyle.RADIO, null, false)
+			});
+			assertThat(view.getItems()).hasSize(2);
+			MenuItem radioActive = (MenuItem) ReflectionTestUtils.getField(view, RADIO_ACTIVE_FIELD);
+			assertThat(radioActive).isNotNull();
+			assertThat(radioActive.getTitle()).isEqualTo("sub1");
+
+			view = new MenuView(new MenuItem[] {
+				new MenuItem("sub1", MenuItemCheckStyle.CHECKED, null, true),
+				new MenuItem("sub2", MenuItemCheckStyle.CHECKED, null, true)
+			});
+			assertThat(view.getItems()).hasSize(2);
+			Set<MenuItem> checkedActive = (Set<MenuItem>) ReflectionTestUtils.getField(view, CHECKED_ACTIVE_FIELD);
+			assertThat(checkedActive).isNotNull();
+			assertThat(checkedActive).hasSize(2);
+		}
+
+		@Test
+		void constructItem() {
+			MenuItem item;
+			Runnable runnable = () -> {};
+
+			item = new MenuItem("title", MenuItemCheckStyle.RADIO, runnable, true);
+			assertThat(item.getTitle()).isEqualTo("title");
+			assertThat(item.getCheckStyle()).isEqualTo(MenuItemCheckStyle.RADIO);
+			assertThat(item.getAction()).isSameAs(runnable);
+			assertThat(item.isInitialCheckState()).isTrue();
+
+			item = MenuItem.of("title", MenuItemCheckStyle.RADIO, runnable, true);
+			assertThat(item.getTitle()).isEqualTo("title");
+			assertThat(item.getCheckStyle()).isEqualTo(MenuItemCheckStyle.RADIO);
+			assertThat(item.getAction()).isSameAs(runnable);
+			assertThat(item.isInitialCheckState()).isTrue();
 		}
 
 		@Test