feat: adding required on number input

spring-shell-core/src/main/java/org/springframework/shell/component/NumberInput.java

@@ -44,6 +44,7 @@ public class NumberInput extends AbstractTextComponent<Number, NumberInputContex
 	private static final Logger log = LoggerFactory.getLogger(NumberInput.class);
 	private final Number defaultValue;
 	private Class<? extends Number> clazz;
+	private boolean required;
 	private NumberInputContext currentContext;
 
 	public NumberInput(Terminal terminal) {
@@ -55,32 +56,41 @@ public NumberInput(Terminal terminal, String name) {
 	}
 
 	public NumberInput(Terminal terminal, String name, Number defaultValue) {
-		this(terminal, name, defaultValue, Integer.class, null);
+		this(terminal, name, defaultValue, Integer.class);
 	}
 
 	public NumberInput(Terminal terminal, String name, Number defaultValue, Class<? extends Number> clazz) {
-		this(terminal, name, defaultValue, clazz, null);
+		this(terminal, name, defaultValue, clazz, false);
 	}
 
-	public NumberInput(Terminal terminal, String name, Number defaultValue, Class<? extends Number> clazz,
+	public NumberInput(Terminal terminal, String name, Number defaultValue, Class<? extends Number> clazz, boolean required) {
+		this(terminal, name, defaultValue, clazz, required, null);
+	}
+
+	public NumberInput(Terminal terminal, String name, Number defaultValue, Class<? extends Number> clazz, boolean required,
 			Function<NumberInputContext, List<AttributedString>> renderer) {
 		super(terminal, name, null);
 		setRenderer(renderer != null ? renderer : new DefaultRenderer());
 		setTemplateLocation("classpath:org/springframework/shell/component/number-input-default.stg");
 		this.defaultValue = defaultValue;
 		this.clazz = clazz;
+		this.required = required;
 	}
 
 	public void setNumberClass(Class<? extends Number>  clazz) {
 		this.clazz = clazz;
 	}
 
+	public void setRequired(boolean required) {
+		this.required = required;
+	}
+
 	@Override
 	public NumberInputContext getThisContext(ComponentContext<?> context) {
 		if (context != null && currentContext == context) {
 			return currentContext;
 		}
-		currentContext = NumberInputContext.of(defaultValue, clazz);
+		currentContext = NumberInputContext.of(defaultValue, clazz, required);
 		currentContext.setName(getName());
 		Optional.ofNullable(context).map(ComponentContext::stream)
 				.ifPresent(entryStream -> entryStream.forEach(e -> currentContext.put(e.getKey(), e.getValue())));
@@ -121,6 +131,9 @@ protected boolean read(BindingReader bindingReader, KeyMap<String> keyMap, Numbe
 				}
 				else if (context.getDefaultValue() != null) {
 					context.setResultValue(context.getDefaultValue());
+				} else if (required) {
+					context.setMessage("This field is mandatory", TextComponentContext.MessageLevel.ERROR);
+					break;
 				}
 				return true;
 			default:
@@ -186,6 +199,20 @@ public interface NumberInputContext extends TextComponentContext<Number, NumberI
 		 */
 		void setDefaultClass(Class<? extends Number> defaultClass);
 
+		/**
+		 * Sets flag for mandatory input.
+		 *
+		 * @param required true if input is required
+		 */
+		void setRequired(boolean required);
+
+		/**
+		 * Returns flag if input is required.
+		 *
+		 * @return true if input is required, false otherwise
+		 */
+		boolean isRequired();
+
 		/**
 		 * Gets an empty {@link NumberInputContext}.
 		 *
@@ -201,7 +228,7 @@ public static NumberInputContext empty() {
 		 * @return number input context
 		 */
 		public static NumberInputContext of(Number defaultValue) {
-			return new DefaultNumberInputContext(defaultValue, Integer.class);
+			return new DefaultNumberInputContext(defaultValue, Integer.class, false);
 		}
 
 		/**
@@ -210,18 +237,29 @@ public static NumberInputContext of(Number defaultValue) {
 		 * @return number input context
 		 */
 		public static NumberInputContext of(Number defaultValue, Class<? extends Number> defaultClass) {
-			return new DefaultNumberInputContext(defaultValue, defaultClass);
+			return new DefaultNumberInputContext(defaultValue, defaultClass, false);
+		}
+
+		/**
+		 * Gets an {@link NumberInputContext}.
+		 *
+		 * @return number input context
+		 */
+		public static NumberInputContext of(Number defaultValue, Class<? extends Number> defaultClass, boolean required) {
+			return new DefaultNumberInputContext(defaultValue, defaultClass, required);
 		}
 	}
 
 	private static class DefaultNumberInputContext extends BaseTextComponentContext<Number, NumberInputContext> implements NumberInputContext {
 
 		private Number defaultValue;
 		private Class<? extends Number> defaultClass;
+		private boolean required;
 
-		public DefaultNumberInputContext(Number defaultValue, Class<? extends Number> defaultClass) {
+		public DefaultNumberInputContext(Number defaultValue, Class<? extends Number> defaultClass, boolean required) {
 			this.defaultValue = defaultValue;
 			this.defaultClass = defaultClass;
+			this.required = required;
 		}
 
 		@Override
@@ -244,11 +282,22 @@ public void setDefaultClass(Class<? extends Number> defaultClass) {
 			this.defaultClass = defaultClass;
 		}
 
+		@Override
+		public void setRequired(boolean required) {
+			this.required = required;
+		}
+
+		@Override
+		public boolean isRequired() {
+			return required;
+		}
+
 		@Override
 		public Map<String, Object> toTemplateModel() {
 			Map<String, Object> attributes = super.toTemplateModel();
 			attributes.put("defaultValue", getDefaultValue() != null ? getDefaultValue() : null);
 			attributes.put("defaultClass", getDefaultClass().getSimpleName());
+			attributes.put("required", isRequired());
 			Map<String, Object> model = new HashMap<>();
 			model.put("model", attributes);
 			return model;

spring-shell-core/src/main/java/org/springframework/shell/component/flow/BaseNumberInput.java

@@ -37,6 +37,7 @@ public abstract class BaseNumberInput extends BaseInput<NumberInputSpec> impleme
 	private ResultMode resultMode;
 	private Number defaultValue;
 	private Class<? extends Number> clazz = Integer.class;
+	private boolean required = false;
 	private Function<NumberInputContext, List<AttributedString>> renderer;
 	private final List<Consumer<NumberInputContext>> preHandlers = new ArrayList<>();
 	private final List<Consumer<NumberInputContext>> postHandlers = new ArrayList<>();
@@ -78,6 +79,12 @@ public NumberInputSpec numberClass(Class<? extends Number> clazz) {
 		return this;
 	}
 
+	@Override
+	public NumberInputSpec required() {
+		this.required = true;
+		return this;
+	}
+
 	@Override
 	public NumberInputSpec renderer(Function<NumberInputContext, List<AttributedString>> renderer) {
 		this.renderer = renderer;
@@ -145,6 +152,10 @@ public Class<? extends Number> getNumberClass() {
 		return clazz;
 	}
 
+	public boolean isRequired() {
+		return required;
+	}
+
 	public Function<NumberInputContext, List<AttributedString>> getRenderer() {
 		return renderer;
 	}

spring-shell-core/src/main/java/org/springframework/shell/component/flow/ComponentFlow.java

@@ -515,7 +515,7 @@ private Stream<OrderedInputOperation> stringInputsStream() {
 
 		private Stream<OrderedInputOperation> numberInputsStream() {
 			return numberInputs.stream().map(input -> {
-				NumberInput selector = new NumberInput(terminal, input.getName(), input.getDefaultValue(), input.getNumberClass());
+				NumberInput selector = new NumberInput(terminal, input.getName(), input.getDefaultValue(), input.getNumberClass(), input.isRequired());
 				UnaryOperator<ComponentContext<?>> operation = context -> {
 					if (input.getResultMode() == ResultMode.ACCEPT && input.isStoreResult()
 							&& input.getResultValue() != null) {
@@ -533,7 +533,10 @@ private Stream<OrderedInputOperation> numberInputsStream() {
 					}
 					if (input.isStoreResult()) {
 						if (input.getResultMode() == ResultMode.VERIFY && input.getResultValue() != null) {
-							selector.addPreRunHandler(c -> c.setDefaultValue(input.getResultValue()));
+							selector.addPreRunHandler(c -> {
+								c.setDefaultValue(input.getResultValue());
+								c.setRequired(input.isRequired());
+							});
 						}
 						selector.addPostRunHandler(c -> c.put(input.getId(), c.getResultValue()));
 					}

spring-shell-core/src/main/java/org/springframework/shell/component/flow/NumberInputSpec.java

@@ -71,6 +71,13 @@ public interface NumberInputSpec extends BaseInputSpec<NumberInputSpec> {
 	 */
 	NumberInputSpec numberClass(Class<? extends Number> clazz);
 
+	/**
+	 * Sets input to required
+	 *
+	 * @return a builder
+	 */
+	NumberInputSpec required();
+
 	/**
 	 * Sets a renderer function.
 	 *

spring-shell-core/src/main/resources/org/springframework/shell/component/number-input-default.stg

@@ -14,6 +14,9 @@ info(model) ::= <%
 <if(model.input)>
   <model.input>
 <else>
+  <if(model.required)>
+    <("[Required]"); format="style-value">
+  <endif>
   <("[Number Type: "); format="style-value"><model.defaultClass; format="style-value"><("]"); format="style-value">
   <if(model.defaultValue)>
     <("[Default "); format="style-value"><model.defaultValue; format="style-value"><("]"); format="style-value">

spring-shell-core/src/test/java/org/springframework/shell/component/NumberInputTests.java

@@ -245,4 +245,37 @@ public void testResultUserInputInvalidInput() throws InterruptedException, IOExc
 		assertThat(run1Context).isNotNull();
 		assertThat(run1Context.getResultValue()).isNull();
 	}
+
+	@Test
+	public void testResultMandatoryInput() throws InterruptedException {
+		ComponentContext<?> empty = ComponentContext.empty();
+		NumberInput component1 = new NumberInput(getTerminal());
+		component1.setResourceLoader(new DefaultResourceLoader());
+		component1.setTemplateExecutor(getTemplateExecutor());
+		component1.setRequired(true);
+
+		service.execute(() -> {
+			NumberInputContext run1Context = component1.run(empty);
+			result1.set(run1Context);
+			latch1.countDown();
+		});
+
+		TestBuffer testBuffer = new TestBuffer().cr();
+		write(testBuffer.getBytes());
+
+		latch1.await(2, TimeUnit.SECONDS);
+
+		NumberInputContext run1Context = result1.get();
+		assertThat(consoleOut()).contains("This field is mandatory");
+		assertThat(run1Context).isNull();
+
+		testBuffer.append("2").cr();
+		write(testBuffer.getBytes());
+
+		latch1.await(2, TimeUnit.SECONDS);
+		run1Context = result1.get();
+
+		assertThat(run1Context).isNotNull();
+		assertThat(run1Context.getResultValue()).isEqualTo(2);
+	}
 }

spring-shell-core/src/test/java/org/springframework/shell/component/flow/ComponentFlowTests.java

@@ -59,6 +59,10 @@ public void testSimpleFlow() throws InterruptedException {
 					.defaultValue(20.5)
 					.numberClass(Double.class)
 					.and()
+				.withNumberInput("number3")
+					.name("Number3")
+					.required()
+					.and()
 				.withPathInput("path1")
 					.name("Path1")
 					.and()
@@ -93,6 +97,9 @@ public void testSimpleFlow() throws InterruptedException {
 		// number2
 		testBuffer = new TestBuffer().cr();
 		write(testBuffer.getBytes());
+		// number3
+		testBuffer = new TestBuffer().cr().append("5").cr();
+		write(testBuffer.getBytes());
 		// path1
 		testBuffer = new TestBuffer().append("fakedir").cr();
 		write(testBuffer.getBytes());
@@ -110,13 +117,15 @@ public void testSimpleFlow() throws InterruptedException {
 		String field2 = inputWizardResult.getContext().get("field2");
 		Integer number1 = inputWizardResult.getContext().get("number1");
 		Double number2 = inputWizardResult.getContext().get("number2");
+		Integer number3 = inputWizardResult.getContext().get("number3");
 		Path path1 = inputWizardResult.getContext().get("path1");
 		String single1 = inputWizardResult.getContext().get("single1");
 		List<String> multi1 = inputWizardResult.getContext().get("multi1");
 		assertThat(field1).isEqualTo("defaultField1Value");
 		assertThat(field2).isEqualTo("Field2Value");
 		assertThat(number1).isEqualTo(35);
 		assertThat(number2).isEqualTo(20.5);
+		assertThat(number3).isEqualTo(5);
 		assertThat(path1.toString()).contains("fakedir");
 		assertThat(single1).isEqualTo("value1");
 		assertThat(multi1).containsExactlyInAnyOrder("value2");

spring-shell-docs/src/main/asciidoc/using-shell-components-ui-numberinput.adoc

@@ -28,6 +28,9 @@ The context object is `NumberInputContext`. The following table lists its contex
 |`defaultClass`
 |The default number class to use, if set. Otherwise, Integer.class.
 
+|`required`
+|`true` if the input is required. Otherwise, false.
+
 |`model`
 |The parent context variables (see <<textcomponentcontext-template-variables>>).
 |===

spring-shell-samples/src/main/java/org/springframework/shell/samples/standard/ComponentCommands.java

@@ -75,6 +75,16 @@ public String numberInputDouble() {
 		return "Got value " + context.getResultValue();
 	}
 
+	@ShellMethod(key = "component number required", value = "Number input", group = "Components")
+	public String numberInputRequired() {
+		NumberInput component = new NumberInput(getTerminal(), "Enter value");
+		component.setRequired(true);
+		component.setResourceLoader(getResourceLoader());
+		component.setTemplateExecutor(getTemplateExecutor());
+		NumberInputContext context = component.run(NumberInputContext.empty());
+		return "Got value " + context.getResultValue();
+	}
+
 	@ShellMethod(key = "component path", value = "Path input", group = "Components")
 	public String pathInput() {
 		PathInput component = new PathInput(getTerminal(), "Enter value");

spring-shell-samples/src/main/java/org/springframework/shell/samples/standard/ComponentFlowCommands.java

@@ -69,6 +69,10 @@ public void showcase1() {
 					.defaultValue(20.5)
 					.numberClass(Double.class)
 					.and()
+				.withNumberInput("number3")
+					.name("Field3")
+					.required()
+					.and()
 				.withConfirmationInput("confirmation1")
 					.name("Confirmation1")
 					.and()