@Model and @Bound annotations for configuring Binder instance from annotation model beans

org.springframework.context/src/main/java/org/springframework/ui/alert/support/DefaultAlertContext.java

@@ -34,7 +34,7 @@ import org.springframework.util.CachingMapDecorator;
 public class DefaultAlertContext implements AlertContext {
 
 	@SuppressWarnings("serial")
-	private Map<String, List<Alert>> alertsByElement = new CachingMapDecorator<String, List<Alert>>(new LinkedHashMap<String, List<Alert>>()) {
+	private Map<String, List<Alert>> alerts = new CachingMapDecorator<String, List<Alert>>(new LinkedHashMap<String, List<Alert>>()) {
 		protected List<Alert> create(String element) {
 			return new ArrayList<Alert>();
 		}
@@ -43,11 +43,11 @@ public class DefaultAlertContext implements AlertContext {
 	// implementing AlertContext
 
 	public Map<String, List<Alert>> getAlerts() {
-		return Collections.unmodifiableMap(alertsByElement);
+		return Collections.unmodifiableMap(alerts);
 	}
 	
 	public List<Alert> getAlerts(String element) {
-		List<Alert> messages = alertsByElement.get(element);
+		List<Alert> messages = alerts.get(element);
 		if (messages.isEmpty()) {
 			return Collections.emptyList();
 		}
@@ -55,12 +55,12 @@ public class DefaultAlertContext implements AlertContext {
 	}
 
 	public void add(Alert alert) {
-		List<Alert> alerts = alertsByElement.get(alert.getElement());
+		List<Alert> alerts = this.alerts.get(alert.getElement());
 		alerts.add(alert);
 	}
 
 	public String toString() {
-		return new ToStringCreator(this).append("alertsByElement", alertsByElement).toString();
+		return new ToStringCreator(this).append("alerts", alerts).toString();
 	}
 
 }

org.springframework.context/src/main/java/org/springframework/ui/binding/Bound.java

@@ -6,7 +6,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target({ElementType.METHOD})
+@Target({ElementType.METHOD, ElementType.FIELD})
 @Retention(RetentionPolicy.RUNTIME)
 @Documented
 public @interface Bound {

org.springframework.context/src/main/java/org/springframework/ui/binding/Model.java

@@ -20,6 +20,6 @@ public @interface Model {
 	 * Configures strict model binding.
 	 * @see Binder#setStrict(boolean)
 	 */
-	boolean strict() default false;
+	boolean strictBinding() default false;
 
 }

org.springframework.context/src/main/java/org/springframework/ui/binding/support/GenericBinder.java

@@ -107,6 +107,10 @@ public class GenericBinder implements Binder {
 		return model;
 	}
 
+	public boolean isStrict() {
+		return strict;
+	}
+
 	public void setStrict(boolean strict) {
 		this.strict = strict;
 	}
@@ -148,7 +152,11 @@ public class GenericBinder implements Binder {
 		ArrayListBindingResults results = new ArrayListBindingResults(values.size());
 		for (UserValue value : values) {
 			BindingImpl binding = (BindingImpl) getBinding(value.getProperty());
-			results.add(binding.setValue(value.getValue()));
+			if (binding != null) {
+				results.add(binding.setValue(value.getValue()));
+			} else {
+				results.add(new NoSuchBindingResult(value));
+			}
 		}
 		return results;
 	}
@@ -449,6 +457,47 @@ public class GenericBinder implements Binder {
 		}
 	}
 
+	static class NoSuchBindingResult implements BindingResult {
+		private UserValue userValue;
+		
+		public NoSuchBindingResult(UserValue userValue) {
+			this.userValue = userValue;
+		}
+		
+		public String getProperty() {
+			return userValue.getProperty();
+		}
+
+		public Object getUserValue() {
+			return userValue.getValue();
+		}
+
+		public boolean isFailure() {
+			return true;
+		}
+
+		public Alert getAlert() {
+			return new AbstractAlert() {
+				public String getElement() {
+					// TODO append model first? e.g. model.property
+					return getProperty();
+				}
+
+				public String getCode() {
+					return "noSuchBinding";
+				}
+
+				public Severity getSeverity() {
+					return Severity.WARNING;
+				}
+
+				public String getMessage() {
+					return "Failed to bind to property '" + userValue.getProperty() + "'; no binding has been added for the property";
+				}
+			};
+		}		
+	}
+	
 	static class InvalidFormatResult implements BindingResult {
 
 		private String property;
@@ -473,7 +522,7 @@ public class GenericBinder implements Binder {
 		}
 
 		public Alert getAlert() {
-			return new Alert() {
+			return new AbstractAlert() {
 				public String getElement() {
 					// TODO append model first? e.g. model.property
 					return getProperty();
@@ -523,7 +572,7 @@ public class GenericBinder implements Binder {
 		}
 
 		public Alert getAlert() {
-			return new Alert() {
+			return new AbstractAlert() {
 				public String getElement() {
 					// TODO append model first? e.g. model.property
 					return getProperty();
@@ -611,7 +660,7 @@ public class GenericBinder implements Binder {
 		}
 		
 		public Alert getAlert() {
-			return new Alert() {
+			return new AbstractAlert() {
 				public String getElement() {
 					// TODO append model first? e.g. model.property					
 					return getProperty();
@@ -632,4 +681,10 @@ public class GenericBinder implements Binder {
 		}
 
 	}
+	
+	static abstract class AbstractAlert implements Alert {
+		public String toString() {
+			return getElement() + ":" + getCode() + " - " + getMessage();
+		}
+	}
 }

org.springframework.context/src/main/java/org/springframework/ui/lifecycle/WebBindAndValidateLifecycle.java

@@ -15,15 +15,25 @@
  */
 package org.springframework.ui.lifecycle;
 
+import java.beans.BeanInfo;
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.Method;
 import java.util.Map;
 
+import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.ui.alert.AlertContext;
+import org.springframework.ui.binding.BindingConfiguration;
 import org.springframework.ui.binding.BindingResult;
 import org.springframework.ui.binding.BindingResults;
+import org.springframework.ui.binding.Bound;
 import org.springframework.ui.binding.FormatterRegistry;
+import org.springframework.ui.binding.Model;
 import org.springframework.ui.binding.UserValues;
 import org.springframework.ui.binding.support.WebBinder;
 import org.springframework.ui.validation.Validator;
+import org.springframework.util.StringUtils;
 
 /**
  * Implementation of the bind and validate lifecycle for web (HTTP) environments.
@@ -41,13 +51,12 @@ public class WebBindAndValidateLifecycle {
 	private Validator validator;
 
 	public WebBindAndValidateLifecycle(Object model, AlertContext alertContext) {
-		// TODO allow binder to be configured with bindings from @Model metadata
-		// TODO support @Bound property annotation?
-		// TODO support @StrictBinding class-level annotation?
 		this.binder = new WebBinder(model);
+		// TODO this doesn't belong in here
+		configure(binder, model);
 		this.alertContext = alertContext;
 	}
-	
+
 	public void setFormatterRegistry(FormatterRegistry registry) {
 		binder.setFormatterRegistry(registry);
 	}
@@ -76,4 +85,35 @@ public class WebBindAndValidateLifecycle {
 		};
 	}
 
+	// internal helpers
+
+	private void configure(WebBinder binder, Object model) {
+		Model m = AnnotationUtils.findAnnotation(model.getClass(), Model.class);
+		if (m != null) {
+			if (StringUtils.hasText(m.value())) {
+				// TODO model name setting
+				//binder.setModelName(m.value());					
+			}
+			binder.setStrict(m.strictBinding());
+		}
+		if (binder.isStrict()) {
+			BeanInfo beanInfo;
+			try {
+				beanInfo = Introspector.getBeanInfo(model.getClass());
+			} catch (IntrospectionException e) {
+				throw new IllegalStateException("Unable to introspect model " + model, e);
+			}
+			// TODO do we have to still flush introspector cache here?
+			for (PropertyDescriptor prop : beanInfo.getPropertyDescriptors()) {
+				Method getter = prop.getReadMethod();
+				Bound b = AnnotationUtils.getAnnotation(getter, Bound.class);
+				if (b != null) {
+					// TODO should we wire formatter here if using a format annotation - an optimization?
+					binder.add(new BindingConfiguration(prop.getName(), null));
+				}
+			}
+			// TODO @Bound fields
+		}
+ 	}
+
 }

org.springframework.context/src/test/java/org/springframework/ui/binding/support/GenericBinderTests.java

@@ -169,6 +169,25 @@ public class GenericBinderTests {
 		assertFalse(result.isFailure());
 	}
 
+	@Test
+	public void bindStrictNoMappingBindings() {
+		binder.setStrict(true);
+		binder.add(new BindingConfiguration("integer", null));
+		UserValues values = new UserValues();
+		values.add("integer", "3");
+		values.add("foo", "BAR");
+		BindingResults results = binder.bind(values);
+		assertEquals(2, results.size());
+		
+		assertEquals("integer", results.get(0).getProperty());
+		assertFalse(results.get(0).isFailure());
+		assertEquals("3", results.get(0).getUserValue());
+
+		assertEquals("foo", results.get(1).getProperty());
+		assertTrue(results.get(1).isFailure());
+		assertEquals("BAR", results.get(1).getUserValue());
+	}
+
 	@Test
 	public void getBindingCustomFormatter() {
 		binder.add(new BindingConfiguration("currency", new CurrencyFormatter()));

org.springframework.context/src/test/java/org/springframework/ui/lifecycle/WebBindAndValidateLifecycleTests.java

@@ -12,11 +12,13 @@ import org.junit.Before;
 import org.junit.Test;
 import org.springframework.ui.alert.Severity;
 import org.springframework.ui.alert.support.DefaultAlertContext;
+import org.springframework.ui.binding.Bound;
+import org.springframework.ui.binding.Model;
 import org.springframework.ui.binding.support.GenericFormatterRegistry;
 import org.springframework.ui.format.number.CurrencyFormat;
 import org.springframework.ui.format.number.IntegerFormatter;
 
-public class WebBindAndLifecycleTests {
+public class WebBindAndValidateLifecycleTests {
 
 	private WebBindAndValidateLifecycle lifecycle;
 
@@ -67,6 +69,37 @@ public class WebBindAndLifecycleTests {
 		assertEquals(Severity.ERROR, alertContext.getAlerts("integer").get(0).getSeverity());
 		assertEquals("Failed to bind to property 'integer'; the user value 'bogus' has an invalid format and could no be parsed", alertContext.getAlerts("integer").get(0).getMessage());
 	}
+	
+	@Test
+	public void testExecuteLifecycleAnnotatedModel() {
+		TestAnnotatedBean model = new TestAnnotatedBean();
+		lifecycle = new WebBindAndValidateLifecycle(model, alertContext);
+		Map<String, Object> userMap = new HashMap<String, Object>();
+		GenericFormatterRegistry registry = new GenericFormatterRegistry();
+		registry.add(new IntegerFormatter(), Integer.class);
+		lifecycle.setFormatterRegistry(registry);
+		userMap.put("editable", "foo");
+		lifecycle.execute(userMap);
+		assertEquals(0, alertContext.getAlerts().size());
+		assertEquals("foo", model.getEditable());
+	}
+
+	@Test
+	public void testExecuteLifecycleAnnotatedModelNonEditableBindingAttempt() {
+		TestAnnotatedBean model = new TestAnnotatedBean();
+		lifecycle = new WebBindAndValidateLifecycle(model, alertContext);
+		Map<String, Object> userMap = new HashMap<String, Object>();
+		GenericFormatterRegistry registry = new GenericFormatterRegistry();
+		registry.add(new IntegerFormatter(), Integer.class);
+		lifecycle.setFormatterRegistry(registry);
+		userMap.put("editable", "foo");
+		userMap.put("nonEditable", "whatev");
+		lifecycle.execute(userMap);
+		assertEquals(1, alertContext.getAlerts().size());
+		assertEquals("foo", model.getEditable());
+		assertEquals(null, model.getNotEditable());
+		assertEquals("noSuchBinding", alertContext.getAlerts("nonEditable").get(0).getCode());
+	}
 
 	public static enum FooEnum {
 		BAR, BAZ, BOOP;
@@ -188,4 +221,31 @@ public class WebBindAndLifecycleTests {
 		}
 
 	}
+	
+	@Model(value="testBean", strictBinding=true)
+	public class TestAnnotatedBean {
+
+		private String editable;
+		
+		private String notEditable;
+		
+		@Bound
+		public String getEditable() {
+			return editable;
+		}
+		
+		public void setEditable(String editable) {
+			this.editable = editable;
+		}
+		
+		public String getNotEditable() {
+			return notEditable;
+		}
+		
+		public void setNotEditable(String notEditable) {
+			this.notEditable = notEditable;
+		}
+		
+		
+	}
 }