nested binding work; list binding still has kinks

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

@@ -15,7 +15,6 @@
  */
 package org.springframework.ui.binding;
 
-import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.ui.alert.Alert;
 import org.springframework.ui.alert.Severity;
 
@@ -114,33 +113,6 @@ public interface Binding {
 	 */
 	void revert();
 
-	/**
-	 * For accessing the raw bound model object.
-	 * @author Keith Donald
-	 */
-	public interface Model {
-		
-		/**
-		 * The model value.
-		 */
-		Object getValue();
-		
-		/**
-		 * The model value type.
-		 */
-		Class<?> getValueType();		
-
-		/**
-		 * The model value type descriptor.
-		 */
-		TypeDescriptor<?> getValueTypeDescriptor();		
-
-		/**
-		 * Set the model value.
-		 */
-		void setValue(Object value);
-	}
-
 	/**
 	 * Get a Binding to a nested property value.
 	 * @param property the nested property name, such as "foo"; should not be a property path like "foo.bar"

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

@@ -0,0 +1,375 @@
+package org.springframework.ui.binding.support;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.ParameterizedType;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.text.ParseException;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+import org.springframework.context.i18n.LocaleContextHolder;
+import org.springframework.core.GenericTypeResolver;
+import org.springframework.core.convert.ConversionFailedException;
+import org.springframework.core.convert.TypeConverter;
+import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.core.style.StylerUtils;
+import org.springframework.ui.alert.Alert;
+import org.springframework.ui.alert.Severity;
+import org.springframework.ui.binding.Binding;
+import org.springframework.ui.binding.support.GenericBinder.BindingContext;
+import org.springframework.ui.format.Formatter;
+import org.springframework.ui.message.MessageBuilder;
+import org.springframework.ui.message.ResolvableArgument;
+
+public abstract class AbstractBinding implements Binding {
+
+	private BindingContext bindingContext;
+
+	private ValueBuffer buffer;
+
+	private BindingStatus status;
+
+	private Object sourceValue;
+	
+	private Exception invalidSourceValueCause;
+	
+	public AbstractBinding(BindingContext bindingContext) {
+		this.bindingContext = bindingContext;
+		buffer = new ValueBuffer(getValueModel());
+		status = BindingStatus.CLEAN;		
+	}
+
+	// implementing Binding
+	
+	public String getRenderValue() {
+		return format(getValue(), bindingContext.getFormatter());
+	}
+
+	public Object getValue() {
+		if (status == BindingStatus.DIRTY || status == BindingStatus.COMMIT_FAILURE) {
+			return buffer.getValue();
+		} else {
+			return getValueModel().getValue();
+		}
+	}
+
+	public Class<?> getValueType() {
+		return getValueModel().getValueType();
+	}
+
+	public boolean isEditable() {
+		return bindingContext.getEditableCondition().isTrue();
+	}
+
+	public boolean isEnabled() {
+		return bindingContext.getEnabledCondition().isTrue();
+	}
+
+	public boolean isVisible() {
+		return bindingContext.getVisibleCondition().isTrue();
+	}
+
+	public void applySourceValue(Object sourceValue) {
+		assertEditable();
+		assertEnabled();
+		if (sourceValue instanceof String) {
+			try {
+				Object parsed = bindingContext.getFormatter().parse((String) sourceValue, getLocale());
+				buffer.setValue(coerseToValueType(parsed));
+				sourceValue = null;
+				status = BindingStatus.DIRTY;
+			} catch (ParseException e) {
+				this.sourceValue = sourceValue;
+				invalidSourceValueCause = e;
+				status = BindingStatus.INVALID_SOURCE_VALUE;
+			} catch (ConversionFailedException e) {
+				this.sourceValue = sourceValue;
+				invalidSourceValueCause = e;
+				status = BindingStatus.INVALID_SOURCE_VALUE;
+			}
+		} else if (sourceValue instanceof String[]) {
+			String[] sourceValues = (String[]) sourceValue;
+			Class<?> parsedType = getFormattedObjectType(bindingContext.getElementFormatter().getClass());
+			if (parsedType == null) {
+				parsedType = String.class;
+			}
+			Object parsed = Array.newInstance(parsedType, sourceValues.length);
+			for (int i = 0; i < sourceValues.length; i++) {
+				Object parsedValue;
+				try {
+					parsedValue = bindingContext.getElementFormatter().parse(sourceValues[i], getLocale());
+					Array.set(parsed, i, parsedValue);
+				} catch (ParseException e) {
+					this.sourceValue = sourceValue;
+					invalidSourceValueCause = e;
+					status = BindingStatus.INVALID_SOURCE_VALUE;
+					break;
+				}
+			}
+			if (status != BindingStatus.INVALID_SOURCE_VALUE) {
+				try {
+					buffer.setValue(coerseToValueType(parsed));
+					sourceValue = null;
+					status = BindingStatus.DIRTY;
+				} catch (ConversionFailedException e) {
+					this.sourceValue = sourceValue;
+					invalidSourceValueCause = e;
+					status = BindingStatus.INVALID_SOURCE_VALUE;
+				}
+			}
+		} else {
+			try {
+				buffer.setValue(coerseToValueType(sourceValue));
+				sourceValue = null;
+				status = BindingStatus.DIRTY;
+			} catch (ConversionFailedException e) {
+				this.sourceValue = sourceValue;
+				invalidSourceValueCause = e;
+				status = BindingStatus.INVALID_SOURCE_VALUE;
+			}
+		}
+	}
+
+	public Object getInvalidSourceValue() {
+		if (status != BindingStatus.INVALID_SOURCE_VALUE) {
+			throw new IllegalStateException("No invalid source value");
+		}
+		return sourceValue;
+	}
+
+	public BindingStatus getStatus() {
+		return status;
+	}
+
+	public Alert getStatusAlert() {
+		if (status == BindingStatus.INVALID_SOURCE_VALUE) {
+			return new AbstractAlert() {
+				public String getCode() {
+					return "typeMismatch";
+				}
+	
+				public String getMessage() {
+					MessageBuilder builder = new MessageBuilder(bindingContext.getMessageSource());
+					builder.code(getCode());
+					if (invalidSourceValueCause instanceof ParseException) {
+						ParseException e = (ParseException) invalidSourceValueCause;
+						builder.arg("label", bindingContext.getLabel());
+						builder.arg("value", sourceValue);
+						builder.arg("errorOffset", e.getErrorOffset());
+						builder.defaultMessage("Failed to bind '" + bindingContext.getLabel() + "'; the source value "
+								+ StylerUtils.style(sourceValue) + " has an invalid format and could no be parsed");
+					} else {
+						ConversionFailedException e = (ConversionFailedException) invalidSourceValueCause;
+						builder.arg("label", new ResolvableArgument(bindingContext.getLabel()));
+						builder.arg("value", sourceValue);
+						builder.defaultMessage("Failed to bind '" + bindingContext.getLabel() + "'; the source value "
+								+ StylerUtils.style(sourceValue) + " has could not be converted to "
+								+ e.getTargetType().getName());
+	
+					}
+					return builder.build();
+				}
+	
+				public Severity getSeverity() {
+					return Severity.ERROR;
+				}
+			};
+		} else if (status == BindingStatus.COMMIT_FAILURE) {
+			return new AbstractAlert() {
+				public String getCode() {
+					return "internalError";
+				}
+	
+				public String getMessage() {
+					buffer.getFlushException().printStackTrace();
+					return "Internal error occurred; message = [" + buffer.getFlushException().getMessage() + "]";
+				}
+	
+				public Severity getSeverity() {
+					return Severity.FATAL;
+				}
+			};
+		} else if (status == BindingStatus.COMMITTED) {
+			return new AbstractAlert() {
+				public String getCode() {
+					return "bindSuccess";
+				}
+	
+				public String getMessage() {
+					return "Binding successful";
+				}
+	
+				public Severity getSeverity() {
+					return Severity.INFO;
+				}
+			};
+		} else {
+			return null;
+		}
+	}
+
+	public void commit() {
+		assertEditable();
+		assertEnabled();
+		if (status == BindingStatus.DIRTY) {
+			buffer.flush();
+			if (buffer.flushFailed()) {
+				status = BindingStatus.COMMIT_FAILURE;
+			} else {
+				status = BindingStatus.COMMITTED;
+			}
+		} else {
+			throw new IllegalStateException("Binding is not dirty; nothing to commit");
+		}
+	}
+
+	public void revert() {
+		if (status == BindingStatus.INVALID_SOURCE_VALUE) {
+			sourceValue = null;
+			invalidSourceValueCause = null;
+			status = BindingStatus.CLEAN;
+		} else if (status == BindingStatus.DIRTY || status == BindingStatus.COMMIT_FAILURE) {
+			buffer.clear();
+			status = BindingStatus.CLEAN;
+		} else {
+			throw new IllegalStateException("Nothing to revert");
+		}
+	}
+
+	public Binding getBinding(String property) {
+		return bindingContext.getBinding(property);
+	}
+
+	public boolean isList() {
+		return List.class.isAssignableFrom(getValueType());
+	}
+
+	public Binding getListElementBinding(int index) {
+		return bindingContext.getListElementBinding(index);
+	}
+
+	public boolean isMap() {
+		return Map.class.isAssignableFrom(getValueType());
+	}
+
+	public Binding getMapValueBinding(Object key) {
+		return bindingContext.getMapValueBinding(key);
+	}
+
+	@SuppressWarnings("unchecked")
+	public String formatValue(Object value) {
+		Formatter formatter;
+		if (isList() || isMap()) {
+			formatter = getBindingContext().getElementFormatter();
+		} else {
+			formatter = getBindingContext().getFormatter();
+		}
+		return format(value, formatter);
+	}
+	
+	// subclassing hooks
+
+	protected BindingContext getBindingContext() {
+		return bindingContext;
+	}
+
+	protected abstract ValueModel getValueModel();
+	
+	protected Locale getLocale() {
+		return LocaleContextHolder.getLocale();
+	}
+	
+	protected String format(Object value, Formatter formatter) {
+		Class<?> formattedType = getFormattedObjectType(formatter.getClass());
+		value = bindingContext.getTypeConverter().convert(value, formattedType);
+		return formatter.format(value, getLocale());
+	}
+
+	private Class getFormattedObjectType(Class formatterClass) {
+		Class classToIntrospect = formatterClass;
+		while (classToIntrospect != null) {
+			Type[] ifcs = classToIntrospect.getGenericInterfaces();
+			for (Type ifc : ifcs) {
+				if (ifc instanceof ParameterizedType) {
+					ParameterizedType paramIfc = (ParameterizedType) ifc;
+					Type rawType = paramIfc.getRawType();
+					if (Formatter.class.equals(rawType)) {
+						Type arg = paramIfc.getActualTypeArguments()[0];
+						if (arg instanceof TypeVariable) {
+							arg = GenericTypeResolver.resolveTypeVariable((TypeVariable) arg, formatterClass);
+						}
+						if (arg instanceof Class) {
+							return (Class) arg;
+						}
+					} else if (Formatter.class.isAssignableFrom((Class) rawType)) {
+						return getFormattedObjectType((Class) rawType);
+					}
+				} else if (Formatter.class.isAssignableFrom((Class) ifc)) {
+					return getFormattedObjectType((Class) ifc);
+				}
+			}
+			classToIntrospect = classToIntrospect.getSuperclass();
+		}
+		return null;
+	}
+
+	private Object coerseToValueType(Object parsed) {
+		TypeDescriptor targetType = getValueModel().getValueTypeDescriptor();
+		TypeConverter converter = bindingContext.getTypeConverter();
+		if (parsed != null && converter.canConvert(parsed.getClass(), targetType)) {
+			return converter.convert(parsed, targetType);
+		} else {
+			return parsed;
+		}
+	}
+
+	private void assertEditable() {
+		if (!isEditable()) {
+			throw new IllegalStateException("Binding is not editable");
+		}
+	}
+
+	private void assertEnabled() {
+		if (!isEditable()) {
+			throw new IllegalStateException("Binding is not enabled");
+		}
+	}
+
+	// internal helpers
+	
+	static abstract class AbstractAlert implements Alert {
+		public String toString() {
+			return getCode() + " - " + getMessage();
+		}
+	}
+
+	/**
+	 * For accessing the raw bound model object.
+	 * @author Keith Donald
+	 */
+	public interface ValueModel {
+		
+		/**
+		 * The model value.
+		 */
+		Object getValue();
+		
+		/**
+		 * The model value type.
+		 */
+		Class<?> getValueType();		
+
+		/**
+		 * The model value type descriptor.
+		 */
+		TypeDescriptor<?> getValueTypeDescriptor();		
+
+		/**
+		 * Set the model value.
+		 */
+		void setValue(Object value);
+	}
+
+}

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

@@ -52,15 +52,15 @@ public class GenericBinder implements Binder {
 	private Object model;
 
 	private Map<String, GenericBindingRule> bindingRules;
-	
+
 	private FormatterRegistry formatterRegistry;
-	
+
 	private TypeConverter typeConverter;
 
 	private MessageSource messageSource;
 
 	private String[] requiredProperties = new String[0];
-	
+
 	/**
 	 * Creates a new binder for the model object.
 	 * @param model the model object containing properties this binder will bind to
@@ -82,7 +82,7 @@ public class GenericBinder implements Binder {
 		Assert.notNull(formatterRegistry, "The FormatterRegistry is required");
 		this.formatterRegistry = formatterRegistry;
 	}
-	
+
 	/**
 	 * Configure the MessageSource that resolves localized {@link BindingResult} alert messages.
 	 * @param messageSource the message source
@@ -116,7 +116,7 @@ public class GenericBinder implements Binder {
 		}
 		return rule;
 	}
-	
+
 	// implementing Binder
 
 	public Object getModel() {
@@ -126,6 +126,7 @@ public class GenericBinder implements Binder {
 	public Binding getBinding(String property) {
 		PropertyPath path = new PropertyPath(property);
 		Binding binding = getBindingRule(path.getFirstElement().getValue()).getBinding(model);
+		System.out.println(path);
 		for (PropertyPathElement element : path.getNestedElements()) {
 			if (element.isIndex()) {
 				if (binding.isMap()) {
@@ -158,7 +159,7 @@ public class GenericBinder implements Binder {
 	}
 
 	// subclassing hooks
-	
+
 	/**
 	 * Hook subclasses may use to filter the source values to bind.
 	 * This hook allows the binder to pre-process the source values before binding occurs.
@@ -190,7 +191,7 @@ public class GenericBinder implements Binder {
 			throw new MissingSourceValuesException(missingRequired, sourceValues);
 		}
 	}
-	
+
 	private GenericBindingRule getBindingRule(String property) {
 		GenericBindingRule rule = bindingRules.get(property);
 		if (rule == null) {
@@ -199,7 +200,7 @@ public class GenericBinder implements Binder {
 		}
 		return rule;
 	}
-	
+
 	private BindingResult bind(Map.Entry<String, ? extends Object> sourceValue, Binding binding) {
 		String property = sourceValue.getKey();
 		Object value = sourceValue.getValue();
@@ -218,41 +219,42 @@ public class GenericBinder implements Binder {
 	class GenericBindingRule implements BindingRuleConfiguration, BindingContext {
 
 		private Class<?> modelClass;
-		
+
 		private PropertyDescriptor property;
-		
+
 		private Formatter formatter;
-		
+
 		private Formatter elementFormatter;
-		
+
 		private Formatter keyFormatter;
-		
+
 		private Condition editableCondition = Condition.ALWAYS_TRUE;
-		
+
 		private Condition enabledCondition = Condition.ALWAYS_TRUE;
-		
+
-		private Condition visibleCondition  = Condition.ALWAYS_TRUE;
+		private Condition visibleCondition = Condition.ALWAYS_TRUE;
-		
+
 		private Map<String, GenericBindingRule> nestedBindingRules;
-		
+
 		private Binding binding;
-		
+
+		private Map<Integer, Binding> listElementBindings;
+
 		public GenericBindingRule(String property, Class modelClass) {
 			this.modelClass = modelClass;
 			this.property = findPropertyDescriptor(property);
-			nestedBindingRules = new HashMap<String, GenericBindingRule>();
 		}
-		
+
 		// implementing BindingContext
 
 		public MessageSource getMessageSource() {
 			return messageSource;
 		}
-		
+
 		public TypeConverter getTypeConverter() {
 			return typeConverter;
-		}	
+		}
-		
+
 		public Formatter<?> getFormatter() {
 			if (formatter != null) {
 				return formatter;
@@ -288,9 +290,82 @@ public class GenericBinder implements Binder {
 		public Condition getVisibleCondition() {
 			return visibleCondition;
 		}
-		
+
-		public Binding getBinding(String property, Object model) {
+		public Binding getBinding(String property) {
-			return getBindingRule(property, model.getClass()).getBinding(model);
+			createValueIfNecessary();
+			return getBindingRule(property, binding.getValueType()).getBinding(binding.getValue());
+		}
+
+		public Binding getListElementBinding(final int index) {
+			if (listElementBindings == null) {
+				listElementBindings = new HashMap<Integer, Binding>();
+			}
+			growListIfNecessary(index);
+			Binding binding = listElementBindings.get(index);
+			if (binding == null) {
+				BindingContext listContext = new BindingContext() {
+					public MessageSource getMessageSource() {
+						return GenericBindingRule.this.getMessageSource();
+					}
+
+					public TypeConverter getTypeConverter() {
+						return GenericBindingRule.this.getTypeConverter();
+					}
+
+					public Binding getBinding(String property) {
+						Object model = ((List) GenericBindingRule.this.binding.getValue()).get(index);
+						return GenericBindingRule.this.getBindingRule(property, getElementType()).getBinding(model);
+					}
+
+					public Formatter getFormatter() {
+						return GenericBindingRule.this.getElementFormatter();
+					}
+
+					public Formatter getElementFormatter() {
+						return null;
+					}
+
+					public Formatter getKeyFormatter() {
+						return null;
+					}
+
+					public Condition getEditableCondition() {
+						return GenericBindingRule.this.getEditableCondition();
+					}
+
+					public Condition getEnabledCondition() {
+						return GenericBindingRule.this.getEnabledCondition();
+					}
+
+					public Condition getVisibleCondition() {
+						return GenericBindingRule.this.getVisibleCondition();
+					}
+
+					public Binding getListElementBinding(int index) {
+						throw new IllegalArgumentException("Not yet supported");
+					}
+
+					public Binding getMapValueBinding(Object key) {
+						throw new IllegalArgumentException("Not yet supported");
+					}
+
+					public String getLabel() {
+						return GenericBindingRule.this.getLabel() + "[" + index + "]";
+					}
+
+				};
+				binding = new ListElementBinding(index, getElementType(), (List) this.binding.getValue(), listContext);
+				listElementBindings.put(index, binding);
+			}
+			return binding;
+		}
+
+		public Binding getMapValueBinding(Object key) {
+			return null;
+		}
+
+		public String getLabel() {
+			return property.getName();
 		}
 
 		// implementing BindingRuleConfiguration
@@ -302,7 +377,8 @@ public class GenericBinder implements Binder {
 
 		public BindingRuleConfiguration formatElementsWith(Formatter<?> formatter) {
 			if (!List.class.isAssignableFrom(modelClass) || modelClass.isArray()) {
-				throw new IllegalStateException("Bound property is not a List or an array; cannot set a element formatter");
+				throw new IllegalStateException(
+						"Bound property is not a List or an array; cannot set a element formatter");
 			}
 			elementFormatter = formatter;
 			return this;
@@ -330,7 +406,7 @@ public class GenericBinder implements Binder {
 			visibleCondition = condition;
 			return this;
 		}
-		
+
 		// internal helpers
 
 		private Class<?> getElementType() {
@@ -344,8 +420,11 @@ public class GenericBinder implements Binder {
 		GenericBindingRule getBindingRule(String property) {
 			return getBindingRule(property, this.property.getPropertyType());
 		}
-		
+
-		GenericBindingRule getBindingRule(String property, Class modelClass) {
+		GenericBindingRule getBindingRule(String property, Class<?> modelClass) {
+			if (nestedBindingRules == null) {
+				nestedBindingRules = new HashMap<String, GenericBindingRule>();
+			}
 			GenericBindingRule rule = nestedBindingRules.get(property);
 			if (rule == null) {
 				rule = new GenericBindingRule(property, modelClass);
@@ -353,12 +432,14 @@ public class GenericBinder implements Binder {
 			}
 			return rule;
 		}
-		
+
+		// internal helpers
+
 		Binding getBinding(Object model) {
 			if (binding == null) {
 				binding = new PropertyBinding(property, model, this);
 			}
-			return binding; 
+			return binding;
 		}
 
 		private PropertyDescriptor findPropertyDescriptor(String property) {
@@ -378,12 +459,55 @@ public class GenericBinder implements Binder {
 				throw new IllegalStateException("Unable to introspect model type " + clazz);
 			}
 		}
+
+		private void createValueIfNecessary() {
+			Object value = binding.getValue();
+			if (value == null) {
+				value = newValue(binding.getValueType());
+				binding.applySourceValue(value);
+				binding.commit();
+			}
+		}
+
+		private void growListIfNecessary(int index) {
+			List list = (List) binding.getValue();
+			if (list == null) {
+				list = newListValue(binding.getValueType());
+				binding.applySourceValue(list);
+				binding.commit();
+				list = (List) binding.getValue();
+			}
+			if (index >= list.size()) {
+				for (int i = list.size(); i <= index; i++) {
+					list.add(newValue(getElementType()));
+				}
+			}
+		}
+
+		private List newListValue(Class<?> type) {
+			if (type.isInterface()) {
+				return (List) newValue(ArrayList.class);
+			} else {
+				return (List) newValue(type);
+			}
+		}
+
+		private Object newValue(Class<?> type) {
+			try {
+				return type.newInstance();
+			} catch (InstantiationException e) {
+				throw new IllegalStateException("Could not instantiate element of type [" + type.getName() + "]", e);
+			} catch (IllegalAccessException e) {
+				throw new IllegalStateException("Could not instantiate element of type [" + type.getName() + "]", e);
+			}
+		}
+
 	}
-	
+
 	public interface BindingContext {
-		
+
 		MessageSource getMessageSource();
-		
+
 		TypeConverter getTypeConverter();
 
 		Condition getEditableCondition();
@@ -392,17 +516,20 @@ public class GenericBinder implements Binder {
 
 		Condition getVisibleCondition();
 
-		Binding getBinding(String property, Object model);
+		Binding getBinding(String property);
 
-		@SuppressWarnings("unchecked")
 		Formatter getFormatter();
 
-		@SuppressWarnings("unchecked")
 		Formatter getElementFormatter();
 
-		@SuppressWarnings("unchecked")
 		Formatter getKeyFormatter();
 
+		Binding getListElementBinding(int index);
+
+		Binding getMapValueBinding(Object key);
+
+		String getLabel();
+
 	}
 
 	public void setRequired(String[] propertyPaths) {

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

@@ -0,0 +1,51 @@
+package org.springframework.ui.binding.support;
+
+import java.util.List;
+
+import org.springframework.core.convert.TypeDescriptor;
+import org.springframework.ui.binding.support.GenericBinder.BindingContext;
+
+public class ListElementBinding extends AbstractBinding {
+	
+	private List list;
+	
+	private int index;
+
+	private Class<?> elementType;
+	
+	private BindingContext bindingContext;
+	
+	public ListElementBinding(int index, Class<?> elementType, List list, BindingContext bindingContext) {
+		super(bindingContext);
+		this.index = index;
+		this.elementType = elementType;
+		this.list = list;
+		this.bindingContext = bindingContext;
+	}
+	
+	@Override
+	protected ValueModel getValueModel() {
+		return new ValueModel() {
+			public Object getValue() {
+				return list.get(index);
+			}
+
+			public Class<?> getValueType() {
+				if (elementType != null) {
+					return elementType;
+				} else {
+					return getValue().getClass();
+				}
+			}
+
+			public TypeDescriptor<?> getValueTypeDescriptor() {
+				return TypeDescriptor.valueOf(getValueType());
+			}
+
+			public void setValue(Object value) {
+				list.set(index, value);
+			}
+		};
+	}
+
+}

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

@@ -1,263 +1,36 @@
 package org.springframework.ui.binding.support;
 
 import java.beans.PropertyDescriptor;
-import java.lang.reflect.Array;
-import java.lang.reflect.ParameterizedType;
-import java.lang.reflect.Type;
-import java.lang.reflect.TypeVariable;
-import java.text.ParseException;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Locale;
-import java.util.Map;
 
-import org.springframework.context.i18n.LocaleContextHolder;
-import org.springframework.core.GenericCollectionTypeResolver;
-import org.springframework.core.GenericTypeResolver;
 import org.springframework.core.MethodParameter;
-import org.springframework.core.convert.ConversionFailedException;
-import org.springframework.core.convert.TypeConverter;
 import org.springframework.core.convert.TypeDescriptor;
-import org.springframework.core.style.StylerUtils;
-import org.springframework.ui.alert.Alert;
-import org.springframework.ui.alert.Severity;
 import org.springframework.ui.binding.Binding;
 import org.springframework.ui.binding.support.GenericBinder.BindingContext;
-import org.springframework.ui.format.Formatter;
-import org.springframework.ui.message.MessageBuilder;
-import org.springframework.ui.message.ResolvableArgument;
 import org.springframework.util.ReflectionUtils;
 
-@SuppressWarnings("unchecked")
+public class PropertyBinding extends AbstractBinding implements Binding {
-public class PropertyBinding implements Binding {
 
 	private PropertyDescriptor property;
 
 	private Object object;
 
-	private BindingContext bindingContext;
-
-	private Object sourceValue;
-
-	private Exception invalidSourceValueCause;
-
-	private ValueBuffer buffer;
-
-	private BindingStatus status;
-
-	private Map<Integer, ListElementBinding> listElementBindings;
-
-	private Class<?> elementType;
-
 	public PropertyBinding(PropertyDescriptor property, Object object, BindingContext bindingContext) {
+		super(bindingContext);
 		this.property = property;
 		this.object = object;
-		this.bindingContext = bindingContext;
-		buffer = new ValueBuffer(getModel());
-		status = BindingStatus.CLEAN;
-		if (isList()) {
-			listElementBindings = new HashMap<Integer, ListElementBinding>();
-			elementType = GenericCollectionTypeResolver.getCollectionReturnType(property.getReadMethod());
-		}
-	}
-
-	public String getRenderValue() {
-		return format(getValue(), getFormatter());
-	}
-
-	public Object getValue() {
-		if (status == BindingStatus.DIRTY || status == BindingStatus.COMMIT_FAILURE) {
-			return buffer.getValue();
-		} else {
-			return getModel().getValue();
-		}
-	}
-
-	public Class<?> getValueType() {
-		return getModel().getValueType();
 	}
 
+	// Binding overrides
+	
+	@Override
 	public boolean isEditable() {
-		return isWriteableProperty() && bindingContext.getEditableCondition().isTrue();
+		return isWriteable() && super.isEditable();
 	}
 
-	public boolean isEnabled() {
+	// implementing
-		return bindingContext.getEnabledCondition().isTrue();
+	
-	}
+	protected ValueModel getValueModel() {
-
+		return new ValueModel() {
-	public boolean isVisible() {
-		return bindingContext.getVisibleCondition().isTrue();
-	}
-
-	public void applySourceValue(Object sourceValue) {
-		assertEditable();
-		assertEnabled();
-		if (sourceValue instanceof String) {
-			try {
-				Object parsed = getFormatter().parse((String) sourceValue, getLocale());
-				buffer.setValue(coerseToValueType(parsed));
-				sourceValue = null;
-				status = BindingStatus.DIRTY;
-			} catch (ParseException e) {
-				this.sourceValue = sourceValue;
-				invalidSourceValueCause = e;
-				status = BindingStatus.INVALID_SOURCE_VALUE;
-			} catch (ConversionFailedException e) {
-				this.sourceValue = sourceValue;
-				invalidSourceValueCause = e;
-				status = BindingStatus.INVALID_SOURCE_VALUE;
-			}
-		} else if (sourceValue instanceof String[]) {
-			String[] sourceValues = (String[]) sourceValue;
-			Class<?> parsedType = getFormattedObjectType(bindingContext.getElementFormatter().getClass());
-			if (parsedType == null) {
-				parsedType = String.class;
-			}
-			Object parsed = Array.newInstance(parsedType, sourceValues.length);
-			for (int i = 0; i < sourceValues.length; i++) {
-				Object parsedValue;
-				try {
-					parsedValue = bindingContext.getElementFormatter().parse(sourceValues[i], getLocale());
-					Array.set(parsed, i, parsedValue);
-				} catch (ParseException e) {
-					this.sourceValue = sourceValue;
-					invalidSourceValueCause = e;
-					status = BindingStatus.INVALID_SOURCE_VALUE;
-					break;
-				}
-			}
-			if (status != BindingStatus.INVALID_SOURCE_VALUE) {
-				try {
-					buffer.setValue(coerseToValueType(parsed));
-					sourceValue = null;
-					status = BindingStatus.DIRTY;
-				} catch (ConversionFailedException e) {
-					this.sourceValue = sourceValue;
-					invalidSourceValueCause = e;
-					status = BindingStatus.INVALID_SOURCE_VALUE;
-				}
-			}
-		} else {
-			try {
-				buffer.setValue(coerseToValueType(sourceValue));
-				sourceValue = null;
-				status = BindingStatus.DIRTY;
-			} catch (ConversionFailedException e) {
-				this.sourceValue = sourceValue;
-				invalidSourceValueCause = e;
-				status = BindingStatus.INVALID_SOURCE_VALUE;
-			}
-		}
-	}
-
-	public Object getInvalidSourceValue() {
-		if (status != BindingStatus.INVALID_SOURCE_VALUE) {
-			throw new IllegalStateException("No invalid source value");
-		}
-		return sourceValue;
-	}
-
-	public BindingStatus getStatus() {
-		return status;
-	}
-
-	public Alert getStatusAlert() {
-		if (status == BindingStatus.INVALID_SOURCE_VALUE) {
-			return new AbstractAlert() {
-				public String getCode() {
-					return "typeMismatch";
-				}
-
-				public String getMessage() {
-					MessageBuilder builder = new MessageBuilder(bindingContext.getMessageSource());
-					builder.code(getCode());
-					if (invalidSourceValueCause instanceof ParseException) {
-						ParseException e = (ParseException) invalidSourceValueCause;
-						builder.arg("label", new ResolvableArgument(property.getName()));
-						builder.arg("value", sourceValue);
-						builder.arg("errorOffset", e.getErrorOffset());
-						builder.defaultMessage("Failed to bind to property '" + property + "'; the user value "
-								+ StylerUtils.style(sourceValue) + " has an invalid format and could no be parsed");
-					} else {
-						ConversionFailedException e = (ConversionFailedException) invalidSourceValueCause;
-						builder.arg("label", new ResolvableArgument(property.getName()));
-						builder.arg("value", sourceValue);
-						builder.defaultMessage("Failed to bind to property '" + property + "'; the user value "
-								+ StylerUtils.style(sourceValue) + " has could not be converted to "
-								+ e.getTargetType().getName());
-
-					}
-					return builder.build();
-				}
-
-				public Severity getSeverity() {
-					return Severity.ERROR;
-				}
-			};
-		} else if (status == BindingStatus.COMMIT_FAILURE) {
-			return new AbstractAlert() {
-				public String getCode() {
-					return "internalError";
-				}
-
-				public String getMessage() {
-					return "Internal error occurred; message = [" + buffer.getFlushException().getMessage() + "]";
-				}
-
-				public Severity getSeverity() {
-					return Severity.FATAL;
-				}
-			};
-		} else if (status == BindingStatus.COMMITTED) {
-			return new AbstractAlert() {
-				public String getCode() {
-					return "bindSucces";
-				}
-
-				public String getMessage() {
-					return "Binding successful";
-				}
-
-				public Severity getSeverity() {
-					return Severity.INFO;
-				}
-			};
-		} else {
-			return null;
-		}
-	}
-
-	public void commit() {
-		assertEditable();
-		assertEnabled();
-		if (status == BindingStatus.DIRTY) {
-			buffer.flush();
-			if (buffer.flushFailed()) {
-				status = BindingStatus.COMMIT_FAILURE;
-			} else {
-				status = BindingStatus.COMMITTED;
-			}
-		} else {
-			throw new IllegalStateException("Binding is not dirty; nothing to commit");
-		}
-	}
-
-	public void revert() {
-		if (status == BindingStatus.INVALID_SOURCE_VALUE) {
-			sourceValue = null;
-			invalidSourceValueCause = null;
-			status = BindingStatus.CLEAN;
-		} else if (status == BindingStatus.DIRTY || status == BindingStatus.COMMIT_FAILURE) {
-			buffer.clear();
-			status = BindingStatus.CLEAN;
-		} else {
-			throw new IllegalStateException("Nothing to revert");
-		}
-	}
-
-	public Model getModel() {
-		return new Model() {
 			public Object getValue() {
 				return ReflectionUtils.invokeMethod(property.getReadMethod(), object);
 			}
@@ -266,6 +39,7 @@ public class PropertyBinding implements Binding {
 				return property.getPropertyType();
 			}
 
+			@SuppressWarnings("unchecked")
 			public TypeDescriptor<?> getValueTypeDescriptor() {
 				return new TypeDescriptor(new MethodParameter(property.getReadMethod(), -1));
 			}
@@ -275,232 +49,10 @@ public class PropertyBinding implements Binding {
 			}
 		};
 	}
-
+	
-	public Binding getBinding(String property) {
-		assertScalarProperty();
-		if (getValue() == null) {
-			getModel().setValue(newValue(getValueType()));
-		}
-		return bindingContext.getBinding(property, getValue());
-	}
-
-	public boolean isList() {
-		return List.class.isAssignableFrom(getValueType());
-	}
-
-	public Binding getListElementBinding(int index) {
-		assertListProperty();
-		if (index < 0) {
-			throw new IllegalArgumentException("Invalid index " + index);
-		}
-		growListIfNecessary(index);
-		ListElementBinding binding = listElementBindings.get(index);
-		if (binding == null) {
-			binding = new ListElementBinding(index);
-			listElementBindings.put(index, binding);
-		}
-		return binding;
-	}
-
-	public boolean isMap() {
-		return Map.class.isAssignableFrom(getValueType());
-	}
-
-	public Binding getMapValueBinding(Object key) {
-		assertMapProperty();
-		if (key instanceof String) {
-			try {
-				key = bindingContext.getKeyFormatter().parse((String) key, getLocale());
-			} catch (ParseException e) {
-				throw new IllegalArgumentException("Invald key", e);
-			}
-		}
-		//TODO return new KeyedPropertyBinding(key, (Map) getValue(), getMapTypeDescriptor());
-		return null;
-	}
-
-	public String formatValue(Object value) {
-		Formatter formatter;
-		if (isList() || isMap()) {
-			formatter = bindingContext.getElementFormatter();
-		} else {
-			formatter = bindingContext.getFormatter();
-		}
-		return format(value, formatter);
-	}
-
-	// subclassing hooks
-
-	protected Formatter getFormatter() {
-		return bindingContext.getFormatter();
-	}
-
 	// internal helpers
 	
-	private String format(Object value, Formatter formatter) {
+	private boolean isWriteable() {
-		Class<?> formattedType = getFormattedObjectType(formatter.getClass());
-		value = bindingContext.getTypeConverter().convert(value, formattedType);
-		return formatter.format(value, getLocale());
-	}
-
-	private Locale getLocale() {
-		return LocaleContextHolder.getLocale();
-	}
-	
-	private Class getFormattedObjectType(Class formatterClass) {
-		Class classToIntrospect = formatterClass;
-		while (classToIntrospect != null) {
-			Type[] ifcs = classToIntrospect.getGenericInterfaces();
-			for (Type ifc : ifcs) {
-				if (ifc instanceof ParameterizedType) {
-					ParameterizedType paramIfc = (ParameterizedType) ifc;
-					Type rawType = paramIfc.getRawType();
-					if (Formatter.class.equals(rawType)) {
-						Type arg = paramIfc.getActualTypeArguments()[0];
-						if (arg instanceof TypeVariable) {
-							arg = GenericTypeResolver.resolveTypeVariable((TypeVariable) arg, formatterClass);
-						}
-						if (arg instanceof Class) {
-							return (Class) arg;
-						}
-					} else if (Formatter.class.isAssignableFrom((Class) rawType)) {
-						return getFormattedObjectType((Class) rawType);
-					}
-				} else if (Formatter.class.isAssignableFrom((Class) ifc)) {
-					return getFormattedObjectType((Class) ifc);
-				}
-			}
-			classToIntrospect = classToIntrospect.getSuperclass();
-		}
-		return null;
-	}
-
-	private Object coerseToValueType(Object parsed) {
-		TypeDescriptor targetType = getModel().getValueTypeDescriptor();
-		TypeConverter converter = bindingContext.getTypeConverter();
-		if (parsed != null && converter.canConvert(parsed.getClass(), targetType)) {
-			return converter.convert(parsed, targetType);
-		} else {
-			return parsed;
-		}
-	}
-
-	private void assertScalarProperty() {
-		if (isList()) {
-			throw new IllegalArgumentException("Is a Collection but should be a scalar");
-		}
-		if (isMap()) {
-			throw new IllegalArgumentException("Is a Map but should be a scalar");
-		}
-	}
-
-	private void assertListProperty() {
-		if (!isList()) {
-			throw new IllegalStateException("Not a List property binding");
-		}
-	}
-
-	private void assertMapProperty() {
-		if (!isList()) {
-			throw new IllegalStateException("Not a Map property binding");
-		}
-	}
-
-	private void assertEditable() {
-		if (!isEditable()) {
-			throw new IllegalStateException("Binding is not editable");
-		}
-	}
-
-	private void assertEnabled() {
-		if (!isEditable()) {
-			throw new IllegalStateException("Binding is not enabled");
-		}
-	}
-
-	private boolean isWriteableProperty() {
 		return property.getWriteMethod() != null;
 	}
-
-	private void growListIfNecessary(int index) {
-		List list = (List) getValue();
-		if (list == null) {
-			getModel().setValue(newListValue(getValueType()));
-			list = (List) getValue();
-		}
-		if (index >= list.size()) {
-			for (int i = list.size(); i <= index; i++) {
-				list.add(newValue(elementType));
-			}
-		}
-	}
-
-	private Object newListValue(Class<?> type) {
-		if (type.isInterface()) {
-			return newValue(ArrayList.class);
-		} else {
-			return newValue(type);
-		}
-	}
-	
-	private Object newValue(Class<?> type) {
-		try {
-			return type.newInstance();
-		} catch (InstantiationException e) {
-			throw new IllegalStateException("Could not instantiate element of type [" + type.getName() + "]", e);
-		} catch (IllegalAccessException e) {
-			throw new IllegalStateException("Could not instantiate element of type [" + type.getName() + "]", e);
-		}		
-	}
-	
-	static abstract class AbstractAlert implements Alert {
-		public String toString() {
-			return getCode() + " - " + getMessage();
-		}
-	}
-
-	class ListElementBinding extends PropertyBinding {
-
-		private int index;
-
-		public ListElementBinding(int index) {
-			super(property, object, bindingContext);
-			this.index = index;
-		}
-
-		protected Formatter getFormatter() {
-			return bindingContext.getElementFormatter();
-		}
-
-		public Model getModel() {
-			return new Model() {
-				public Object getValue() {
-					return getList().get(index);
-				}
-
-				public Class<?> getValueType() {
-					if (elementType != null) {
-						return elementType;
-					} else {
-						return getValue().getClass();
-					}
-				}
-
-				public TypeDescriptor<?> getValueTypeDescriptor() {
-					return TypeDescriptor.valueOf(getValueType());
-				}
-
-				public void setValue(Object value) {
-					getList().set(index, value);
-				}
-			};
-		}
-
-		// internal helpers
-
-		private List getList() {
-			return (List) PropertyBinding.this.getValue();
-		}
-	}
-
 }

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

@@ -46,5 +46,9 @@ public class PropertyPath implements Iterable<PropertyPathElement> {
 	public Iterator<PropertyPathElement> iterator() {
 		return elements.iterator();
 	}
+	
+	public String toString() {
+		return elements.toString();
+	}
 
 }

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

@@ -25,4 +25,8 @@ public class PropertyPathElement {
 	public int getIntValue() {
 		return Integer.parseInt(value);
 	}
+	
+	public String toString() {
+		return value + ";index=" + index;
+	}
 }

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

@@ -3,7 +3,7 @@
  */
 package org.springframework.ui.binding.support;
 
-import org.springframework.ui.binding.Binding.Model;
+import org.springframework.ui.binding.support.AbstractBinding.ValueModel;
 
 class ValueBuffer {
 
@@ -11,13 +11,13 @@ class ValueBuffer {
 	
 	private boolean hasValue;
 	
-	private Model model;
+	private ValueModel model;
 	
 	private boolean flushFailed;
 	
 	private Exception flushException;
 	
-	public ValueBuffer(Model model) {
+	public ValueBuffer(ValueModel model) {
 		this.model = model;
 	}
 	

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

@@ -83,7 +83,7 @@ public class WebBinder extends GenericBinder {
 	}
 
 	protected Object getEmptyValue(PropertyBinding binding) {
-		Class<?> type = binding.getModel().getValueType();
+		Class<?> type = binding.getValueModel().getValueType();
 		if (boolean.class.equals(type) || Boolean.class.equals(type)) {
 			return Boolean.FALSE;
 		} else {

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

@@ -63,7 +63,6 @@ public class GenericBinderTests {
 		values.put("integer", "3");
 		values.put("foo", "BAR");
 		BindingResults results = binder.bind(values);
-		System.out.println(results);
 		assertEquals(3, results.size());
 
 		assertEquals("string", results.get(0).getProperty());
@@ -251,7 +250,7 @@ public class GenericBinderTests {
 		values.put("addresses[0]", "4655 Macy Lane:Melbourne:FL:35452");		
 		values.put("addresses[1]", "1234 Rostock Circle:Palm Bay:FL:32901");	
 		values.put("addresses[5]", "1977 Bel Aire Estates:Coker:AL:12345");
-		binder.bind(values);
+		BindingResults results = binder.bind(values);
 		Assert.assertEquals(6, bean.addresses.size());
 		assertEquals("4655 Macy Lane", bean.addresses.get(0).street);
 		assertEquals("Melbourne", bean.addresses.get(0).city);