full support for formatters on array/collection elements (SPR-6504)

org.springframework.beans/src/main/java/org/springframework/beans/BeanTypeDescriptor.java

@@ -53,11 +53,12 @@ class BeanTypeDescriptor extends TypeDescriptor {
 
 	/**
 	 * Create a new BeanTypeDescriptor for the given bean property.
-	 * @param methodParameter the target method parameter
 	 * @param propertyDescriptor the corresponding JavaBean PropertyDescriptor
+	 * @param methodParameter the target method parameter
+	 * @param type the specific type to expose (may be an array/collection element)
 	 */
-	public BeanTypeDescriptor(MethodParameter methodParameter, PropertyDescriptor propertyDescriptor) {
-		super(methodParameter);
+	public BeanTypeDescriptor(PropertyDescriptor propertyDescriptor, MethodParameter methodParameter, Class type) {
+		super(methodParameter, type);
 		this.propertyDescriptor = propertyDescriptor;
 	}
 

org.springframework.beans/src/main/java/org/springframework/beans/BeanWrapperImpl.java

@@ -354,13 +354,15 @@ public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWra
 
 	public TypeDescriptor getPropertyTypeDescriptor(String propertyName) throws BeansException {
 		try {
-			PropertyDescriptor pd = getPropertyDescriptorInternal(propertyName);
+			String canonicalName = PropertyAccessorUtils.getPropertyName(propertyName);
+			PropertyDescriptor pd = getPropertyDescriptorInternal(canonicalName);
 			if (pd != null) {
+				Class type = getPropertyType(propertyName);
 				if (pd.getReadMethod() != null) {
-					return new BeanTypeDescriptor(new MethodParameter(pd.getReadMethod(), -1), pd);
+					return new BeanTypeDescriptor(pd, new MethodParameter(pd.getReadMethod(), -1), type);
 				}
 				else if (pd.getWriteMethod() != null) {
-					return new BeanTypeDescriptor(BeanUtils.getWriteMethodParameter(pd), pd);
+					return new BeanTypeDescriptor(pd, BeanUtils.getWriteMethodParameter(pd), type);
 				}
 			}
 		}
@@ -579,7 +581,8 @@ public class BeanWrapperImpl extends AbstractPropertyAccessor implements BeanWra
 			}
 		}
 		catch (Exception ex) {
-			throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + name, "Could not instantiate property type [" + type.getName() + "] to auto-grow nested property path: " + ex);
+			throw new NullValueInNestedPathException(getRootClass(), this.nestedPath + name,
+					"Could not instantiate property type [" + type.getName() + "] to auto-grow nested property path: " + ex);
 		}
 	}
 	

org.springframework.context/src/main/java/org/springframework/validation/AbstractPropertyBindingResult.java

@@ -117,10 +117,11 @@ public abstract class AbstractPropertyBindingResult extends AbstractBindingResul
 		if (this.conversionService != null) {
 			// Try custom formatter...
 			TypeDescriptor td = getPropertyAccessor().getPropertyTypeDescriptor(fixedField);
-			return this.conversionService.convert(value, td, TypeDescriptor.valueOf(String.class));
-		} else {
-			return value;
+			if (td != null) {
+				return this.conversionService.convert(value, td, TypeDescriptor.valueOf(String.class));
+			}
 		}
+		return value;
 	}
 
 	/**

org.springframework.context/src/test/java/org/springframework/format/number/NumberFormattingTests.java

@@ -18,6 +18,7 @@ package org.springframework.format.number;
 
 import java.math.BigDecimal;
 import java.util.Locale;
+import java.util.List;
 
 import org.junit.After;
 import static org.junit.Assert.*;
@@ -102,6 +103,43 @@ public class NumberFormattingTests {
 		assertEquals("1,25.00", binder.getBindingResult().getFieldValue("pattern"));
 	}
 
+	@Test
+	public void testPatternArrayFormatting() {
+		MutablePropertyValues propertyValues = new MutablePropertyValues();
+		propertyValues.add("patternArray", new String[] {"1,25.00", "2,35.00"});
+		binder.bind(propertyValues);
+		assertEquals(0, binder.getBindingResult().getErrorCount());
+		assertEquals("1,25.00", binder.getBindingResult().getFieldValue("patternArray[0]"));
+		assertEquals("2,35.00", binder.getBindingResult().getFieldValue("patternArray[1]"));
+
+		propertyValues = new MutablePropertyValues();
+		propertyValues.add("patternArray[0]", "1,25.00");
+		propertyValues.add("patternArray[1]", "2,35.00");
+		binder.bind(propertyValues);
+		assertEquals(0, binder.getBindingResult().getErrorCount());
+		assertEquals("1,25.00", binder.getBindingResult().getFieldValue("patternArray[0]"));
+		assertEquals("2,35.00", binder.getBindingResult().getFieldValue("patternArray[1]"));
+	}
+
+	@Test
+	public void testPatternListFormatting() {
+		MutablePropertyValues propertyValues = new MutablePropertyValues();
+		propertyValues.add("patternList", new String[] {"1,25.00", "2,35.00"});
+		binder.bind(propertyValues);
+		assertEquals(0, binder.getBindingResult().getErrorCount());
+		assertEquals("1,25.00", binder.getBindingResult().getFieldValue("patternList[0]"));
+		assertEquals("2,35.00", binder.getBindingResult().getFieldValue("patternList[1]"));
+
+		propertyValues = new MutablePropertyValues();
+		propertyValues.add("patternList[0]", "1,25.00");
+		propertyValues.add("patternList[1]", "2,35.00");
+		binder.bind(propertyValues);
+		assertEquals(0, binder.getBindingResult().getErrorCount());
+		assertEquals("1,25.00", binder.getBindingResult().getFieldValue("patternList[0]"));
+		assertEquals("2,35.00", binder.getBindingResult().getFieldValue("patternList[1]"));
+	}
+
+
 	@SuppressWarnings("unused")
 	private static class TestBean {
 		
@@ -119,6 +157,12 @@ public class NumberFormattingTests {
 		@NumberFormat(pattern="#,##.00")
 		private BigDecimal pattern;
 
+		@NumberFormat(pattern="#,##.00")
+		private BigDecimal[] patternArray;
+
+		@NumberFormat(pattern="#,##.00")
+		private List[] patternList;
+
 		public Integer getNumberDefault() {
 			return numberDefault;
 		}
@@ -159,6 +203,21 @@ public class NumberFormattingTests {
 			this.pattern = pattern;
 		}
 
-		
+		public BigDecimal[] getPatternArray() {
+			return patternArray;
+		}
+
+		public void setPatternArray(BigDecimal[] patternArray) {
+			this.patternArray = patternArray;
+		}
+
+		public List[] getPatternList() {
+			return patternList;
+		}
+
+		public void setPatternList(List[] patternList) {
+			this.patternList = patternList;
+		}
 	}
-}
+
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/ConversionFailedException.java

@@ -20,6 +20,7 @@ package org.springframework.core.convert;
  * Thrown when an attempt to execute a type conversion fails.
  *
  * @author Keith Donald
+ * @author Juergen Hoeller
  * @since 3.0
  */
 public final class ConversionFailedException extends ConversionException {
@@ -37,8 +38,8 @@ public final class ConversionFailedException extends ConversionException {
 	 * @param cause the cause of the conversion failure
 	 */
 	public ConversionFailedException(TypeDescriptor sourceType, TypeDescriptor targetType, Object value, Throwable cause) {
-		super("Unable to convert value " + value + " from type [" + sourceType.getName() + "] to type [" +
-				targetType.getName() + "]; reason = '" + cause.getMessage() + "'", cause);
+		super("Unable to convert value " + value + " from type '" + sourceType.getName() +
+				"' to type '" + targetType.getName() + "'", cause);
 		this.sourceType = sourceType;
 		this.targetType = targetType;
 	}

org.springframework.core/src/main/java/org/springframework/core/convert/TypeDescriptor.java

@@ -77,6 +77,19 @@ public class TypeDescriptor {
 		this.methodParameter = methodParameter;
 	}
 
+	/**
+	 * Create a new type descriptor from a method or constructor parameter.
+	 * <p>Use this constructor when a target conversion point originates from a method parameter,
+	 * such as a setter method argument.
+	 * @param methodParameter the MethodParameter to wrap
+	 * @param type the specific type to expose (may be an array/collection element)
+	 */
+	protected TypeDescriptor(MethodParameter methodParameter, Class type) {
+		Assert.notNull(methodParameter, "MethodParameter must not be null");
+		this.methodParameter = methodParameter;
+		this.type = type;
+	}
+
 	/**
 	 * Create a new type descriptor for a field.
 	 * Use this constructor when a target conversion point originates from a field.
@@ -158,16 +171,11 @@ public class TypeDescriptor {
 	}
 
 	/**
-	 * Returns the name of this type; the fully qualified classname.
+	 * Returns the name of this type: the fully qualified class name.
 	 */
 	public String getName() {
 		Class<?> type = getType();
-		if (type != null) {
-			return getType().getName();
-		}
-		else {
-			return null;
-		}
+		return (type != null ? ClassUtils.getQualifiedName(type) : null);
 	}
 
 	/**
@@ -396,17 +404,16 @@ public class TypeDescriptor {
 
 	public String toString() {
 		if (this == TypeDescriptor.NULL) {
-			return "[TypeDescriptor.NULL]";
+			return "TypeDescriptor.NULL";
 		}
 		else {
 			StringBuilder builder = new StringBuilder();
-			builder.append("[TypeDescriptor ");
+			builder.append("TypeDescriptor ");
 			Annotation[] anns = getAnnotations();
 			for (Annotation ann : anns) {
 				builder.append("@").append(ann.annotationType().getName()).append(' ');
 			}
-			builder.append(getType().getName());
-			builder.append("]");
+			builder.append(ClassUtils.getQualifiedName(getType()));
 			return builder.toString();
 		}
 	}