alignment with backported 3.0.6 code (SPR-8538)

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToArrayConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToCollectionConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -49,7 +49,7 @@ final class ArrayToCollectionConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType.getElementTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType.getElementTypeDescriptor(), this.conversionService);
 	}
 
 	@SuppressWarnings("unchecked")
@@ -64,7 +64,8 @@ final class ArrayToCollectionConverter implements ConditionalGenericConverter {
 				Object sourceElement = Array.get(source, i);
 				target.add(sourceElement);
 			}
-		} else {
+		}
+		else {
 			for (int i = 0; i < length; i++) {
 				Object sourceElement = Array.get(source, i);
 				Object targetElement = this.conversionService.convert(sourceElement, sourceType.elementTypeDescriptor(sourceElement), targetType.getElementTypeDescriptor());

org.springframework.core/src/main/java/org/springframework/core/convert/support/ArrayToObjectConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -43,7 +43,7 @@ final class ArrayToObjectConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, this.conversionService);
 	}
 	
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToArrayConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -49,7 +49,7 @@ final class CollectionToArrayConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType.getElementTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType.getElementTypeDescriptor(), this.conversionService);
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
@@ -66,4 +66,4 @@ final class CollectionToArrayConverter implements ConditionalGenericConverter {
 		return array;
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToCollectionConverter.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -63,7 +63,8 @@ final class CollectionToCollectionConverter implements ConditionalGenericConvert
 			for (Object element : sourceCollection) {
 				target.add(element);
 			}
-		} else {
+		}
+		else {
 			for (Object sourceElement : sourceCollection) {
 				Object targetElement = this.conversionService.convert(sourceElement, sourceType.elementTypeDescriptor(sourceElement), targetType.getElementTypeDescriptor());
 				target.add(targetElement);
@@ -72,4 +73,4 @@ final class CollectionToCollectionConverter implements ConditionalGenericConvert
 		return target;
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToObjectConverter.java

@@ -43,7 +43,7 @@ final class CollectionToObjectConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, this.conversionService);
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {

org.springframework.core/src/main/java/org/springframework/core/convert/support/CollectionToStringConverter.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,7 +45,7 @@ final class CollectionToStringConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getElementTypeDescriptor(), targetType, this.conversionService);
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
@@ -69,4 +69,4 @@ final class CollectionToStringConverter implements ConditionalGenericConverter {
 		return sb.toString();
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/ConversionUtils.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@ abstract class ConversionUtils {
 			throw new ConversionFailedException(sourceType, targetType, source, ex);
 		}
 	}
-	
+
 	public static boolean canConvertElements(TypeDescriptor sourceElementType, TypeDescriptor targetElementType, ConversionService conversionService) {
 		if (targetElementType == null) {
 			// yes
@@ -51,19 +51,18 @@ abstract class ConversionUtils {
 			// maybe
 			return true;
 		}
-		boolean canConvert = conversionService.canConvert(sourceElementType, targetElementType);
-		if (canConvert) {
+		if (conversionService.canConvert(sourceElementType, targetElementType)) {
 			// yes
 			return true;
-		} else {
-			if (sourceElementType.getType().isAssignableFrom(targetElementType.getType())) {
-				// maybe;
-				return true;
-			} else {
-				// no;
-				return false;
-			}
-		}		
+		}
+		else if (sourceElementType.getType().isAssignableFrom(targetElementType.getType())) {
+			// maybe;
+			return true;
+		}
+		else {
+			// no;
+			return false;
+		}
 	}
 
 }

org.springframework.core/src/main/java/org/springframework/core/convert/support/MapToMapConverter.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -72,11 +72,11 @@ final class MapToMapConverter implements ConditionalGenericConverter {
 	// internal helpers
 
 	private boolean canConvertKey(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getMapKeyTypeDescriptor(), targetType.getMapKeyTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getMapKeyTypeDescriptor(), targetType.getMapKeyTypeDescriptor(), this.conversionService);
 	}
 	
 	private boolean canConvertValue(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType.getMapValueTypeDescriptor(), targetType.getMapValueTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType.getMapValueTypeDescriptor(), targetType.getMapValueTypeDescriptor(), this.conversionService);
 	}
 	
 	private Object convertKey(Object sourceKey, TypeDescriptor sourceType, TypeDescriptor targetType) {
@@ -93,4 +93,4 @@ final class MapToMapConverter implements ConditionalGenericConverter {
 		return this.conversionService.convert(sourceValue, sourceType.mapValueTypeDescriptor(sourceValue), targetType);
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToArrayConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,7 +44,7 @@ final class ObjectToArrayConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(), this.conversionService);
 	}
 
 	public Object convert(Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
@@ -57,4 +57,4 @@ final class ObjectToArrayConverter implements ConditionalGenericConverter {
 		return target;
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/ObjectToCollectionConverter.java

 /*
- * Copyright 2002-2010 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -46,7 +46,7 @@ final class ObjectToCollectionConverter implements ConditionalGenericConverter {
 	}
 
 	public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
-		return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(), conversionService);
+		return ConversionUtils.canConvertElements(sourceType, targetType.getElementTypeDescriptor(), this.conversionService);
 	}
 
 	@SuppressWarnings("unchecked")
@@ -56,12 +56,13 @@ final class ObjectToCollectionConverter implements ConditionalGenericConverter {
 		}
 		Collection<Object> target = CollectionFactory.createCollection(targetType.getType(), 1);
 		if (targetType.getElementTypeDescriptor() == null || targetType.getElementTypeDescriptor().isCollection()) {
-			target.add(source);			
-		} else {
+			target.add(source);
+		}
+		else {
 			Object singleElement = this.conversionService.convert(source, sourceType, targetType.getElementTypeDescriptor());
 			target.add(singleElement);
 		}
 		return target;
 	}
 
-}
\ No newline at end of file
+}

org.springframework.core/src/main/java/org/springframework/core/convert/support/StringToBooleanConverter.java

 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -48,7 +48,7 @@ final class StringToBooleanConverter implements Converter<String, Boolean> {
 	
 	public Boolean convert(String source) {
 		String value = source.trim();
-		if (value.length() == 0) {
+		if ("".equals(value)) {
 			return null;
 		}
 		value = value.toLowerCase();