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fixed detection of element type in case of nested collections (SPR-7569)

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This commit is contained in:
Juergen Hoeller
2010-10-10 21:09:43 +00:00
parent 6b3c299a50
commit ebe8052d55
2 changed files with 88 additions and 41 deletions
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54
org.springframework.core/src/main/java/org/springframework/core/convert/TypeDescriptor.java
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@@ -76,6 +76,8 @@ public class TypeDescriptor {
private Field field;
private int fieldNestingLevel = 1;
private Object value;
private TypeDescriptor elementType;
@@ -133,6 +135,19 @@ public class TypeDescriptor {
this.type = type;
}
/**
* Create a new type descriptor for a field.
* Use this constructor when a target conversion point originates from a field.
* @param field the field to wrap
* @param type the specific type to expose (may be an array/collection element)
*/
private TypeDescriptor(Field field, int nestingLevel, Class<?> type) {
Assert.notNull(field, "Field must not be null");
this.field = field;
this.fieldNestingLevel = nestingLevel;
this.type = type;
}
/**
* Internal constructor for a NULL descriptor.
*/
@@ -397,10 +412,12 @@ public class TypeDescriptor {
return TypeDescriptor.UNKNOWN;
}
else if (this.methodParameter != null) {
return new TypeDescriptor(this.methodParameter, elementType);
MethodParameter nested = new MethodParameter(this.methodParameter);
nested.increaseNestingLevel();
return new TypeDescriptor(nested, elementType);
}
else if (this.field != null) {
return new TypeDescriptor(this.field, elementType);
return new TypeDescriptor(this.field, this.fieldNestingLevel + 1, elementType);
}
else {
return TypeDescriptor.valueOf(elementType);
@@ -434,7 +451,7 @@ public class TypeDescriptor {
}
/**
* A textual representation of the type descriptor (eg. Map<String,Foo>) for use in messages
* A textual representation of the type descriptor (eg. Map<String,Foo>) for use in messages.
*/
public String asString() {
return toString();
@@ -442,28 +459,22 @@ public class TypeDescriptor {
public String toString() {
if (this == TypeDescriptor.NULL) {
return "[TypeDescriptor.NULL]";
return "null";
}
else {
StringBuilder builder = new StringBuilder();
builder.append("[TypeDescriptor ");
Annotation[] anns = getAnnotations();
for (Annotation ann : anns) {
builder.append("@").append(ann.annotationType().getName()).append(' ');
}
builder.append(ClassUtils.getQualifiedName(getType()));
if (isMap()) {
Class<?> mapKeyType = getMapKeyType();
Class<?> valueKeyType = getMapValueType();
builder.append("<").append(mapKeyType != null ? ClassUtils.getQualifiedName(mapKeyType) : "?");
builder.append(", ").append(valueKeyType != null ? ClassUtils.getQualifiedName(valueKeyType) : "?");
builder.append(">");
builder.append("<").append(getMapKeyTypeDescriptor());
builder.append(", ").append(getMapValueTypeDescriptor()).append(">");
}
else if (isCollection()) {
Class<?> elementType = getElementType();
builder.append("<").append(elementType != null ? ClassUtils.getQualifiedName(elementType) : "?").append(">");
builder.append("<").append(getElementTypeDescriptor()).append(">");
}
builder.append("]");
return builder.toString();
}
}
@@ -486,7 +497,7 @@ public class TypeDescriptor {
@SuppressWarnings("unchecked")
private Class<?> resolveCollectionElementType() {
if (this.field != null) {
return GenericCollectionTypeResolver.getCollectionFieldType(this.field);
return GenericCollectionTypeResolver.getCollectionFieldType(this.field, this.fieldNestingLevel);
}
else if (this.methodParameter != null) {
return GenericCollectionTypeResolver.getCollectionParameterType(this.methodParameter);
@@ -497,7 +508,10 @@ public class TypeDescriptor {
return elementType;
}
}
return (this.type != null ? GenericCollectionTypeResolver.getCollectionType((Class<? extends Collection>) this.type) : null);
else if (this.type != null) {
return GenericCollectionTypeResolver.getCollectionType((Class<? extends Collection>) this.type);
}
return null;
}
@SuppressWarnings("unchecked")
@@ -514,7 +528,10 @@ public class TypeDescriptor {
return keyType;
}
}
return (this.type != null && isMap() ? GenericCollectionTypeResolver.getMapKeyType((Class<? extends Map>) this.type) : null);
else if (this.type != null && isMap()) {
return GenericCollectionTypeResolver.getMapKeyType((Class<? extends Map>) this.type);
}
return null;
}
@SuppressWarnings("unchecked")
@@ -531,7 +548,10 @@ public class TypeDescriptor {
return valueType;
}
}
return (isMap() && this.type != null ? GenericCollectionTypeResolver.getMapValueType((Class<? extends Map>) this.type) : null);
else if (this.type != null && isMap()) {
return GenericCollectionTypeResolver.getMapValueType((Class<? extends Map>) this.type);
}
return null;
}
private Annotation[] resolveAnnotations() {