/**
* Returns the standard object inspector that can be used to translate an
* object of that typeInfo to a standard object type.
*/
public static ObjectInspector getStandardJavaObjectInspectorFromTypeInfo(
TypeInfo typeInfo)
{
ObjectInspector result = cachedStandardJavaObjectInspector.get(typeInfo);
if (result == null)
{
switch (typeInfo.getCategory())
{
case ObjectInspectorCategory.PRIMITIVE:
{
// NOTE: we use JavaPrimitiveObjectInspector instead of
// StandardPrimitiveObjectInspector
result = PrimitiveObjectInspectorFactory
.getPrimitiveJavaObjectInspector((PrimitiveTypeInfo)typeInfo);
break;
}
case ObjectInspectorCategory.LIST:
{
ObjectInspector elementObjectInspector =
getStandardJavaObjectInspectorFromTypeInfo(((ListTypeInfo)typeInfo)
.getListElementTypeInfo());
result = ObjectInspectorFactory
.getStandardListObjectInspector(elementObjectInspector);
break;
}
case ObjectInspectorCategory.MAP:
{
MapTypeInfo mapTypeInfo = (MapTypeInfo)typeInfo;
ObjectInspector keyObjectInspector = getStandardJavaObjectInspectorFromTypeInfo(mapTypeInfo
.getMapKeyTypeInfo());
ObjectInspector valueObjectInspector =
getStandardJavaObjectInspectorFromTypeInfo(mapTypeInfo.getMapValueTypeInfo());
result = ObjectInspectorFactory.getStandardMapObjectInspector(
keyObjectInspector, valueObjectInspector);
break;
}
case ObjectInspectorCategory.STRUCT:
{
StructTypeInfo strucTypeInfo = (StructTypeInfo)typeInfo;
List <String> fieldNames = strucTypeInfo.getAllStructFieldNames();
List <TypeInfo> fieldTypeInfos = strucTypeInfo
.getAllStructFieldTypeInfos();
List <ObjectInspector> fieldObjectInspectors = new List <ObjectInspector>(
fieldTypeInfos.Count);
for (int i = 0; i < fieldTypeInfos.Count; i++)
{
fieldObjectInspectors
.Add(getStandardJavaObjectInspectorFromTypeInfo(fieldTypeInfos[i]));
}
result = ObjectInspectorFactory.getStandardStructObjectInspector(
fieldNames, fieldObjectInspectors);
break;
}
case ObjectInspectorCategory.UNION:
{
UnionTypeInfo unionTypeInfo = (UnionTypeInfo)typeInfo;
List <TypeInfo> objectTypeInfos = unionTypeInfo
.getAllUnionObjectTypeInfos();
List <ObjectInspector> fieldObjectInspectors =
new List <ObjectInspector>(objectTypeInfos.Count);
for (int i = 0; i < objectTypeInfos.Count; i++)
{
fieldObjectInspectors
.Add(getStandardJavaObjectInspectorFromTypeInfo(objectTypeInfos[i]));
}
result = ObjectInspectorFactory.getStandardUnionObjectInspector(
fieldObjectInspectors);
break;
}
default:
{
result = null;
break;
}
}
ObjectInspector prev =
cachedStandardJavaObjectInspector.putIfAbsent(typeInfo, result);
if (prev != null)
{
result = prev;
}
}
return(result);
}
/**
* Return the extended TypeInfo from a Java type. By extended TypeInfo, we
* allow unknownType for java.lang.Object.
*
* @param t
* The Java type.
* @param m
* The method, only used for generating error messages.
*/
private static TypeInfo getExtendedTypeInfoFromJavaType(Type t, MethodInfo m)
{
if (t == typeof(object))
{
return(TypeInfoFactory.unknownTypeInfo);
}
if (t.IsGenericType)
{
Type bt = t.GetGenericTypeDefinition();
Type[] pt = t.GenericTypeArguments;
// List?
if (bt == typeof(List <>))
{
return(TypeInfoFactory.getListTypeInfo(getExtendedTypeInfoFromJavaType(
pt[0], m)));
}
// Map?
if (bt == typeof(Dictionary <,>))
{
return(TypeInfoFactory.getMapTypeInfo(
getExtendedTypeInfoFromJavaType(pt[0], m),
getExtendedTypeInfoFromJavaType(pt[1], m)));
}
}
// Java Primitive Type?
if (PrimitiveObjectInspectorUtils.isPrimitiveJavaType(t))
{
return(TypeInfoUtils
.getTypeInfoFromObjectInspector(PrimitiveObjectInspectorFactory
.getPrimitiveJavaObjectInspector(PrimitiveObjectInspectorUtils
.getTypeEntryFromPrimitiveJavaType(t).primitiveCategory)));
}
// Java Primitive Class?
if (PrimitiveObjectInspectorUtils.isPrimitiveJavaClass(t))
{
return(TypeInfoUtils
.getTypeInfoFromObjectInspector(PrimitiveObjectInspectorFactory
.getPrimitiveJavaObjectInspector(PrimitiveObjectInspectorUtils
.getTypeEntryFromPrimitiveJavaClass(t).primitiveCategory)));
}
// Primitive Writable class?
if (PrimitiveObjectInspectorUtils.isPrimitiveWritableClass(t))
{
return(TypeInfoUtils
.getTypeInfoFromObjectInspector(PrimitiveObjectInspectorFactory
.getPrimitiveWritableObjectInspector(PrimitiveObjectInspectorUtils
.getTypeEntryFromPrimitiveWritableClass(t).primitiveCategory)));
}
// Must be a struct
FieldInfo[] fields = ObjectInspectorUtils.getDeclaredNonStaticFields(t);
List <string> fieldNames = new List <string>(fields.Length);
List <TypeInfo> fieldTypeInfos = new List <TypeInfo>(fields.Length);
foreach (FieldInfo field in fields)
{
fieldNames.Add(field.Name);
fieldTypeInfos.Add(getExtendedTypeInfoFromJavaType(
field.FieldType, m));
}
return(TypeInfoFactory.getStructTypeInfo(fieldNames, fieldTypeInfos));
}
