org.apache.hadoop.hive.serde2.objectinspector
Class UnionStructObjectInspector

java.lang.Object
  extended by org.apache.hadoop.hive.serde2.objectinspector.UnionStructObjectInspector
All Implemented Interfaces:
ObjectInspector, StructObjectInspector

public class UnionStructObjectInspector
extends Object
implements StructObjectInspector

UnionStructObjectInspector unions several struct data into a single struct. Basically, the fields of these structs are put together sequentially into a single struct. The object that can be acceptable by this ObjectInspector is a List of objects, each of which can be inspected by the ObjectInspector provided in the ctor of UnionStructObjectInspector. Always use the ObjectInspectorFactory to create new ObjectInspector objects, instead of directly creating an instance of this class.


Nested Class Summary
static class UnionStructObjectInspector.MyField
           
 
Nested classes/interfaces inherited from interface org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector
ObjectInspector.Category
 
Constructor Summary
protected UnionStructObjectInspector(List<StructObjectInspector> unionObjectInspectors)
           
 
Method Summary
 List<? extends StructField> getAllStructFieldRefs()
          Returns all the fields.
 ObjectInspector.Category getCategory()
          An ObjectInspector must inherit from one of the following interfaces if getCategory() returns: PRIMITIVE: PrimitiveObjectInspector LIST: ListObjectInspector MAP: MapObjectInspector STRUCT: StructObjectInspector
 Object getStructFieldData(Object data, StructField fieldRef)
          returns null for data = null.
 StructField getStructFieldRef(String fieldName)
          Look up a field.
 List<Object> getStructFieldsDataAsList(Object data)
          returns null for data = null.
 String getTypeName()
          Returns the name of the data type that is inspected by this ObjectInspector.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

UnionStructObjectInspector

protected UnionStructObjectInspector(List<StructObjectInspector> unionObjectInspectors)
Method Detail

getCategory

public final ObjectInspector.Category getCategory()
Description copied from interface: ObjectInspector
An ObjectInspector must inherit from one of the following interfaces if getCategory() returns: PRIMITIVE: PrimitiveObjectInspector LIST: ListObjectInspector MAP: MapObjectInspector STRUCT: StructObjectInspector

Specified by:
getCategory in interface ObjectInspector

getTypeName

public String getTypeName()
Description copied from interface: ObjectInspector
Returns the name of the data type that is inspected by this ObjectInspector. This is used to display the type information to the user. For primitive types, the type name is standardized. For other types, the type name can be something like "list", "map", java class names, or user-defined type names similar to typedef.

Specified by:
getTypeName in interface ObjectInspector

getStructFieldRef

public StructField getStructFieldRef(String fieldName)
Description copied from interface: StructObjectInspector
Look up a field.

Specified by:
getStructFieldRef in interface StructObjectInspector

getAllStructFieldRefs

public List<? extends StructField> getAllStructFieldRefs()
Description copied from interface: StructObjectInspector
Returns all the fields.

Specified by:
getAllStructFieldRefs in interface StructObjectInspector

getStructFieldData

public Object getStructFieldData(Object data,
                                 StructField fieldRef)
Description copied from interface: StructObjectInspector
returns null for data = null.

Specified by:
getStructFieldData in interface StructObjectInspector

getStructFieldsDataAsList

public List<Object> getStructFieldsDataAsList(Object data)
Description copied from interface: StructObjectInspector
returns null for data = null.

Specified by:
getStructFieldsDataAsList in interface StructObjectInspector


Copyright © 2009 The Apache Software Foundation