org.apache.hadoop.hive.serde2.objectinspector

Class ReflectionStructObjectInspector

java.lang.Object

org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector

org.apache.hadoop.hive.serde2.objectinspector.SettableStructObjectInspector

org.apache.hadoop.hive.serde2.objectinspector.ReflectionStructObjectInspector

All Implemented Interfaces:

Cloneable, ObjectInspector

Direct Known Subclasses:

ThriftUnionObjectInspector

public class ReflectionStructObjectInspector
extends SettableStructObjectInspector

ReflectionStructObjectInspector works on struct data that is stored as a native Java object. It will drill down into the Java class to get the fields and construct ObjectInspectors for the fields, if they are not specified. Always use the ObjectInspectorFactory to create new ObjectInspector objects, instead of directly creating an instance of this class.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ReflectionStructObjectInspector.MyField MyField.

Nested classes/interfaces inherited from interface org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector

ObjectInspector.Category

Method Summary

Methods

Modifier and Type	Method and Description
Object	create() Create a struct which is not null, but all its fields are null.
protected List<? extends ObjectInspector>	extractFieldObjectInspectors(Class<?> clazz, ObjectInspectorFactory.ObjectInspectorOptions options)
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.
protected void	init(Class<?> objectClass, ObjectInspectorFactory.ObjectInspectorOptions options) This method is only intended to be used by Utilities class in this package.
Object	setStructFieldData(Object struct, StructField field, Object fieldValue) Modify the value of a field.
boolean	shouldIgnoreField(String name)
protected void	verifyObjectClassType(Class<?> objectClass)

Methods inherited from class org.apache.hadoop.hive.serde2.objectinspector.SettableStructObjectInspector

isSettable

Methods inherited from class org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

getCategory

public 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.

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.

init

protected void init(Class<?> objectClass,
        ObjectInspectorFactory.ObjectInspectorOptions options)

This method is only intended to be used by Utilities class in this package. The reason that this method is not recursive by itself is because we want to allow recursive types.

shouldIgnoreField

public boolean shouldIgnoreField(String name)

getStructFieldRef

public StructField getStructFieldRef(String fieldName)

Description copied from class: StructObjectInspector

Look up a field.

Specified by:

getStructFieldRef in class StructObjectInspector

getAllStructFieldRefs

public List<? extends StructField> getAllStructFieldRefs()

Description copied from class: StructObjectInspector

Returns all the fields.

Specified by:

getAllStructFieldRefs in class StructObjectInspector

getStructFieldData

public Object getStructFieldData(Object data,
                        StructField fieldRef)

Description copied from class: StructObjectInspector

returns null for data = null.

Specified by:

getStructFieldData in class StructObjectInspector

getStructFieldsDataAsList

public List<Object> getStructFieldsDataAsList(Object data)

Description copied from class: StructObjectInspector

returns null for data = null.

Specified by:

getStructFieldsDataAsList in class StructObjectInspector

create

public Object create()

Description copied from class: SettableStructObjectInspector

Create a struct which is not null, but all its fields are null.

Specified by:

create in class SettableStructObjectInspector

setStructFieldData

public Object setStructFieldData(Object struct,
                        StructField field,
                        Object fieldValue)

Description copied from class: SettableStructObjectInspector

Modify the value of a field. Returns the struct.

Specified by:

setStructFieldData in class SettableStructObjectInspector

extractFieldObjectInspectors

protected List<? extends ObjectInspector> extractFieldObjectInspectors(Class<?> clazz,
                                                           ObjectInspectorFactory.ObjectInspectorOptions options)

verifyObjectClassType

protected void verifyObjectClassType(Class<?> objectClass)