org.apache.hadoop.hive.serde2.typeinfo

Class TypeInfo

java.lang.Object

org.apache.hadoop.hive.serde2.typeinfo.TypeInfo

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ListTypeInfo, MapTypeInfo, PrimitiveTypeInfo, StructTypeInfo, UnionTypeInfo

public abstract class TypeInfo
extends Object
implements Serializable

Stores information about a type. Always use the TypeInfoFactory to create new TypeInfo objects. We support 8 categories of types: 1. Primitive objects (String, Number, etc) 2. List objects (a list of objects of a single type) 3. Map objects (a map from objects of one type to objects of another type) 4. Struct objects (a list of fields with names and their own types) 5. Union objects 6. Decimal objects 7. Char objects 8. Varchar objects

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	TypeInfo()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	accept(TypeInfo other)
abstract boolean	equals(Object o)
abstract ObjectInspector.Category	getCategory() The Category of this TypeInfo.
String	getQualifiedName() String representing the qualified type name.
abstract String	getTypeName() A String representation of the TypeInfo.
abstract int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

TypeInfo

protected TypeInfo()

Method Detail

getCategory

public abstract ObjectInspector.Category getCategory()

The Category of this TypeInfo. Possible values are Primitive, List, Map, Struct and Union, which corresponds to the 5 sub-classes of TypeInfo.

getTypeName

public abstract String getTypeName()

A String representation of the TypeInfo.

getQualifiedName

public String getQualifiedName()

String representing the qualified type name. Qualified types should override this method.

Returns:

toString

public String toString()

Overrides:

toString in class Object

equals

public abstract boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public abstract int hashCode()

Overrides:

hashCode in class Object

accept

public boolean accept(TypeInfo other)