Package org.apache.druid.segment.column

Class BaseTypeSignature<Type extends TypeDescriptor>

java.lang.Object

org.apache.druid.segment.column.BaseTypeSignature<Type>

All Implemented Interfaces:

TypeSignature<Type>

Direct Known Subclasses:

ColumnType, ExpressionType

public abstract class BaseTypeSignature<Type extends TypeDescriptor>
extends Object
implements TypeSignature<Type>

Field Summary

Fields

Modifier and Type	Field	Description
protected String	complexTypeName
protected TypeSignature<Type>	elementType
protected Type	type

Constructor Summary

Constructors

Constructor	Description
BaseTypeSignature(TypeFactory typeFactory, Type type, String complexTypeName, TypeSignature<Type> elementType)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object o)
String	getComplexTypeName()	Type name of 'complex' types (ValueType.COMPLEX, ExprType.COMPLEX), which are 'registered' by their name, acting as a key to get the correct set of serialization, deserialization, and other type specific handling facilties.
TypeSignature<Type>	getElementType()	TypeSignature for the elements contained in an array type (ValueType.ARRAY, ExprType.ARRAY).
<T> NullableTypeStrategy<T>	getNullableStrategy()	A NullableTypeStrategy is a TypeStrategy which can handle reading and writing null values, at the very high cost of an additional byte per value, of which a single bit is used to store NullHandling.IS_NULL_BYTE or NullHandling.IS_NOT_NULL_BYTE as appropriate.
<T> TypeStrategy<T>	getStrategy()	A TypeStrategy provides facilities to reading and writing values to buffers, as well as basic value comparators and byte size estimation.
Type	getType()	TypeDescriptor enumeration used to handle different classes of types
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.segment.column.TypeSignature

anyOf, asTypeString, is, isArray, isNumeric, isPrimitive, isPrimitiveArray

Field Detail

type

protected final Type extends TypeDescriptor type

complexTypeName

@Nullable
protected final String complexTypeName

elementType

@Nullable
protected final TypeSignature<Type extends TypeDescriptor> elementType

Constructor Detail

BaseTypeSignature

public BaseTypeSignature(TypeFactory typeFactory,
                         Type type,
                         @Nullable
                         String complexTypeName,
                         @Nullable
                         TypeSignature<Type> elementType)

Method Detail

getType

public Type getType()

Description copied from interface: TypeSignature

TypeDescriptor enumeration used to handle different classes of types

Specified by:

getType in interface TypeSignature<Type extends TypeDescriptor>

See Also:

ValueType, ExprType

getComplexTypeName

@Nullable
public String getComplexTypeName()

Description copied from interface: TypeSignature

Type name of 'complex' types (ValueType.COMPLEX, ExprType.COMPLEX), which are 'registered' by their name, acting as a key to get the correct set of serialization, deserialization, and other type specific handling facilties. For other types, this value will be null.

Specified by:

getComplexTypeName in interface TypeSignature<Type extends TypeDescriptor>

getElementType

@Nullable
public TypeSignature<Type> getElementType()

Description copied from interface: TypeSignature

TypeSignature for the elements contained in an array type (ValueType.ARRAY, ExprType.ARRAY). For non-array types, this value will be null.

Specified by:

getElementType in interface TypeSignature<Type extends TypeDescriptor>

getStrategy

public <T> TypeStrategy<T> getStrategy()

Description copied from interface: TypeSignature

A TypeStrategy provides facilities to reading and writing values to buffers, as well as basic value comparators and byte size estimation. Use TypeSignature.getNullableStrategy() if you need to read and write values which might possibly be null and aren't handling this in a different (probably better) way.

Specified by:

getStrategy in interface TypeSignature<Type extends TypeDescriptor>

getNullableStrategy

public <T> NullableTypeStrategy<T> getNullableStrategy()

Description copied from interface: TypeSignature

A NullableTypeStrategy is a TypeStrategy which can handle reading and writing null values, at the very high cost of an additional byte per value, of which a single bit is used to store NullHandling.IS_NULL_BYTE or NullHandling.IS_NOT_NULL_BYTE as appropriate. This pattern is common among buffer aggregators, which don't have access to an external memory location for more efficient tracking of null values and must store this information inline with the accumulated value.

Specified by:

getNullableStrategy in interface TypeSignature<Type extends TypeDescriptor>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object