org.apache.drill.exec.vector.accessor.reader

Class BaseScalarReader

java.lang.Object

org.apache.drill.exec.vector.accessor.reader.AbstractScalarReader

org.apache.drill.exec.vector.accessor.reader.BaseScalarReader

All Implemented Interfaces:

ColumnReader, ReaderEvents, ScalarReader

Direct Known Subclasses:

BaseScalarReader.BaseFixedWidthReader, BaseScalarReader.BaseVarWidthReader

public abstract class BaseScalarReader
extends AbstractScalarReader

Column reader implementation that acts as the basis for the generated, vector-specific implementations. All set methods throw an exception; subclasses simply override the supported method(s).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BaseScalarReader.BaseFixedWidthReader
static class	BaseScalarReader.BaseVarWidthReader
static interface	BaseScalarReader.BufferAccessor Provide access to the DrillBuf for the data vector.

Nested classes/interfaces inherited from class org.apache.drill.exec.vector.accessor.reader.AbstractScalarReader

AbstractScalarReader.NullReader, AbstractScalarReader.ScalarObjectReader

Field Summary

Fields

Modifier and Type	Field and Description
protected BaseScalarReader.BufferAccessor	bufferAccessor
protected ColumnMetadata	schema
protected VectorAccessor	vectorAccessor

Fields inherited from class org.apache.drill.exec.vector.accessor.reader.AbstractScalarReader

nullStateReader, vectorIndex

Constructor Summary

Constructors

Constructor and Description
BaseScalarReader()

Method Summary

Modifier and Type	Method and Description
void	bindBuffer()
void	bindIndex(ColumnReaderIndex rowIndex)
void	bindVector(ColumnMetadata schema, VectorAccessor va)
DrillBuf	buffer()
protected BaseScalarReader.BufferAccessor	bufferAccessor(VectorAccessor va)
static AbstractScalarReader.ScalarObjectReader	buildOptional(ColumnMetadata schema, VectorAccessor va, BaseScalarReader reader)
static AbstractScalarReader.ScalarObjectReader	buildRequired(ColumnMetadata schema, VectorAccessor va, BaseScalarReader reader)
ColumnMetadata	schema()

Methods inherited from class org.apache.drill.exec.vector.accessor.reader.AbstractScalarReader

bindNullState, conversionError, extendedType, getAsString, getBoolean, getBytes, getDate, getDecimal, getDouble, getFloat, getInt, getLong, getObject, getPeriod, getString, getTime, getTimestamp, getValue, isNull, nullReader, nullStateReader, reposition, type

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.exec.vector.accessor.ScalarReader

valueType

Field Detail

schema

protected ColumnMetadata schema

vectorAccessor

protected VectorAccessor vectorAccessor

bufferAccessor

protected BaseScalarReader.BufferAccessor bufferAccessor

Constructor Detail

BaseScalarReader

public BaseScalarReader()

Method Detail

buildOptional

public static AbstractScalarReader.ScalarObjectReader buildOptional(ColumnMetadata schema,
                                                                    VectorAccessor va,
                                                                    BaseScalarReader reader)

buildRequired

public static AbstractScalarReader.ScalarObjectReader buildRequired(ColumnMetadata schema,
                                                                    VectorAccessor va,
                                                                    BaseScalarReader reader)

bindVector

public void bindVector(ColumnMetadata schema,
                       VectorAccessor va)

bufferAccessor

protected BaseScalarReader.BufferAccessor bufferAccessor(VectorAccessor va)

bindIndex

public void bindIndex(ColumnReaderIndex rowIndex)

Specified by:

bindIndex in interface ReaderEvents

Overrides:

bindIndex in class AbstractScalarReader

schema

public ColumnMetadata schema()

bindBuffer

public void bindBuffer()

buffer

public final DrillBuf buffer()