Package org.apache.drill.exec.vector.accessor.writer

Class AbstractScalarWriter

java.lang.Object

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter

All Implemented Interfaces:

ColumnWriter, ScalarWriter, ValueWriter

Direct Known Subclasses:

AbstractScalarWriterImpl

public abstract class AbstractScalarWriter
extends Object
implements ScalarWriter

Base class for concrete scalar column writers including actual vector writers, and wrappers for nullable types.

Constructor Summary

Constructors

Constructor	Description
AbstractScalarWriter()

Method Summary

Modifier and Type	Method	Description
void	bindListener(WriterEvents.ColumnWriterListener listener)
protected UnsupportedConversionError	conversionError(String javaType)
ValueType	extendedType()	The extended type of the value, describes the secondary type for DATE, TIME and TIMESTAMP for which the value type is int or long.
void	setObject(Object value)	Generic technique to write data as a generic Java object.
String	toString()

Methods inherited from class java.lang.Object

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

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

copy, isProjected, nullable, schema, setNull, type

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

setDefaultValue, valueType

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

appendBytes, setBoolean, setBytes, setDate, setDecimal, setDouble, setFloat, setInt, setLong, setNull, setPeriod, setString, setTime, setTimestamp, setValue

Constructor Details

AbstractScalarWriter

public AbstractScalarWriter()

Method Details

extendedType

public ValueType extendedType()

Description copied from interface: ScalarWriter

The extended type of the value, describes the secondary type for DATE, TIME and TIMESTAMP for which the value type is int or long.

Specified by:

extendedType in interface ScalarWriter

setObject

public void setObject(Object value)

Description copied from interface: ColumnWriter

Generic technique to write data as a generic Java object. The type of the object must match the target writer. Primarily for testing.

• Scalar: The type of the Java object must match the type of the target vector. String or byte[] can be used for Varchar vectors.
• Array: Write the array given an array of values. The object must be a Java array. The type of the array must match the type of element in the repeated vector. That is, if the vector is a Repeated Int, provide an int[] array.
• Tuple (map or row): The Java object must be an array of objects in which the members of the array have a 1:1 correspondence with the members of the tuple in the order defined by the writer metadata. That is, if the map is (Int, Varchar), provide a Object[] array like this: {10, "fred"}.
• Union: Uses the Java object type to determine the type of the backing vector. Creates a vector of the required type if needed.

Specified by:

setObject in interface ColumnWriter

Parameters:

value - value to write to the vector. The Java type of the object indicates the Drill storage type

conversionError

protected UnsupportedConversionError conversionError(String javaType)

bindListener

public void bindListener(WriterEvents.ColumnWriterListener listener)

toString

public String toString()

Overrides:

toString in class Object