com.mapr.ojai.store.impl

Class ValueExtractor

java.lang.Object

com.mapr.ojai.store.impl.ValueExtractor

Direct Known Subclasses:

ValueExtractors.BigIntValueExtractor, ValueExtractors.BooleanValueExtractor, ValueExtractors.ByteValueExtractor, ValueExtractors.DateValueExtractor, ValueExtractors.DoubleValueExtractor, ValueExtractors.FloatValueExtractor, ValueExtractors.IntValueExtractor, ValueExtractors.MapValueExtractor, ValueExtractors.NullableBigIntValueExtractor, ValueExtractors.NullableBooleanValueExtractor, ValueExtractors.NullableByteValueExtractor, ValueExtractors.NullableDateValueExtractor, ValueExtractors.NullableDoubleValueExtractor, ValueExtractors.NullableFloatValueExtractor, ValueExtractors.NullableIntValueExtractor, ValueExtractors.NullableShortValueExtractor, ValueExtractors.NullableTimestampValueExtractor, ValueExtractors.NullableTimeValueExtractor, ValueExtractors.NullableVar16CharValueExtractor, ValueExtractors.NullableVarBinaryValueExtractor, ValueExtractors.NullableVarCharValueExtractor, ValueExtractors.RepeatedScalarValueExtractor, ValueExtractors.ShortValueExtractor, ValueExtractors.TimestampValueExtractor, ValueExtractors.TimeValueExtractor, ValueExtractors.Var16CharValueExtractor, ValueExtractors.VarBinaryValueExtractor, ValueExtractors.VarCharValueExtractor

public abstract class ValueExtractor
extends java.lang.Object

A ValueExtractor is a proxy for a ValueVector's Accessor after we have determined the type, nullability, and repeatability (array-ness) of the vector. This is a performance optimization that avoids finding the type specific implementation for each record within a ValueVector. The ValueExtractors class has concrete implementations of this abstract class for all the value vector type and mode combinations.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.ojai.FieldPath	fieldPath
int	valueCount

Constructor Summary

Constructors

Constructor and Description
ValueExtractor(java.lang.String fieldName, int valueCount) Constructor.

Method Summary

Modifier and Type	Method and Description
abstract void	extract(com.mapr.db.rowcol.DBDocumentImpl doc, int iRow) Extract the specified value from the ValueVector, and add it to the document with the fieldName specified at construction time.

Methods inherited from class java.lang.Object

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

Field Detail

fieldPath

protected final org.ojai.FieldPath fieldPath

valueCount

public final int valueCount

Constructor Detail

ValueExtractor

public ValueExtractor(java.lang.String fieldName,
                      int valueCount)

Constructor.

Parameters:

fieldName - the name of the field

valueCount - the number of values the ValueVector has

Method Detail

extract

public abstract void extract(com.mapr.db.rowcol.DBDocumentImpl doc,
                             int iRow)

Extract the specified value from the ValueVector, and add it to the document with the fieldName specified at construction time. If the value is NULL (which must be checked for a NullableValueVector), this should do nothing.

Parameters:

doc - the document to add the field-value pair to

iRow - the index into the value vector; note this has already been checked against valueCount, so there's no need to check it here.