com.yahoo.bard.webservice.data.metric.mappers

Class ResultSetMapper

java.lang.Object

com.yahoo.bard.webservice.data.metric.mappers.ResultSetMapper

Direct Known Subclasses:

DateTimeSortMapper, NoOpResultSetMapper, PaginationMapper, PartialDataResultSetMapper, RowNumMapper, SketchRoundUpMapper, TopNResultSetMapper

public abstract class ResultSetMapper
extends Object

ResultSetMapper is an abstract class for walking a result set.

Constructor Summary

Constructors

Constructor and Description
ResultSetMapper()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) Since a ResultSetMapper has no state associated with it, we consider two ResultSetMappers to be the same iff they are of the same class.
int	hashCode()
protected abstract Result	map(Result result, ResultSetSchema schema) Returns a transformed result row, or null if the row is removed.
ResultSet	map(ResultSet resultSet) Take a complete result set and replace it with one altered according to the rules of the concrete mapper.
protected abstract ResultSetSchema	map(ResultSetSchema schema) Returns a transformed schema.

Methods inherited from class java.lang.Object

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

Constructor Detail

ResultSetMapper

public ResultSetMapper()

Method Detail

map

public ResultSet map(ResultSet resultSet)

Take a complete result set and replace it with one altered according to the rules of the concrete mapper.

Parameters:

resultSet - The unmapped result set

Returns:

The mapped result set

map

protected abstract Result map(Result result,
                              ResultSetSchema schema)

Returns a transformed result row, or null if the row is removed.

Parameters:

result - The result row being transformed

schema - The schema for that result

Returns:

The result row, a modified copy, or null (if row is eliminated)

map

protected abstract ResultSetSchema map(ResultSetSchema schema)

Returns a transformed schema.

Parameters:

schema - The schema being mapped

Returns:

The same schema or a new (altered) one

equals

public boolean equals(Object o)

Since a ResultSetMapper has no state associated with it, we consider two ResultSetMappers to be the same iff they are of the same class.

Overrides:

equals in class Object

Parameters:

o - The object this is being compared to

Returns:

true if the objects have the same class, false otherwise.

hashCode

public int hashCode()

Overrides:

hashCode in class Object