org.apache.lens.server.api.query
Class AbstractQueryContext

java.lang.Object
  org.apache.lens.server.api.query.AbstractQueryContext

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

ExplainQueryContext, PreparedQueryContext, QueryContext

public abstract class AbstractQueryContext
extends Object
implements Serializable

See Also:

Serialized Form

Field Summary

static org.apache.commons.logging.Log

LOG The Constant LOG

Method Summary

void	estimateCostForDrivers() Estimate cost for each driver and set in context
org.apache.hadoop.conf.Configuration	getDriverConf(LensDriver driver) Get driver conf
String	getDriverQuery(LensDriver driver) Get driver query
QueryCost	getDriverQueryCost(LensDriver driver) Get query cost for the driver
Exception	getDriverRewriteError(LensDriver driver) Get exception during rewrite.
LensDriver	getSelectedDriver() Wrapper method for convenience on driver context
org.apache.hadoop.conf.Configuration	getSelectedDriverConf() Wrapper method for convenience on driver context
String	getSelectedDriverQuery() Wrapper method for convenience on driver context
QueryCost	getSelectedDriverQueryCost() Get selected driver's cost
DriverQueryPlan	getSelectedDriverQueryPlan() Wrapper method for convenience on driver context
void	setDriverQueries(Map<LensDriver,String> driverQueries) Set driver queries
void	setDriverRewriteError(LensDriver driver, Exception exp) Set exception during rewrite.
void	setSelectedDriver(LensDriver driver) Wrapper method for convenience on driver context
void	setSelectedDriverQuery(String driverQuery) Sets the selected driver query for persistence and also in the driver context

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.apache.commons.logging.Log LOG

The Constant LOG

Method Detail

setDriverQueries

public void setDriverQueries(Map<LensDriver,String> driverQueries)
                      throws LensException

Set driver queries

Parameters:

driverQueries - Map of LensDriver to driver's query

Throws:

LensException

estimateCostForDrivers

public void estimateCostForDrivers()
                            throws LensException

Estimate cost for each driver and set in context

Throws:

LensException

getSelectedDriverQuery

public String getSelectedDriverQuery()

Wrapper method for convenience on driver context

Returns:

the selected driver's query

getDriverQuery

public String getDriverQuery(LensDriver driver)

Get driver query

Parameters:

driver -

Returns:

query

getDriverConf

public org.apache.hadoop.conf.Configuration getDriverConf(LensDriver driver)

Get driver conf

Parameters:

driver -

Returns:

Configuration

getDriverQueryCost

public QueryCost getDriverQueryCost(LensDriver driver)

Get query cost for the driver

Parameters:

driver -

Returns:

QueryCost

getSelectedDriverConf

public org.apache.hadoop.conf.Configuration getSelectedDriverConf()

Wrapper method for convenience on driver context

Returns:

the selected driver's conf

setSelectedDriverQuery

public void setSelectedDriverQuery(String driverQuery)

Sets the selected driver query for persistence and also in the driver context

Parameters:

driverQuery -

setSelectedDriver

public void setSelectedDriver(LensDriver driver)

Wrapper method for convenience on driver context

Parameters:

driver - Lens driver

getSelectedDriver

public LensDriver getSelectedDriver()

Wrapper method for convenience on driver context

Returns:

the selected driver

getSelectedDriverQueryPlan

public DriverQueryPlan getSelectedDriverQueryPlan()
                                           throws LensException

Wrapper method for convenience on driver context

Returns:

the selected driver

Throws:

LensException

getSelectedDriverQueryCost

public QueryCost getSelectedDriverQueryCost()
                                     throws LensException

Get selected driver's cost

Returns:

QueryCost

Throws:

LensException

setDriverRewriteError

public void setDriverRewriteError(LensDriver driver,
                                  Exception exp)

Set exception during rewrite.

Parameters:

driver -

exp -

getDriverRewriteError

public Exception getDriverRewriteError(LensDriver driver)

Get exception during rewrite.

Parameters:

driver -

Returns:

exp