org.eigenbase.oj.rex
Class OJRexImplementorTableImpl

java.lang.Object
  org.eigenbase.oj.rex.OJRexImplementorTableImpl

All Implemented Interfaces:

OJRexImplementorTable

Direct Known Subclasses:

FarragoOJRexImplementorTable

public class OJRexImplementorTableImpl
extends Object
implements OJRexImplementorTable

OJRexImplementorTableImpl is a default implementation of OJRexImplementorTable, containing implementors for standard operators, functions, and aggregates. Say that three times fast.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/oj/rex/OJRexImplementorTableImpl.java#21 $

Author:

John V. Sichi

Nested Class Summary

static class	OJRexImplementorTableImpl.OJBasicAggImplementor
static class	OJRexImplementorTableImpl.OJCountAggImplementor
static class	OJRexImplementorTableImpl.OJMinMaxAggImplementor
static class	OJRexImplementorTableImpl.OJSumAggImplementor Sum is an aggregator which returns the sum of the values which go into it.

Field Summary

private Map<SqlAggFunction,OJRexImplementorTableImpl.OJSumAggImplementor>	aggImplementorMap
private static String	holderClassName
private Map<SqlOperator,OJRexImplementor>	implementorMap
private static OJRexImplementorTableImpl	instance

Constructor Summary

protected

OJRexImplementorTableImpl() Creates an empty table.

Method Summary

OJAggImplementor	get(Aggregation agg) Retrieves the implementor of an aggregate, or null if there is no implementor registered.
OJRexImplementor	get(SqlOperator op) Retrieves the implementor of an operator, or null if there is no implementor registered.
protected void	initStandard(SqlStdOperatorTable opTab) Registers implementations for the standard set of functions and operators.
static OJRexImplementorTable	instance() Creates a table and initializes it with implementations of all of the standard SQL functions and operators.
protected void	registerBinaryOperator(SqlBinaryOperator op, int ojBinaryExpressionOrdinal)
void	registerOperator(SqlOperator op, OJRexImplementor implementor)
protected void	registerUnaryOperator(SqlPrefixOperator op, int ojUnaryExpressionOrdinal)

Methods inherited from class java.lang.Object

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

Field Detail

instance

private static OJRexImplementorTableImpl instance

holderClassName

private static final String holderClassName

See Also:

Constant Field Values

implementorMap

private final Map<SqlOperator,OJRexImplementor> implementorMap

aggImplementorMap

private final Map<SqlAggFunction,OJRexImplementorTableImpl.OJSumAggImplementor> aggImplementorMap

Constructor Detail

OJRexImplementorTableImpl

protected OJRexImplementorTableImpl()

Creates an empty table.

You probably want to call the public method instance instead.

Method Detail

instance

public static OJRexImplementorTable instance()

Creates a table and initializes it with implementations of all of the standard SQL functions and operators.

get

public OJRexImplementor get(SqlOperator op)

Description copied from interface: OJRexImplementorTable

Retrieves the implementor of an operator, or null if there is no implementor registered.

Specified by:

get in interface OJRexImplementorTable

get

public OJAggImplementor get(Aggregation agg)

Description copied from interface: OJRexImplementorTable

Retrieves the implementor of an aggregate, or null if there is no implementor registered.

Specified by:

get in interface OJRexImplementorTable

initStandard

protected void initStandard(SqlStdOperatorTable opTab)

Registers implementations for the standard set of functions and operators.

registerOperator

public void registerOperator(SqlOperator op,
                             OJRexImplementor implementor)

registerBinaryOperator

protected void registerBinaryOperator(SqlBinaryOperator op,
                                      int ojBinaryExpressionOrdinal)

registerUnaryOperator

protected void registerUnaryOperator(SqlPrefixOperator op,
                                     int ojUnaryExpressionOrdinal)