org.eigenbase.sql2rel
Class ReflectiveConvertletTable

java.lang.Object
  org.eigenbase.sql2rel.ReflectiveConvertletTable

All Implemented Interfaces:

SqlRexConvertletTable

Direct Known Subclasses:

StandardConvertletTable

public class ReflectiveConvertletTable
extends Object
implements SqlRexConvertletTable

Implementation of SqlRexConvertletTable which uses reflection to call any method of the form public RexNode convertXxx(ConvertletContext, SqlNode) or public RexNode convertXxx(ConvertletContext, SqlOperator, SqlCall).

Since:

2005/8/3

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql2rel/ReflectiveConvertletTable.java#8 $

Author:

jhyde

Field Summary

private Map<Object,Object>

map

Constructor Summary

ReflectiveConvertletTable()

Method Summary

protected void	addAlias(SqlOperator alias, SqlOperator target) Registers that one operator is an alias for another.
SqlRexConvertlet	get(SqlCall call) Returns the convertlet applicable to a given expression.
private void	registerNodeTypeMethod(Method method) Registers method if it: a.
protected void	registerOp(SqlOperator op, SqlRexConvertlet convertlet) Registers a convertlet for a given operator instance
private void	registerOpTypeMethod(Method method) Registers method if it: a.

Methods inherited from class java.lang.Object

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

Field Detail

map

private final Map<Object,Object> map

Constructor Detail

ReflectiveConvertletTable

public ReflectiveConvertletTable()

Method Detail

registerNodeTypeMethod

private void registerNodeTypeMethod(Method method)

Registers method if it: a. is public, and b. is named "convertXxx", and c. has a return type of "RexNode" or a subtype d. has a 2 parameters with types ConvertletContext and SqlNode (or a subtype) respectively.

registerOpTypeMethod

private void registerOpTypeMethod(Method method)

Registers method if it: a. is public, and b. is named "convertXxx", and c. has a return type of "RexNode" or a subtype d. has a 3 parameters with types: ConvertletContext; SqlOperator (or a subtype), SqlCall (or a subtype).

get

public SqlRexConvertlet get(SqlCall call)

Description copied from interface: SqlRexConvertletTable

Returns the convertlet applicable to a given expression.

Specified by:

get in interface SqlRexConvertletTable

registerOp

protected void registerOp(SqlOperator op,
                          SqlRexConvertlet convertlet)

Registers a convertlet for a given operator instance

Parameters:

op - Operator instance, say SqlStdOperatorTable.minusOperator

convertlet - Convertlet

addAlias

protected void addAlias(SqlOperator alias,
                        SqlOperator target)

Registers that one operator is an alias for another.

Parameters:

alias - Operator which is alias

target - Operator to translate calls to