net.sf.farrago.ojrex
Class FarragoOJRexStaticMethodImplementor

java.lang.Object
  net.sf.farrago.ojrex.FarragoOJRexImplementor
      net.sf.farrago.ojrex.FarragoOJRexStaticMethodImplementor

All Implemented Interfaces:

OJRexImplementor

public class FarragoOJRexStaticMethodImplementor
extends FarragoOJRexImplementor

FarragoOJRexStaticMethodImplementor implements OJRexImplementor by generating a call to a static Java method.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/ojrex/FarragoOJRexStaticMethodImplementor.java#15 $

Author:

John V. Sichi

Field Summary

private boolean	allowSql
private Class	declaringClass
private Method	method
private String	methodName
private RelDataType	returnType

Constructor Summary

FarragoOJRexStaticMethodImplementor(Class declaringClass, String methodName)
Creates an implementor for a call to a system-provided static method.

FarragoOJRexStaticMethodImplementor(Method method, boolean allowSql, RelDataType returnType)
Creates an implementor for a call to a user-defined routine (UDR) implemented as an external Java static method.

Method Summary

Expression	implementFarrago(FarragoRexToOJTranslator translator, RexCall call, Expression[] operands) Refined version of OJRexImplementor.implement(org.eigenbase.oj.rex.RexToOJTranslator, org.eigenbase.rex.RexCall, openjava.ptree.Expression[]).
private Expression	implementSystemCall(FarragoRexToOJTranslator translator, RexCall call, Expression[] operands)

Methods inherited from class net.sf.farrago.ojrex.FarragoOJRexImplementor

canImplement, implement

Methods inherited from class java.lang.Object

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

Field Detail

method

private final Method method

allowSql

private final boolean allowSql

returnType

private final RelDataType returnType

declaringClass

private final Class declaringClass

methodName

private final String methodName

Constructor Detail

FarragoOJRexStaticMethodImplementor

public FarragoOJRexStaticMethodImplementor(Method method,
                                           boolean allowSql,
                                           RelDataType returnType)

Creates an implementor for a call to a user-defined routine (UDR) implemented as an external Java static method.

Parameters:

method - UDR implementation

allowSql - whether to allow reentrant invocation of SQL from within the called method

returnType - SQL type to impose on returned Java value

FarragoOJRexStaticMethodImplementor

public FarragoOJRexStaticMethodImplementor(Class declaringClass,
                                           String methodName)

Creates an implementor for a call to a system-provided static method.

Parameters:

declaringClass - class which declares method

methodName - name of static method; overload resolution happens implicitly based on operand types in each invocation

Method Detail

implementFarrago

public Expression implementFarrago(FarragoRexToOJTranslator translator,
                                   RexCall call,
                                   Expression[] operands)

Description copied from class: FarragoOJRexImplementor

Refined version of OJRexImplementor.implement(org.eigenbase.oj.rex.RexToOJTranslator, org.eigenbase.rex.RexCall, openjava.ptree.Expression[]).

Specified by:

implementFarrago in class FarragoOJRexImplementor

Parameters:

translator - provides Farrago-specific translation context

call - the call to be translated

operands - call's operands, which have already been translated independently

implementSystemCall

private Expression implementSystemCall(FarragoRexToOJTranslator translator,
                                       RexCall call,
                                       Expression[] operands)