Package com.mckoi.database

Class InternalFunctionFactory.DateObFunction

java.lang.Object

com.mckoi.database.AbstractFunction

com.mckoi.database.InternalFunctionFactory.DateObFunction

All Implemented Interfaces:

Function

Enclosing class:

InternalFunctionFactory

static class InternalFunctionFactory.DateObFunction
extends AbstractFunction

Field Summary

Fields

Modifier and Type	Field	Description
private static java.text.DateFormat	date_format_ful
private static java.text.DateFormat	date_format_lon
private static java.text.DateFormat	date_format_med
private static java.text.DateFormat	date_format_sho	The date format object that handles the conversion of Date objects to a string readable representation of the given date.
private static java.text.DateFormat	date_format_sql
private static TType	DATE_TYPE

Constructor Summary

Constructors

Constructor	Description
DateObFunction(Expression[] params)

Method Summary

Modifier and Type	Method	Description
private static TObject	dateVal(java.util.Date d)
TObject	evaluate(GroupResolver group, VariableResolver resolver, QueryContext context)	Evaluates the function and returns a TObject that represents the result of the function.
TType	returnTType(VariableResolver resolver, QueryContext context)	By Default, we assume a function returns a Numeric object.

Methods inherited from class com.mckoi.database.AbstractFunction

allElements, allVariables, getName, getParameter, init, isAggregate, isGlob, parameterCount, prepareParameters, returnTType, setAggregate, toString

Methods inherited from class java.lang.Object

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

Field Detail

DATE_TYPE

private static final TType DATE_TYPE

date_format_sho

private static final java.text.DateFormat date_format_sho

The date format object that handles the conversion of Date objects to a string readable representation of the given date.

NOTE: Due to bad design these objects are not thread-safe.

date_format_sql

private static final java.text.DateFormat date_format_sql

date_format_med

private static final java.text.DateFormat date_format_med

date_format_lon

private static final java.text.DateFormat date_format_lon

date_format_ful

private static final java.text.DateFormat date_format_ful

Constructor Detail

DateObFunction

public DateObFunction(Expression[] params)

Method Detail

dateVal

private static TObject dateVal(java.util.Date d)

evaluate

public TObject evaluate(GroupResolver group,
                        VariableResolver resolver,
                        QueryContext context)

Description copied from interface: Function

Evaluates the function and returns a TObject that represents the result of the function. The VariableResolver object should be used to look up variables in the parameter of the function. The 'FunctionTable' object should only be used when the function is a grouping function. For example, 'avg(value_of)'.

returnTType

public TType returnTType(VariableResolver resolver,
                         QueryContext context)

Description copied from class: AbstractFunction

By Default, we assume a function returns a Numeric object.

Specified by:

returnTType in interface Function

Overrides:

returnTType in class AbstractFunction