uk.ac.ed.epcc.webapp.jdbc.expr

Class DateDerefSQLExpression<H extends DataObject,R extends DataObject>

java.lang.Object

uk.ac.ed.epcc.webapp.jdbc.expr.DerefSQLExpression<H,R,java.util.Date>

uk.ac.ed.epcc.webapp.jdbc.expr.DateDerefSQLExpression<H,R>

All Implemented Interfaces:

DateSQLExpression, GroupingSQLValue<java.util.Date>, SQLExpression<java.util.Date>, SQLValue<java.util.Date>, Targetted<java.util.Date>

public class DateDerefSQLExpression<H extends DataObject,R extends DataObject>
extends DerefSQLExpression<H,R,java.util.Date>
implements DateSQLExpression

Field Summary

Fields inherited from class uk.ac.ed.epcc.webapp.jdbc.expr.DerefSQLExpression

a, remote_expression, required_filter

Constructor Summary

Constructors

Constructor and Description
DateDerefSQLExpression(IndexedSQLValue<H,R> a, DateSQLExpression expr, SQLFilter fil)
DateDerefSQLExpression(IndexedSQLValue a, DateSQLExpression expr)

Method Summary

Modifier and Type	Method and Description
static <H extends DataObject,R extends DataObject> DateDerefSQLExpression<H,R>	convertToDate(SQLContext sql, DerefSQLExpression<H,R,? extends java.lang.Number> expr, long res) helper method to allow a SQLContext to convert DerefSQLExpressions
SQLExpression<? extends java.lang.Number>	getMillis() get an SQLExpression for the millisecond value of the date
SQLExpression<? extends java.lang.Number>	getSeconds() get an SQLExpression for the second value of the date
boolean	preferSeconds() Would this expression preferentially use seconds

Methods inherited from class uk.ac.ed.epcc.webapp.jdbc.expr.DerefSQLExpression

add, convertToMillis, convertToSeconds, equals, getParameters, getRequiredFilter, getTarget, hashCode, makeObject

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLExpression

equals, groupingIsomorphic, hashCode

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.GroupingSQLValue

addGroup, checkContentsCanGroup, getGroupParameters

Methods inherited from interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue

add, getParameters, getRequiredFilter, makeObject

Methods inherited from interface uk.ac.ed.epcc.webapp.Targetted

getTarget

Constructor Detail

DateDerefSQLExpression

public DateDerefSQLExpression(IndexedSQLValue a,
                              DateSQLExpression expr)
                       throws java.lang.Exception

Parameters:

a -

expr -

Throws:

java.lang.Exception

DateDerefSQLExpression

public DateDerefSQLExpression(IndexedSQLValue<H,R> a,
                              DateSQLExpression expr,
                              SQLFilter fil)

Method Detail

convertToDate

public static <H extends DataObject,R extends DataObject> DateDerefSQLExpression<H,R> convertToDate(SQLContext sql,
                                                                                                    DerefSQLExpression<H,R,? extends java.lang.Number> expr,
                                                                                                    long res)

helper method to allow a SQLContext to convert DerefSQLExpressions

Parameters:

sql - SQLContext

expr -

res - long resolution in milliseconds of numeric expression

Returns:

getMillis

public SQLExpression<? extends java.lang.Number> getMillis()

Description copied from interface: DateSQLExpression

get an SQLExpression for the millisecond value of the date

Specified by:

getMillis in interface DateSQLExpression

Returns:

SQLExpression giving milliseconds since epoch

getSeconds

public SQLExpression<? extends java.lang.Number> getSeconds()

Description copied from interface: DateSQLExpression

get an SQLExpression for the second value of the date

Specified by:

getSeconds in interface DateSQLExpression

Returns:

SQLExpression giving seconds since epoch

preferSeconds

public boolean preferSeconds()

Description copied from interface: DateSQLExpression

Would this expression preferentially use seconds

Specified by:

preferSeconds in interface DateSQLExpression

Returns:

boolean