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

Class PostgresqlDateConverter

java.lang.Object

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

All Implemented Interfaces:

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

public class PostgresqlDateConverter
extends java.lang.Object
implements DateSQLExpression

Constructor Summary

Constructors

Constructor and Description
PostgresqlDateConverter(long res, SQLExpression<? extends java.lang.Number> val)

Method Summary

Modifier and Type	Method and Description
int	add(java.lang.StringBuilder sb, boolean qualify) Add the expression to a StringBuilder
boolean	equals(java.lang.Object obj)
SQLExpression<? extends java.lang.Number>	getMillis() get an SQLExpression for the millisecond value of the date
java.util.List<PatternArgument>	getParameters(java.util.List<PatternArgument> list) Add parameters for this value to a list.
SQLFilter	getRequiredFilter() Get an SQLFilter required to be added to the filter set.
SQLExpression<? extends java.lang.Number>	getSeconds() get an SQLExpression for the second value of the date
java.lang.Class<java.util.Date>	getTarget() Get the type of the returned object as far as it is known.
int	hashCode()
java.util.Date	makeObject(java.sql.ResultSet rs, int pos) Extract a result of the expression from a ResultSet into an object of the specified type.
boolean	preferSeconds() Would this expression preferentially use seconds
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

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

groupingIsomorphic

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

addGroup, checkContentsCanGroup, getGroupParameters

Constructor Detail

PostgresqlDateConverter

public PostgresqlDateConverter(long res,
                               SQLExpression<? extends java.lang.Number> val)

Method Detail

add

public int add(java.lang.StringBuilder sb,
               boolean qualify)

Description copied from interface: SQLValue

Add the expression to a StringBuilder

Specified by:

add in interface SQLValue<java.util.Date>

Parameters:

sb - StringBuilder to modify

qualify - boolean should fields be qualified with the table name

Returns:

number of fields added

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

getParameters

public java.util.List<PatternArgument> getParameters(java.util.List<PatternArgument> list)

Description copied from interface: SQLValue

Add parameters for this value to a list.

Specified by:

getParameters in interface SQLValue<java.util.Date>

Parameters:

list - to modify

Returns:

modified list of parameter objects

makeObject

public java.util.Date makeObject(java.sql.ResultSet rs,
                                 int pos)
                          throws DataException,
                                 java.sql.SQLException

Description copied from interface: SQLValue

Extract a result of the expression from a ResultSet into an object of the specified type. Note that this method is also used to extract the result of functions over the result type.

Specified by:

makeObject in interface SQLValue<java.util.Date>

Parameters:

rs - ResultSet

Returns:

produced object

Throws:

DataException

java.sql.SQLException

getRequiredFilter

public SQLFilter getRequiredFilter()

Description copied from interface: SQLValue

Get an SQLFilter required to be added to the filter set. This is usually to implement a join.

Specified by:

getRequiredFilter in interface SQLValue<java.util.Date>

Returns:

null or SQLFilter

getTarget

public java.lang.Class<java.util.Date> getTarget()

Description copied from interface: Targetted

Get the type of the returned object as far as it is known. Normally this should be the erasure type corresponding to T.

Specified by:

getTarget in interface Targetted<java.util.Date>

Returns:

Class object for return type

hashCode

public int hashCode()

Specified by:

hashCode in interface SQLExpression<java.util.Date>

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Specified by:

equals in interface SQLExpression<java.util.Date>

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

preferSeconds

public boolean preferSeconds()

Description copied from interface: DateSQLExpression

Would this expression preferentially use seconds

Specified by:

preferSeconds in interface DateSQLExpression

Returns:

boolean