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

Interface NestedSQLValue<T,N>

Type Parameters:

T - type of SQLValue

N - type of nested SQLValue

All Superinterfaces:

GroupingSQLValue<T>, SQLValue<T>, Targetted<T>

All Known Implementing Classes:

DateSQLValue, DoubleConvertSQLValue, DurationConvertSQLValue, DurationSecondConvertSQLValue, IntConvertSQLValue, LabellerSQLValue, LongConvertSQLValue, MillisecondSQLValue, SQLValuePatternTransform, StringConvertSQLValue, TypeConverterSQLValue, TypeFilterProducerSQLValue

public interface NestedSQLValue<T,N>
extends SQLValue<T>, GroupingSQLValue<T>

A SQLValue that wraps a different one It includes default methods to handle any nested GroupingSQLValue.

Method Summary

Modifier and Type	Method and Description
default int	addGroup(java.lang.StringBuilder sb, boolean qualify) Add the group-by clause to a query.
default boolean	checkContentsCanGroup() return false if this instance is not able to perform grouping.
default java.util.List<PatternArgument>	getGroupParameters(java.util.List<PatternArgument> list) Get the parameters for a group-by clause.
SQLValue<N>	getNested()
default SQLFilter	getRequiredFilter() Get an SQLFilter required to be added to the filter set.
default boolean	groupingIsomorphic() Is there always a one-to-one mapping between groups and values

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

add, getParameters, makeObject

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

getTarget

Method Detail

getRequiredFilter

default 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<T>

Returns:

null or SQLFilter

addGroup

default int addGroup(java.lang.StringBuilder sb,
                     boolean qualify)

Description copied from interface: GroupingSQLValue

Add the group-by clause to a query. Note this can be a null operation in which case it will return zero.

Specified by:

addGroup in interface GroupingSQLValue<T>

Returns:

actual number of fields added

getGroupParameters

default java.util.List<PatternArgument> getGroupParameters(java.util.List<PatternArgument> list)

Description copied from interface: GroupingSQLValue

Get the parameters for a group-by clause.

Specified by:

getGroupParameters in interface GroupingSQLValue<T>

Returns:

modified list

getNested

SQLValue<N> getNested()

checkContentsCanGroup

default boolean checkContentsCanGroup()

Description copied from interface: GroupingSQLValue

return false if this instance is not able to perform grouping.

Specified by:

checkContentsCanGroup in interface GroupingSQLValue<T>

Returns:

groupingIsomorphic

default boolean groupingIsomorphic()

Description copied from interface: GroupingSQLValue

Is there always a one-to-one mapping between groups and values

Specified by:

groupingIsomorphic in interface GroupingSQLValue<T>

Returns: