uk.ac.ed.epcc.safe.accounting.db

Class DerefSQLValue<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,R extends uk.ac.ed.epcc.webapp.model.data.DataObject & ExpressionTarget,T>

java.lang.Object

uk.ac.ed.epcc.safe.accounting.db.RemoteSQLValue<H,R,T>

uk.ac.ed.epcc.safe.accounting.db.DerefSQLValue<H,R,T>

Type Parameters:

H - type of owning object

R - type of remote object

T - target type of accessor

All Implemented Interfaces:

uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H,T>, uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>, uk.ac.ed.epcc.webapp.Targetted<T>

public class DerefSQLValue<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,R extends uk.ac.ed.epcc.webapp.model.data.DataObject & ExpressionTarget,T>
extends RemoteSQLValue<H,R,T>
implements uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H,T>

An SQLAccessor for a DerefExpression The remote object is retrieved and the remote expression evaluated programatically.

Author:

spb

Field Summary

Fields

Modifier and Type	Field and Description
protected PropExpression<T>	expr
protected java.lang.Class<? super H>	h_type

Fields inherited from class uk.ac.ed.epcc.safe.accounting.db.RemoteSQLValue

CACHE_REMOTE_ACCESSOR_FEATURE

Constructor Summary

Constructors

Constructor and Description
DerefSQLValue(uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R> a, PropExpression<T> expr, uk.ac.ed.epcc.webapp.AppContext conn)

Method Summary

Methods

Modifier and Type	Method and Description
PropExpression<T>	getExpression()
uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H>	getFilter(uk.ac.ed.epcc.webapp.jdbc.filter.MatchCondition match, T val)
java.lang.Class<? super H>	getFilterType()
uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H>	getNullFilter(boolean is_null)
uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H>	getOrderFilter(boolean descending)
T	getRemoteValue(R o) Get the remote value from the referenced object
T	getRemoteValueFromNull() get the remote value corresponding to a null reference.
java.lang.Class<? super T>	getTarget()
java.lang.String	toString()

Methods inherited from class uk.ac.ed.epcc.safe.accounting.db.RemoteSQLValue

add, getContext, getParameters, getReferenceValue, getRemoteValueFromReference, getRequiredFilter, makeObject

Methods inherited from class java.lang.Object

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

Field Detail

expr

protected final PropExpression<T> expr

h_type

protected final java.lang.Class<? super H extends uk.ac.ed.epcc.webapp.model.data.DataObject> h_type

Constructor Detail

DerefSQLValue

public DerefSQLValue(uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R> a,
             PropExpression<T> expr,
             uk.ac.ed.epcc.webapp.AppContext conn)
              throws java.lang.Exception

Throws:

java.lang.Exception

Method Detail

getExpression

public PropExpression<T> getExpression()

getTarget

public java.lang.Class<? super T> getTarget()

Specified by:

getTarget in interface uk.ac.ed.epcc.webapp.Targetted<T>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getRemoteValue

public T getRemoteValue(R o)

Description copied from class: RemoteSQLValue

Get the remote value from the referenced object

Specified by:

getRemoteValue in class RemoteSQLValue<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,R extends uk.ac.ed.epcc.webapp.model.data.DataObject & ExpressionTarget,T>

Returns:

remote value

getRemoteValueFromNull

public T getRemoteValueFromNull()

Description copied from class: RemoteSQLValue

get the remote value corresponding to a null reference.

Specified by:

getRemoteValueFromNull in class RemoteSQLValue<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,R extends uk.ac.ed.epcc.webapp.model.data.DataObject & ExpressionTarget,T>

Returns:

remote value

getFilter

public uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H> getFilter(uk.ac.ed.epcc.webapp.jdbc.filter.MatchCondition match,
                                                      T val)
                                                                                                           throws uk.ac.ed.epcc.webapp.jdbc.expr.CannotFilterException,
                                                                                                                  uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

Specified by:

getFilter in interface uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,T>

Throws:

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

uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

getOrderFilter

public uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H> getOrderFilter(boolean descending)
                                                                                                                throws uk.ac.ed.epcc.webapp.jdbc.expr.CannotFilterException,
                                                                                                                       uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

Specified by:

getOrderFilter in interface uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,T>

Throws:

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

uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

getNullFilter

public uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter<H> getNullFilter(boolean is_null)
                                                                                                               throws uk.ac.ed.epcc.webapp.jdbc.expr.CannotFilterException,
                                                                                                                      uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

Specified by:

getNullFilter in interface uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,T>

Throws:

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

uk.ac.ed.epcc.webapp.jdbc.filter.NoSQLFilterException

getFilterType

public java.lang.Class<? super H> getFilterType()

Specified by:

getFilterType in interface uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,T>