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

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

java.lang.Object

uk.ac.ed.epcc.safe.accounting.db.RemoteSQLValue<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>

Direct Known Subclasses:

DerefSQLValue

public abstract class RemoteSQLValue<H extends uk.ac.ed.epcc.webapp.model.data.DataObject,R extends uk.ac.ed.epcc.webapp.model.data.DataObject,T>
extends java.lang.Object
implements uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>, uk.ac.ed.epcc.webapp.jdbc.expr.FilterProvider<H,T>

An SQLAccessor that needs to follow a remote reference to access its data. This class performs the de-reference in java rather than using a join so the assumption is that remote table in relatively small.

Author:

spb

Field Summary

Fields

Modifier and Type	Field and Description
static uk.ac.ed.epcc.webapp.Feature	CACHE_REMOTE_ACCESSOR_FEATURE

Constructor Summary

Constructors

Constructor and Description
RemoteSQLValue(uk.ac.ed.epcc.webapp.AppContext c, uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R> a)

Method Summary

Methods

Modifier and Type	Method and Description
int	add(java.lang.StringBuilder sb, boolean qualify)
uk.ac.ed.epcc.webapp.AppContext	getContext()
java.util.List<uk.ac.ed.epcc.webapp.jdbc.filter.PatternArgument>	getParameters(java.util.List<uk.ac.ed.epcc.webapp.jdbc.filter.PatternArgument> list)
uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R>	getReferenceValue() SQLValue for remote object Reference
abstract T	getRemoteValue(R o) Get the remote value from the referenced object
abstract T	getRemoteValueFromNull() get the remote value corresponding to a null reference.
T	getRemoteValueFromReference(uk.ac.ed.epcc.webapp.model.data.reference.IndexedReference<R> ref)
uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter	getRequiredFilter()
T	makeObject(java.sql.ResultSet rs, int pos)

Methods inherited from class java.lang.Object

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

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

getFilter, getFilterType, getNullFilter, getOrderFilter

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

getTarget

Field Detail

CACHE_REMOTE_ACCESSOR_FEATURE

public static final uk.ac.ed.epcc.webapp.Feature CACHE_REMOTE_ACCESSOR_FEATURE

Constructor Detail

RemoteSQLValue

public RemoteSQLValue(uk.ac.ed.epcc.webapp.AppContext c,
              uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R> a)
               throws PropertyCastException

Throws:

PropertyCastException

Method Detail

getReferenceValue

public uk.ac.ed.epcc.webapp.model.data.IndexedFieldValue<H,R> getReferenceValue()

SQLValue for remote object Reference

Returns:

DataObjectRefefenceAccessor

getRemoteValueFromReference

public T getRemoteValueFromReference(uk.ac.ed.epcc.webapp.model.data.reference.IndexedReference<R> ref)

getRemoteValue

public abstract T getRemoteValue(R o)

Get the remote value from the referenced object

Parameters:

o -

Returns:

remote value

getRemoteValueFromNull

public abstract T getRemoteValueFromNull()

get the remote value corresponding to a null reference.

Returns:

remote value

getContext

public uk.ac.ed.epcc.webapp.AppContext getContext()

makeObject

public final T makeObject(java.sql.ResultSet rs,
           int pos)
                   throws uk.ac.ed.epcc.webapp.jdbc.exception.DataException

Specified by:

makeObject in interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>

Throws:

uk.ac.ed.epcc.webapp.jdbc.exception.DataException

add

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

Specified by:

add in interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>

getParameters

public java.util.List<uk.ac.ed.epcc.webapp.jdbc.filter.PatternArgument> getParameters(java.util.List<uk.ac.ed.epcc.webapp.jdbc.filter.PatternArgument> list)

Specified by:

getParameters in interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>

getRequiredFilter

public uk.ac.ed.epcc.webapp.jdbc.filter.SQLFilter getRequiredFilter()

Specified by:

getRequiredFilter in interface uk.ac.ed.epcc.webapp.jdbc.expr.SQLValue<T>