uk.ac.ed.epcc.webapp.model.data

Class LinkManager.Link<L extends DataObject,R extends DataObject>

java.lang.Object

uk.ac.ed.epcc.webapp.model.data.DataObject

uk.ac.ed.epcc.webapp.model.data.IndexedLinkManager.Link<L,R>

uk.ac.ed.epcc.webapp.model.data.LinkManager.Link<L,R>

Type Parameters:

L - Left end type

R - Right end type

All Implemented Interfaces:

UIGenerator, Contexed, ContextIndexed, Identified, Indexed, Owned, Releasable

Direct Known Subclasses:

AbstractRelationship.Link, ResponseDataManager.ResponseData

Enclosing class:

LinkManager<T extends LinkManager.Link<L,R>,L extends DataObject,R extends DataObject>

public abstract static class LinkManager.Link<L extends DataObject,R extends DataObject>
extends IndexedLinkManager.Link<L,R>
implements UIGenerator

Link is an object representing an entry in a linkage table. Link objects are not primary model objects themselves but represent many to one relationships between model objects. To a first approximation Link objects only contain references to the 2 model objects on the ends of the links In many cases we will also want to add status and Date fields

Link objects are pseudo inner classes. We make the manage reference explicit to avoid Link being generic parameterised by itself.

The appropriate LinkManager Link should always be subclasses to improve type safety. The getLeft()/getRight() methods are made protected to force us to add sensibly named accessors in sub-classes

Field Summary

Fields inherited from class uk.ac.ed.epcc.webapp.model.data.DataObject

DEBUG, record

Fields inherited from interface uk.ac.ed.epcc.webapp.forms.Identified

MAX_IDENTIFIER

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	Link(LinkManager<?,L,R> man, Repository.Record res)

Method Summary

Modifier and Type	Method and Description
ContentBuilder	addContent(ContentBuilder builder)
java.lang.String	getIdentifier(int max_length) Generate Identifier with advisory max length.
protected LinkManager	getLinkManager() allow sub-classes to get the LinkManager don't make the return type generic its much easier for sub-classes to implement getFactory() methods that cast correctly than have a generic signature that can be used use-fully type checking is preserved by getting the constructor right

Methods inherited from class uk.ac.ed.epcc.webapp.model.data.IndexedLinkManager.Link

changeLeft, changeRight, getFactory, getIndexedLinkManager, getLeft, getLeftID, getRight, getRightID, isLeftPeer, isRightPeer, post_commit, pre_commit, release, setCachedLeft, setCachedRight, setup

Methods inherited from class uk.ac.ed.epcc.webapp.model.data.DataObject

addToMap, addToMap, addToMap, commit, delete, empty, equals, formUpdate, getContext, getDatabaseService, getFactoryTag, getID, getIdentifier, getLogger, getMap, getMap, getOwningFactory, getRecord, getRecord, getRecord, getSQLContext, getUniqueIdName, hashCode, isLocked, lock, postCreate, setContents, setDirty, setMap, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Link

protected Link(LinkManager<?,L,R> man,
               Repository.Record res)

Method Detail

getLinkManager

protected LinkManager getLinkManager()

allow sub-classes to get the LinkManager don't make the return type generic its much easier for sub-classes to implement getFactory() methods that cast correctly than have a generic signature that can be used use-fully type checking is preserved by getting the constructor right

Returns:

getIdentifier

public java.lang.String getIdentifier(int max_length)

Description copied from interface: Identified

Generate Identifier with advisory max length.

Specified by:

getIdentifier in interface Identified

Overrides:

getIdentifier in class DataObject

Parameters:

max_length - advisory max length

Returns:

String identifier

addContent

public ContentBuilder addContent(ContentBuilder builder)

Specified by:

addContent in interface UIGenerator