ome.services.graphs

Class GraphPolicy

java.lang.Object

ome.services.graphs.GraphPolicy

Direct Known Subclasses:

BaseGraphPolicyAdjuster

public abstract class GraphPolicy
extends Object

A policy guides how to traverse the graph. This class' methods are expected to be fast and are not required to be thread-safe.

Since:

5.1.0

Author:

m.t.b.carroll@dundee.ac.uk

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GraphPolicy.Ability Abilities that the user may have to operate upon model objects.
static class	GraphPolicy.Action The action to take on an object instance.
static class	GraphPolicy.Details A tuple noting the state of a mapped object instance in the current graph traversal.
static class	GraphPolicy.Orphan If an object instance has any GraphPolicy.Action.EXCLUDEd parents that would prevent it from being orphaned.

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<String,GraphPolicyRulePredicate>	predicates The predicates that have been registered with registerPredicate(GraphPolicyRulePredicate).

Constructor Summary

Constructors

Constructor and Description
GraphPolicy()

Method Summary

Methods

Modifier and Type	Method and Description
static Set<GraphPolicy.Details>	allObjects(Collection<Set<GraphPolicy.Details>> linkedFrom, GraphPolicy.Details rootObject, Collection<Set<GraphPolicy.Details>> linkedTo) Utility method to return all the objects for review as a single set of objects.
abstract GraphPolicy	getCleanInstance() Create a clone of this graph policy that has fresh state.
abstract boolean	isCondition(String name) Check if a condition has been set.
void	noteDetails(org.hibernate.Session session, IObject object, String realClass, long id) Any model object about which policy may be asked is first passed to #noteDetails(IObject, String, long) before #review(Map, Details, Map, Set).
void	registerPredicate(GraphPolicyRulePredicate predicate) Use the given predicate in executing this graph policy.
abstract Set<GraphPolicy.Details>	review(Map<String,Set<GraphPolicy.Details>> linkedFrom, GraphPolicy.Details rootObject, Map<String,Set<GraphPolicy.Details>> linkedTo, Set<String> notNullable, boolean isErrorRules) The action to take about the link between the mapped objects.
abstract void	setCondition(String name) Set a named condition,

Methods inherited from class java.lang.Object

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

Field Detail

predicates

protected final Map<String,GraphPolicyRulePredicate> predicates

The predicates that have been registered with registerPredicate(GraphPolicyRulePredicate).

Constructor Detail

GraphPolicy

public GraphPolicy()

Method Detail

getCleanInstance

public abstract GraphPolicy getCleanInstance()

Create a clone of this graph policy that has fresh state.

Returns:

an instance ready to begin a new graph traversal

registerPredicate

public void registerPredicate(GraphPolicyRulePredicate predicate)

Use the given predicate in executing this graph policy.

Parameters:

predicate - a graph policy predicate

setCondition

public abstract void setCondition(String name)

Set a named condition,

Parameters:

name - the name of the condition

isCondition

public abstract boolean isCondition(String name)

Check if a condition has been set.

Parameters:

name - the name of the condition

Returns:

if the condition is set

noteDetails

public void noteDetails(org.hibernate.Session session,
               IObject object,
               String realClass,
               long id)

Any model object about which policy may be asked is first passed to #noteDetails(IObject, String, long) before #review(Map, Details, Map, Set). Each object is passed only once. Subclasses overriding this method probably ought also override getCleanInstance().

Parameters:

session - the Hibernate session, for obtaining more information about the object

object - an unloaded model object about which policy may be asked

realClass - the real class name of the object

id - the ID of the object

allObjects

public static Set<GraphPolicy.Details> allObjects(Collection<Set<GraphPolicy.Details>> linkedFrom,
                                  GraphPolicy.Details rootObject,
                                  Collection<Set<GraphPolicy.Details>> linkedTo)

Utility method to return all the objects for review as a single set of objects.

Parameters:

linkedFrom - details of the objects linking to the root object

rootObject - details of the root objects

linkedTo - details of the objects linked by the root object

Returns:

details of all the objects passed as arguments

review

public abstract Set<GraphPolicy.Details> review(Map<String,Set<GraphPolicy.Details>> linkedFrom,
                              GraphPolicy.Details rootObject,
                              Map<String,Set<GraphPolicy.Details>> linkedTo,
                              Set<String> notNullable,
                              boolean isErrorRules)
                                         throws GraphException

The action to take about the link between the mapped objects. An GraphPolicy.Action.EXCLUDEd object, once changed from that, may not change back to GraphPolicy.Action.EXCLUDE. An GraphPolicy.Action.OUTSIDE object, once changed to that, may not change back from GraphPolicy.Action.OUTSIDE. GraphPolicy.Orphan values matter only for GraphPolicy.Action.EXCLUDEd objects. Given GraphPolicy.Orphan.RELEVANT if Action#IS_LAST or Action#IS_NOT_LAST can be returned, or could be if after GraphPolicy.Orphan.RELEVANT is returned then resolved for the other object, then appropriate values should be returned accordingly. If Action#RELEVANT is returned for an object then this method may be called again with Action#IS_LAST or Action#IS_NOT_LAST. Class properties' String representation is package.DeclaringClass.propertyName.

Parameters:

linkedFrom - map from class property to objects for which the property links to the root object

rootObject - the object at the center of this review

linkedTo - map from class property to objects to which the property links from the root object

notNullable - which properties from the linkedFrom and linkedTo map keys are not nullable

isErrorRules - if final checks should be performed instead of normal rule matching

Returns:

changes to make, included unchanged details typically cause review as root object

Throws:

GraphException - if there was a problem in applying the policy