Procedural Values

It is possible to define procedural values in the graph and compute their values using graph interface.

Currently the methods for computing the values are:

• <T> T getRelatedValue2(Resource subject, Resource relation) throws DatabaseException;
• <T> T getPossibleRelatedValue2(Resource subject, Resource relation) throws DatabaseException;
• <T> T getRelatedValue2(Resource subject, Resource relation, Object context) throws DatabaseException;
• <T> T getPossibleRelatedValue2(Resource subject, Resource relation, Object context) throws DatabaseException;
• <T> T getRelatedValue2(Resource subject, Resource relation, Binding binding) throws DatabaseException;
• <T> T getPossibleRelatedValue2(Resource subject, Resource relation, Binding binding) throws DatabaseException;
• <T> T getRelatedValue2(Resource subject, Resource relation, Object context, Binding binding) throws DatabaseException;
• <T> T getPossibleRelatedValue2(Resource subject, Resource relation, Object context, Binding binding) throws DatabaseException;

These methods work like getRelatedValue and getPossibleRelatedValue -methods. They follow the given relation from the given subject and then determine the value based on the resource found. If the resource is a literal, then they work exactly like getRelatedValue and getPossibleRelatedValue. They however extend the old functionality in two ways:

• If the found resource is an instance of ExternalValue, then the URI of the resource is used to find a value that is declared using extensions and Java annotations.
• If the found resource is an instance of Value, the mechanisms first finds the property ConvertsToValueWith of the value and uses it compute the value.

These two mechanisms are detailed below.