package com.dooapp.gaedo.blueprints.indexable;
import java.util.Collection;
import java.util.SortedSet;
import java.util.UUID;
import com.dooapp.gaedo.blueprints.AbstractBluePrintsBackedFinderService;
import com.dooapp.gaedo.blueprints.GraphUtils;
import com.dooapp.gaedo.blueprints.Kind;
import com.dooapp.gaedo.blueprints.Properties;
import com.dooapp.gaedo.blueprints.strategies.GraphMappingStrategy;
import com.dooapp.gaedo.blueprints.strategies.StrategyType;
import com.dooapp.gaedo.blueprints.transformers.ClassLiteralTransformer;
import com.dooapp.gaedo.blueprints.transformers.Literals;
import com.dooapp.gaedo.blueprints.transformers.Tuples;
import com.dooapp.gaedo.blueprints.transformers.TypeUtils;
import com.dooapp.gaedo.extensions.views.InViewService;
import com.dooapp.gaedo.finders.Informer;
import com.dooapp.gaedo.finders.repository.ServiceRepository;
import com.dooapp.gaedo.finders.root.InformerFactory;
import com.dooapp.gaedo.properties.Property;
import com.dooapp.gaedo.properties.PropertyProvider;
import com.dooapp.gaedo.properties.TypeProperty;
import com.tinkerpop.blueprints.pgm.CloseableSequence;
import com.tinkerpop.blueprints.pgm.Edge;
import com.tinkerpop.blueprints.pgm.Index;
import com.tinkerpop.blueprints.pgm.IndexableGraph;
import com.tinkerpop.blueprints.pgm.Vertex;
import com.tinkerpop.blueprints.pgm.oupls.sail.GraphSail;
/**
* Indexable graph backed version of finder service.
*
* Notice we maintain {@link AbstractCooperantFinderService} infos about objects
* being accessed as String containing, in fact, vertex ids
*
* @author ndx
*
* @param <DataType>
* type of data managed by this service
* @param <InformerType>
* type of informer used to provide infos about managed data
*/
public class IndexableGraphBackedFinderService<DataType, InformerType extends Informer<DataType>> extends
AbstractBluePrintsBackedFinderService<IndexableGraph, DataType, InformerType> {
public static final String TYPE_EDGE_NAME = GraphUtils.getEdgeNameFor(TypeProperty.INSTANCE);
public static ClassLiteralTransformer classTransformer = (ClassLiteralTransformer) Literals.get(Class.class);
/**
* Construct a default service, for which the mapping strategy is the
* default one (that's to say {@link StrategyType#beanBased}
*
* @param containedClass
* contained data class
* @param informerClass
* informer calss associated to that data class
* @param factory
* informer factory used when performing queries
* @param repository
* service repository used to load other classes
* @param provider
* property provider
* @param graph
* graph used as storage
* @see IndexableGraphBackedFinderService#IndexableGraphBackedFinderService(IndexableGraph,
* Class, Class, InformerFactory, ServiceRepository, PropertyProvider,
* StrategyType)
* @deprecated replaced by
* {@link IndexableGraphBackedFinderService#IndexableGraphBackedFinderService(IndexableGraph, Class, Class, InformerFactory, ServiceRepository, PropertyProvider)}
*/
public IndexableGraphBackedFinderService(Class<DataType> containedClass, Class<InformerType> informerClass, InformerFactory factory,
ServiceRepository repository, PropertyProvider provider, IndexableGraph graph) {
this(graph, containedClass, informerClass, factory, repository, provider, StrategyType.beanBased);
}
public IndexableGraphBackedFinderService(IndexableGraph graph, Class<DataType> containedClass, Class<InformerType> informerClass, InformerFactory factory,
ServiceRepository repository, PropertyProvider provider, GraphMappingStrategy<DataType> strategy) {
super(graph, containedClass, informerClass, factory, repository, provider, strategy);
}
/**
* Construct a gaedo servcie allowing reading/writing to an indexable graph
*
* @param graph
* graph we want to write/read to/from
* @param containedClass
* class we want to map to that graph
* @param informerClass
* informer used to allow easy queries on that class
* @param factory
* informer factory
* @param repository
* service repository, to load other classes
* @param provider
* property provider
* @param strategy
* mapping strategy. If bean based, the bean fields will define
* which edges are read/written. If graph based, that's the edges
* that define how the object will be loaded.
*/
public IndexableGraphBackedFinderService(IndexableGraph graph, Class<DataType> containedClass, Class<InformerType> informerClass, InformerFactory factory,
ServiceRepository repository, PropertyProvider provider, StrategyType strategy) {
super(graph, containedClass, informerClass, factory, repository, provider, strategy);
}
public IndexableGraphBackedFinderService(IndexableGraph graph, Class<DataType> containedClass, Class<InformerType> informerClass, InformerFactory factory,
ServiceRepository repository, PropertyProvider provider) {
super(graph, containedClass, informerClass, factory, repository, provider);
}
@Override
public Vertex loadVertexFor(String objectVertexId, String className) {
CloseableSequence<Vertex> matching = database.getIndex(Index.VERTICES, Vertex.class).get(Properties.value.name(), objectVertexId);
if (matching.hasNext()) {
while (matching.hasNext()) {
Vertex vertex = matching.next();
String vertexTypeName = getEffectiveType(vertex);
switch (GraphUtils.getKindOf(vertex)) {
case literal:
case bnode:
case uri:
if (className.equals(vertexTypeName)) {
return vertex;
}
break;
default:
return vertex;
}
}
}
return null;
}
@Override
public String getIdOfVertex(Vertex objectVertex) {
return objectVertex.getProperty(Properties.value.name()).toString();
}
/**
* When creating an empty vertex, we immediatly link it to its associated
* type vertex : a long will as a consequence be linked to the Long class
*
* @param vertexId
* @param valueClass
* @return
* @see com.dooapp.gaedo.blueprints.AbstractBluePrintsBackedFinderService#createEmptyVertex(java.lang.String,
* java.lang.Class)
*/
@Override
protected Vertex createEmptyVertex(String vertexId, Class<? extends Object> valueClass) {
// technical vertex id is no more used by gaedo which only rley upon the
// getIdOfVertex method !
Vertex returned = database.addVertex(valueClass.getName() + ":" + vertexId);
returned.setProperty(Properties.value.name(), vertexId);
if (Literals.containsKey(valueClass)) {
// some literals aren't so ... literal, as they can accept incoming
// connections (like classes)
returned.setProperty(Properties.kind.name(), Literals.get(valueClass).getKind().name());
returned.setProperty(Properties.type.name(), TypeUtils.getType(valueClass));
} else {
if (repository.containsKey(valueClass)) {
returned.setProperty(Properties.kind.name(), Kind.uri.name());
} else if (Tuples.containsKey(valueClass)) {
// some literals aren't so ... literal, as they can accept
// incoming connections (like classes)
returned.setProperty(Properties.kind.name(), Tuples.get(valueClass).getKind().name());
}
// obtain vertex for type
Vertex classVertex = classTransformer.getVertexFor(getDriver(), valueClass);
Edge toType = getDriver().createEdgeFor(returned, classVertex, TypeProperty.INSTANCE);
/*
* Make sure literals are literals by changing that particular edge
* context to a null value. Notice we COULD have stored literal type
* as a property, instead of using
*/
toType.setProperty(GraphSail.CONTEXT_PROP, GraphUtils.asSailProperty(GraphUtils.GAEDO_CONTEXT));
}
// Yup, this if has no default else statement, and that's normal.
return returned;
}
@Override
protected String getEffectiveType(Vertex vertex) {
return getStrategy().getEffectiveType(vertex);
}
@Override
protected void setValue(Vertex vertex, Object value) {
vertex.setProperty(Properties.value.name(), value);
}
@Override
protected Object getValue(Vertex vertex) {
return vertex.getProperty(Properties.value.name());
}
public Edge createEdgeFor(Vertex fromVertex, Vertex toVertex, Property property) {
String edgeNameFor = GraphUtils.getEdgeNameFor(property);
Edge edge = database.addEdge(getEdgeId(fromVertex, toVertex, property), fromVertex, toVertex, edgeNameFor);
String predicateProperty = GraphUtils.asSailProperty(GraphUtils.getEdgeNameFor(property));
edge.setProperty(GraphSail.PREDICATE_PROP, predicateProperty);
Collection<String> contexts = getLens();
StringBuilder contextPropertyBuilder = new StringBuilder();
if (contexts.size() == 0) {
contextPropertyBuilder.append(GraphUtils.asSailProperty(GraphSail.NULL_CONTEXT_NATIVE));
} else {
for (String context : contexts) {
if (contextPropertyBuilder.length() > 0)
contextPropertyBuilder.append(" ");
contextPropertyBuilder.append(GraphUtils.asSailProperty(context));
}
}
String contextProperty = contextPropertyBuilder.toString();
edge.setProperty(GraphSail.CONTEXT_PROP, contextProperty);
// Finally build the context-predicate property by concatenating both
edge.setProperty(GraphSail.CONTEXT_PROP + GraphSail.PREDICATE_PROP, contextProperty + " " + predicateProperty);
return edge;
}
public String getEdgeId(Vertex fromVertex, Vertex toVertex, Property property) {
return fromVertex.getId().toString() + "_to_" + toVertex.getId().toString() + "___" + UUID.randomUUID().toString();
}
@Override
public InViewService<DataType, InformerType, SortedSet<String>> focusOn(SortedSet<String> lens) {
AbstractBluePrintsBackedFinderService<IndexableGraph, DataType, InformerType> returned = new IndexableGraphBackedFinderService<DataType, InformerType>(
database, containedClass, informerClass, getInformerFactory(), repository, propertyProvider,
/* strategy is local to service ! */ getStrategy().derive());
returned.setLens(lens);
return returned;
}
}