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Blueprints property graph implementation for Sesame RDF Sail
package com.tinkerpop.blueprints.impls.sail;
import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.Edge;
import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.blueprints.VertexQuery;
import com.tinkerpop.blueprints.util.DefaultVertexQuery;
import com.tinkerpop.blueprints.util.ElementHelper;
import com.tinkerpop.blueprints.util.MultiIterable;
import com.tinkerpop.blueprints.util.StringFactory;
import com.tinkerpop.blueprints.util.VerticesFromEdgesIterable;
import info.aduna.iteration.CloseableIteration;
import org.openrdf.model.Literal;
import org.openrdf.model.Resource;
import org.openrdf.model.Statement;
import org.openrdf.model.URI;
import org.openrdf.model.Value;
import org.openrdf.model.impl.LiteralImpl;
import org.openrdf.model.impl.URIImpl;
import org.openrdf.sail.SailException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public class SailVertex implements Vertex {
protected Value rawVertex;
protected SailGraph graph;
private static final String URI_BLANK_NODE_PROPERTIES = "RDF graph URI and blank node vertices can not have properties";
private static Map dataTypeToClass = new HashMap();
static {
dataTypeToClass.put(SailTokens.XSD_NS + "string", "java.lang.String");
dataTypeToClass.put(SailTokens.XSD_NS + "int", "java.lang.Integer");
dataTypeToClass.put(SailTokens.XSD_NS + "integer", "java.lang.Integer");
dataTypeToClass.put(SailTokens.XSD_NS + "float", "java.lang.Float");
dataTypeToClass.put(SailTokens.XSD_NS + "double", "java.lang.Double");
}
protected SailVertex(final Value rawVertex, final SailGraph graph) {
this.rawVertex = rawVertex;
this.graph = graph;
}
public Value getRawVertex() {
return this.rawVertex;
}
private void updateLiteral(final Literal oldLiteral, final Literal newLiteral) {
try {
final Set statements = new HashSet();
final CloseableIteration results = this.graph.getSailConnection().get().getStatements(null, null, oldLiteral, false);
while (results.hasNext()) {
statements.add(results.next());
}
results.close();
this.graph.getSailConnection().get().removeStatements(null, null, oldLiteral);
for (Statement statement : statements) {
SailHelper.addStatement(statement.getSubject(), statement.getPredicate(), newLiteral, statement.getContext(), this.graph.getSailConnection().get());
}
} catch (SailException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
public void setProperty(final String key, final Object value) {
if (this.rawVertex instanceof Resource) {
throw new RuntimeException(URI_BLANK_NODE_PROPERTIES);
} else {
boolean update = false;
final Literal oldLiteral = (Literal) this.rawVertex;
if (key.equals(SailTokens.DATATYPE)) {
this.rawVertex = new LiteralImpl(oldLiteral.getLabel(), new URIImpl(this.graph.expandPrefix(value.toString())));
update = true;
} else if (key.equals(SailTokens.LANGUAGE)) {
this.rawVertex = new LiteralImpl(oldLiteral.getLabel(), value.toString());
update = true;
}
if (update) {
this.updateLiteral(oldLiteral, (Literal) this.rawVertex);
}
}
}
public T removeProperty(final String key) {
if (this.rawVertex instanceof Resource) {
throw new RuntimeException(URI_BLANK_NODE_PROPERTIES);
} else {
final Literal oldLiteral = (Literal) this.rawVertex;
if (key.equals(SailTokens.DATATYPE) || key.equals(SailTokens.LANGUAGE)) {
this.rawVertex = new LiteralImpl(oldLiteral.getLabel());
this.updateLiteral(oldLiteral, (Literal) this.rawVertex);
}
if (key.equals(SailTokens.DATATYPE)) {
return (T) oldLiteral.getDatatype().toString();
} else if (key.equals(SailTokens.LANGUAGE)) {
return (T) oldLiteral.getLanguage();
}
}
return null;
}
public T getProperty(final String key) {
if (key.equals(SailTokens.KIND)) {
if (this.rawVertex instanceof Literal)
return (T) SailTokens.LITERAL;
else if (this.rawVertex instanceof URI)
return (T) SailTokens.URI;
else
return (T) SailTokens.BNODE;
}
if (this.rawVertex instanceof Literal) {
final Literal literal = (Literal) rawVertex;
if (key.equals(SailTokens.DATATYPE)) {
if (null != literal.getDatatype())
return (T) literal.getDatatype().stringValue();
else
return null;
} else if (key.equals(SailTokens.LANGUAGE)) {
return (T) literal.getLanguage();
} else if (key.equals(SailTokens.VALUE)) {
return (T) castLiteral(literal);
}
}
return null;
}
public Set getPropertyKeys() {
final Set keys = new HashSet();
if (this.rawVertex instanceof Literal) {
if (null != this.getProperty(SailTokens.DATATYPE)) {
keys.add(SailTokens.DATATYPE);
} else if (null != this.getProperty(SailTokens.LANGUAGE)) {
keys.add(SailTokens.LANGUAGE);
}
keys.add(SailTokens.VALUE);
}
keys.add(SailTokens.KIND);
return keys;
}
public Iterable getEdges(final Direction direction, final String... labels) {
if (direction.equals(Direction.OUT)) {
return this.getOutEdges(labels);
} else if (direction.equals(Direction.IN))
return this.getInEdges(labels);
else {
return new MultiIterable(Arrays.asList(this.getInEdges(labels), this.getOutEdges(labels)));
}
}
public Iterable getVertices(final Direction direction, final String... labels) {
return new VerticesFromEdgesIterable(this, direction, labels);
}
private Iterable getOutEdges(final String... labels) {
if (this.rawVertex instanceof Resource) {
if (labels.length == 0) {
return new SailEdgeIterable((Resource) this.rawVertex, null, null, this.graph);
} else if (labels.length == 1) {
return new SailEdgeIterable((Resource) this.rawVertex, new URIImpl(this.graph.expandPrefix(labels[0])), null, this.graph);
} else {
final List> edges = new ArrayList>();
for (final String label : labels) {
edges.add(new SailEdgeIterable((Resource) this.rawVertex, new URIImpl(this.graph.expandPrefix(label)), null, this.graph));
}
return new MultiIterable(edges);
}
} else {
return Collections.emptyList();
}
}
private Iterable getInEdges(final String... labels) {
if (labels.length == 0) {
return new SailEdgeIterable(null, null, this.rawVertex, this.graph);
} else if (labels.length == 1) {
return new SailEdgeIterable(null, new URIImpl(this.graph.expandPrefix(labels[0])), this.rawVertex, this.graph);
} else {
final List> edges = new ArrayList>();
for (final String label : labels) {
edges.add(new SailEdgeIterable(null, new URIImpl(this.graph.expandPrefix(label)), this.rawVertex, this.graph));
}
return new MultiIterable(edges);
}
}
public Edge addEdge(final String label, final Vertex vertex) {
return this.graph.addEdge(null, this, vertex, label);
}
public VertexQuery query() {
return new DefaultVertexQuery(this);
}
public String toString() {
return StringFactory.vertexString(this);
}
protected static Object castLiteral(final Literal literal) {
if (null != literal.getDatatype()) {
String className = dataTypeToClass.get(literal.getDatatype().stringValue());
if (null == className)
return literal.getLabel();
else {
try {
Class c = Class.forName(className);
if (c == String.class) {
return literal.getLabel();
} else if (c == Float.class) {
return Float.valueOf(literal.getLabel());
} else if (c == Integer.class) {
return Integer.valueOf(literal.getLabel());
} else if (c == Double.class) {
return Double.valueOf(literal.getLabel());
} else {
return literal.getLabel();
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
return literal.getLabel();
}
}
} else {
return literal.getLabel();
}
}
public void remove() {
this.graph.removeVertex(this);
}
public int hashCode() {
return this.getId().hashCode();
}
public boolean equals(final Object object) {
return ElementHelper.areEqual(this, object);
}
public Object getId() {
return this.rawVertex.toString();
}
}
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