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EdgeImpl.java
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EdgeImpl.java
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/**
* Copyright (c) 2002-2011 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.collections.graphdb.impl;
import java.util.HashSet;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.Set;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.DynamicRelationshipType;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.PropertyContainer;
import org.neo4j.graphdb.Relationship;
import org.neo4j.collections.graphdb.ConnectionMode;
import org.neo4j.collections.graphdb.Connector;
import org.neo4j.collections.graphdb.ConnectorType;
import org.neo4j.collections.graphdb.DatabaseService;
import org.neo4j.collections.graphdb.Edge;
import org.neo4j.collections.graphdb.EdgeElement;
import org.neo4j.collections.graphdb.EdgeType;
import org.neo4j.collections.graphdb.LeftRestrictedConnectionMode;
import org.neo4j.collections.graphdb.Vertex;
import org.neo4j.collections.graphdb.VertexType;
public class EdgeImpl extends VertexImpl implements Edge{
private class ElementIterable implements Iterable<Vertex>{
private final ConnectorType<?> connectorType;
public ElementIterable(ConnectorType<?> connectorType) {
this.connectorType = connectorType;
}
@Override
public Iterator<Vertex> iterator() {
return new ElementIterator(connectorType);
}
}
private class ElementIterator implements Iterator<Vertex>{
private final Iterator<Relationship> rels;
public ElementIterator(ConnectorType<?> connectorType) {
this.rels = getNode().getRelationships(DynamicRelationshipType.withName(getType().getName()+EDGEROLE_SEPARATOR+connectorType.getName()), Direction.OUTGOING).iterator();
}
@Override
public boolean hasNext() {
return rels.hasNext();
}
@Override
public Vertex next() {
Vertex elem = getDb().getVertex(rels.next().getEndNode());
return elem;
}
@Override
public void remove() {
}
}
private class RelationshipElementIterable implements Iterable<EdgeElement>{
private final Set<Connector<?>> connectorTypes;
public RelationshipElementIterable() {
this.connectorTypes = getType().getConnectors();
}
public RelationshipElementIterable(
Set<Connector<?>> connectorTypes) {
this.connectorTypes = connectorTypes;
}
@Override
public Iterator<EdgeElement> iterator() {
return new RelationshipElementIterator(connectorTypes);
}
}
private class RelationshipElementIterator implements Iterator<EdgeElement>{
private final Set<Connector<?>> connectorTypes;
private int index = 0;
RelationshipElementIterator(
Set<Connector<?>> connectorTypes) {
this.connectorTypes = connectorTypes;
}
@Override
public boolean hasNext() {
return index < connectorTypes.size();
}
@Override
public EdgeElement next() {
if(hasNext()){
String connectorTypeName = getType().getName().substring(getType().getName().indexOf(EDGEROLE_SEPARATOR)+3);
Connector<?> connector = getType().getConnector(connectorTypeName);
Iterable<Vertex> elems = new ElementIterable(connector.getConnectorType());
return new EdgeElement(connector.getConnectorType(), elems);
}else{
throw new NoSuchElementException();
}
}
@Override
public void remove() {
}
}
private EdgeType relType;
EdgeImpl(Node node){
super(node);
}
@Override
public void delete() {
getNode().delete();
}
@Override
public DatabaseService getDb() {
return new GraphDatabaseImpl(getNode().getGraphDatabase());
}
@Override
public Iterable<EdgeElement> getEdgeElements() {
return new RelationshipElementIterable();
}
@Override
public Iterable<EdgeElement> getEdgeElements(ConnectorType<?>... connectorTypes) {
Set<Connector<?>> connectorTypeSet = new HashSet<Connector<?>>();
for(ConnectorType<?> connectorType: connectorTypes){
Connector<?> er = new Connector(connectorType, getType());
connectorTypeSet.add(er);
}
return new RelationshipElementIterable(connectorTypeSet);
}
@Override
public Iterable<Edge> getEdges(EdgeType edgeType, ConnectorType<?>... connectorType) {
// TODO Auto-generated method stub
return null;
}
@Override
public PropertyContainer getPropertyContainer() {
return getNode();
}
@Override
protected VertexType getSpecialVertexType(){
return getType();
}
@Override
public EdgeType getType() {
if(relType == null){
relType = (EdgeType)getDb().getVertex(getDb().getNodeById((Long)getNode().getProperty(GraphDatabaseImpl.EDGE_TYPE)));
}
return relType;
}
@Override
public <U extends LeftRestrictedConnectionMode>Vertex getVertex(ConnectorType<U> connectorType) {
return getDb().getVertex(getNode().getSingleRelationship(DynamicRelationshipType.withName(getType().getName()+EDGEROLE_SEPARATOR+connectorType.getName()), Direction.OUTGOING).getEndNode());
}
@Override
public <T extends ConnectionMode> Iterable<Vertex> getVertices(ConnectorType<T> connectorType) {
return new ElementIterable(connectorType);
}
@Override
public boolean hasEdge(EdgeType edgeType, ConnectorType<?>... connectorType) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isType(EdgeType relType) {
return (relType.getNode().getId() == getType().getNode().getId());
}
}