Java Neo4j重新排列路径
Neo4j中是否存在(可能使用Java Neo4j重新排列路径,java,graph,neo4j,graph-theory,Java,Graph,Neo4j,Graph Theory,Neo4j中是否存在(可能使用PathExpander或RelationshipExpander)根据java中的关系属性(在我的例子中是时间戳)对遍历路径进行重新排序 我搜索了几乎所有的api和社区讨论,但找不到任何提示。您可以创建一个路径扩展程序,根据属性的值扩展路径,类似这样的内容(假设您想要递增的顺序) 您可以创建一个路径扩展程序,该扩展程序根据属性的值扩展路径,如下所示(假设需要递增顺序) public class OrderPathExpander implements PathEx
PathExpander
或RelationshipExpander
)根据java中的关系属性(在我的例子中是时间戳)对遍历路径进行重新排序
我搜索了几乎所有的api和社区讨论,但找不到任何提示。您可以创建一个路径扩展程序,根据属性的值扩展路径,类似这样的内容(假设您想要递增的顺序)
您可以创建一个路径扩展程序,该扩展程序根据属性的值扩展路径,如下所示(假设需要递增顺序)
public class OrderPathExpander implements PathExpander<String> {
private final RelationshipType relationshipType;
private final Direction direction;
public OrderPathExpander( RelationshipType relationshipType, Direction direction )
{
this.relationshipType = relationshipType;
this.direction = direction;
}
@Override
public Iterable<Relationship> expand(Path path, BranchState<String> state)
{
List<Relationship> results = new ArrayList<Relationship>();
if ( path.length() == 0 ) {
for ( Relationship r : path.endNode().getRelationships( relationshipType, direction ) )
{
results.add( r );
}
}
else {
for ( Relationship r : path.endNode().getRelationships( relationshipType, direction ) )
{
if ( r.getProperty("timestamp") >= (path.lastRelationship().getProperty("timestamp")) )
{
results.add( r );
}
}
}
return results;
}
@Override
public PathExpander<String> reverse()
{
return null;
}
TraversalDescription td = Traversal.description()
.breadthFirst()
.expand(new OrderPathExpander(YourRelationshipType, Direction.INCOMING))
.evaluator(new Evaluator() {...});