package com.tinkerpop.gremlin.neo4j.process.graph.step.util;
import com.tinkerpop.gremlin.neo4j.structure.Neo4jEdge;
import com.tinkerpop.gremlin.neo4j.structure.Neo4jGraph;
import com.tinkerpop.gremlin.neo4j.structure.Neo4jVertex;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.ResourceIterator;
import java.util.Iterator;
import java.util.Map;
import java.util.stream.Collectors;
/**
* @author Stephen Mallette (http://stephen.genoprime.com)
*/
public class Neo4jCypherIterator<T> implements Iterator<Map<String, T>> {
private final ResourceIterator<Map<String, T>> iterator;
private final Neo4jGraph graph;
public Neo4jCypherIterator(final ResourceIterator<Map<String, T>> iterator, final Neo4jGraph graph) {
this.iterator = iterator;
this.graph = graph;
}
@Override
public boolean hasNext() {
return this.iterator.hasNext();
}
@Override
public Map<String, T> next() {
return this.iterator.next().entrySet().stream().collect(Collectors.toMap(
Map.Entry::getKey,
entry -> {
final T val = entry.getValue();
if (Node.class.isAssignableFrom(val.getClass())) {
return (T) new Neo4jVertex((Node) val, this.graph);
} else if (Relationship.class.isAssignableFrom(val.getClass())) {
return (T) new Neo4jEdge((Relationship) val, this.graph);
} else {
return val;
}
}));
}
}