package org.neo4j.cineasts.service;
import org.neo4j.graphdb.Direction;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.index.IndexManager;
import org.neo4j.kernel.AbstractGraphDatabase;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* @author mh
* @since 02.03.11
*/
public class Neo4jDatabaseCleaner {
private AbstractGraphDatabase graph;
public Neo4jDatabaseCleaner(AbstractGraphDatabase graph) {
this.graph = graph;
}
public Map<String, Object> cleanDb() {
Map<String, Object> result = new HashMap<String, Object>();
Transaction tx = graph.beginTx();
try {
removeNodes(result);
clearIndex(result);
tx.success();
} finally {
tx.finish();
}
return result;
}
private void removeNodes(Map<String, Object> result) {
Node refNode = graph.getReferenceNode();
int nodes = 0, relationships = 0;
for (Node node : graph.getAllNodes()) {
for (Relationship rel : node.getRelationships(Direction.OUTGOING)) {
rel.delete();
relationships++;
}
if (!refNode.equals(node)) {
node.delete();
nodes++;
}
}
result.put("nodes", nodes);
result.put("relationships", relationships);
}
private void clearIndex(Map<String, Object> result) {
IndexManager indexManager = graph.index();
result.put("node-indexes", Arrays.asList(indexManager.nodeIndexNames()));
result.put("relationship-indexes", Arrays.asList(indexManager.relationshipIndexNames()));
for (String ix : indexManager.nodeIndexNames()) {
indexManager.forNodes(ix).delete();
}
for (String ix : indexManager.relationshipIndexNames()) {
indexManager.forRelationships(ix).delete();
}
}
}