/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tinkerpop.gremlin.process.computer.bulkloading;
import org.apache.commons.configuration.Configuration;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Edge;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.T;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.structure.VertexProperty;
/**
* {@link org.apache.tinkerpop.gremlin.process.computer.bulkloading.OneTimeBulkLoader} is a
* {@link org.apache.tinkerpop.gremlin.process.computer.bulkloading.BulkLoader} implementation that should be used
* for initial bulk loads. In contrast to {@link org.apache.tinkerpop.gremlin.process.computer.bulkloading.IncrementalBulkLoader}
* it doesn't store temporary identifiers in the write graph nor does it attempt to find existing elements, instead it
* only clones each element from the source graph.
*
* @author Daniel Kuppitz (http://gremlin.guru)
*/
public class OneTimeBulkLoader implements BulkLoader {
private boolean userSuppliedIds = false;
/**
* Creates a clone of the given vertex in the given graph.
*/
@Override
public Vertex getOrCreateVertex(final Vertex vertex, final Graph graph, final GraphTraversalSource g) {
final GraphTraversal<Vertex, Vertex> t = g.addV(vertex.label());
return (useUserSuppliedIds() ? t.property(T.id, vertex.id()) : t).next();
}
/**
* Creates a clone of the given edge between the given in- and out-vertices.
*/
@Override
public Edge getOrCreateEdge(final Edge edge, final Vertex outVertex, final Vertex inVertex, final Graph graph, final GraphTraversalSource g) {
return createEdge(edge, outVertex, inVertex, graph, g);
}
/**
* Creates a clone of the given property for the given vertex.
*/
@Override
public VertexProperty getOrCreateVertexProperty(final VertexProperty<?> property, final Vertex vertex, final Graph graph, final GraphTraversalSource g) {
return createVertexProperty(property, vertex, graph, g);
}
/**
* {@inheritDoc}
*/
@Override
public Vertex getVertex(final Vertex vertex, final Graph graph, final GraphTraversalSource g) {
return getVertexById(vertex.id(), graph, g);
}
/**
* {@inheritDoc}
*/
@Override
public boolean useUserSuppliedIds() {
return userSuppliedIds;
}
/**
* Always returns false.
*/
@Override
public boolean keepOriginalIds() {
return false;
}
/**
* Always returns null.
*/
@Override
public String getVertexIdProperty() {
return null;
}
/**
* {@inheritDoc}
*/
@Override
public void configure(final Configuration configuration) {
if (configuration.containsKey(BulkLoaderVertexProgram.USER_SUPPLIED_IDS_CFG_KEY)) {
userSuppliedIds = configuration.getBoolean(BulkLoaderVertexProgram.USER_SUPPLIED_IDS_CFG_KEY);
}
}
}