/*
* 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
*
* 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.streams.neo4j;
import org.apache.streams.core.StreamsDatum;
import org.apache.streams.jackson.StreamsJacksonMapper;
import org.apache.streams.neo4j.bolt.Neo4jBoltPersistWriter;
import org.apache.streams.pojo.json.Activity;
import org.apache.streams.pojo.json.ActivityObject;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import org.apache.commons.lang3.StringUtils;
import org.javatuples.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Created by steve on 1/2/17.
*/
public class Neo4jPersistUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(Neo4jBoltPersistWriter.class);
private static ObjectMapper mapper = StreamsJacksonMapper.getInstance();
private static CypherQueryGraphHelper helper = new CypherQueryGraphHelper();
public static List<Pair<String, Map<String, Object>>> prepareStatements(StreamsDatum entry) throws Exception {
List<Pair<String, Map<String, Object>>> statements = new ArrayList<>();
String id = entry.getId();
Activity activity = null;
ActivityObject activityObject = null;
Object document = entry.getDocument();
if (document instanceof Activity) {
activity = (Activity) document;
} else if (document instanceof ActivityObject) {
activityObject = (ActivityObject) document;
} else {
ObjectNode objectNode;
if (document instanceof ObjectNode) {
objectNode = (ObjectNode) document;
} else if ( document instanceof String) {
try {
objectNode = mapper.readValue((String) document, ObjectNode.class);
} catch (IOException ex) {
LOGGER.error("Can't handle input: ", entry);
throw ex;
}
} else {
LOGGER.error("Can't handle input: ", entry);
throw new Exception("Can't create statements from datum.");
}
if ( objectNode.get("verb") != null ) {
try {
activity = mapper.convertValue(objectNode, Activity.class);
activityObject = activity.getObject();
} catch (Exception ex) {
activityObject = mapper.convertValue(objectNode, ActivityObject.class);
}
} else {
activityObject = mapper.convertValue(objectNode, ActivityObject.class);
}
}
Preconditions.checkArgument(activity != null ^ activityObject != null);
if ( activityObject != null && !Strings.isNullOrEmpty(activityObject.getId())) {
statements.add(vertexStatement(activityObject));
} else if ( activity != null && !Strings.isNullOrEmpty(activity.getId())) {
statements.addAll(vertexStatements(activity));
statements.addAll(edgeStatements(activity));
}
return statements;
}
public static List<Pair<String, Map<String, Object>>> vertexStatements(Activity activity) {
List<Pair<String, Map<String, Object>>> statements = new ArrayList<>();;
ActivityObject actor = activity.getActor();
ActivityObject object = activity.getObject();
ActivityObject target = activity.getTarget();
if (actor != null && StringUtils.isNotBlank(actor.getId())) {
Pair<String, Map<String, Object>> actorStatement = vertexStatement(actor);
statements.add(actorStatement);
}
if (object != null && StringUtils.isNotBlank(object.getId())) {
Pair<String, Map<String, Object>> objectStatement = vertexStatement(object);
statements.add(objectStatement);
}
if (target != null && StringUtils.isNotBlank(target.getId())) {
Pair<String, Map<String, Object>> targetStatement = vertexStatement(target);
statements.add(targetStatement);
}
return statements;
}
public static List<Pair<String, Map<String, Object>>> edgeStatements(Activity activity) {
List<Pair<String, Map<String, Object>>> statements = new ArrayList<>();;
ActivityObject actor = activity.getActor();
ActivityObject object = activity.getObject();
ActivityObject target = activity.getTarget();
if (StringUtils.isNotBlank(actor.getId()) && object != null && StringUtils.isNotBlank(object.getId())) {
Pair<String, Map<String, Object>> actorObjectEdgeStatement = helper.createActorObjectEdge(activity);
Map<String, Object> props = new HashMap<>();
props.put("props", actorObjectEdgeStatement.getValue1());
actorObjectEdgeStatement = actorObjectEdgeStatement.setAt1(props);
statements.add(actorObjectEdgeStatement);
}
if (StringUtils.isNotBlank(actor.getId()) && target != null && StringUtils.isNotBlank(target.getId())) {
Pair<String, Map<String, Object>> actorTargetEdgeStatement = helper.createActorTargetEdge(activity);
Map<String, Object> props = new HashMap<>();
props.put("props", actorTargetEdgeStatement.getValue1());
actorTargetEdgeStatement = actorTargetEdgeStatement.setAt1(props);
statements.add(actorTargetEdgeStatement);
}
return statements;
}
public static Pair<String, Map<String, Object>> vertexStatement(ActivityObject activityObject) {
Pair<String, Map<String, Object>> mergeVertexRequest = helper.mergeVertexRequest(activityObject);
Map<String, Object> props = new HashMap<>();
props.put("props", mergeVertexRequest.getValue1());
mergeVertexRequest = mergeVertexRequest.setAt1(props);
return mergeVertexRequest;
}
}