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/*******************************************************************************
* Copyright (c) 2017 Politecnico di Torino and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution, and is available at
* http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
package it.polito.verigraph.deserializer;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.TypeFactory;
import it.polito.verigraph.exception.BadRequestException;
import it.polito.verigraph.exception.InternalServerErrorException;
import it.polito.verigraph.model.Graph;
import it.polito.verigraph.model.Node;
/**
* The Class GraphCustomDeserializer is a custom deserializer for a Graph object
*/
public class GraphCustomDeserializer extends JsonDeserializer<Graph>{
/* (non-Javadoc)
* @see com.fasterxml.jackson.databind.JsonDeserializer#deserialize(com.fasterxml.jackson.core.JsonParser, com.fasterxml.jackson.databind.DeserializationContext)
*/
@Override
public Graph deserialize(JsonParser jp, DeserializationContext context){
JsonNode root = null;
try {
root = jp.getCodec().readTree(jp);
}
catch (JsonProcessingException e) {
throw new InternalServerErrorException("Error parsing a graph: " + e.getMessage());
}
catch (IOException e) {
throw new InternalServerErrorException("I/O error parsing a graph: " + e.getMessage());
}
JsonNode nodesJson = root.get("nodes");
if(nodesJson == null)
throw new BadRequestException("Invalid graph");
List<Node> nodeList = null;
try {
nodeList = new ObjectMapper().readValue(nodesJson.toString(), TypeFactory.defaultInstance().constructCollectionType(List.class, Node.class));
}
catch (JsonParseException e) {
throw new BadRequestException("Invalid content for a graph: " + e.getMessage());
}
catch (JsonMappingException e) {
throw new BadRequestException("Invalid input json structure for a graph: " + e.getMessage());
}
catch (IOException e) {
throw new InternalServerErrorException("I/O error parsing a graph: " + e.getMessage());
}
Graph graph = new Graph();
if(root.get("id") != null){
long graphId = root.get("id").asLong();
graph.setId(graphId);
}
Map<Long, Node> nodes = graph.getNodes();
long numberOfNodes = 0;
for (Node node : nodeList){
nodes.put(++numberOfNodes, node);
}
return graph;
}
}
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