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Diffstat (limited to 'verigraph/src/it/polito/verigraph/deserializer/GraphCustomDeserializer.java')
| -rw-r--r-- | verigraph/src/it/polito/verigraph/deserializer/GraphCustomDeserializer.java | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/verigraph/src/it/polito/verigraph/deserializer/GraphCustomDeserializer.java b/verigraph/src/it/polito/verigraph/deserializer/GraphCustomDeserializer.java new file mode 100644 index 0000000..19245c2 --- /dev/null +++ b/verigraph/src/it/polito/verigraph/deserializer/GraphCustomDeserializer.java @@ -0,0 +1,86 @@ +/******************************************************************************* + * 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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