com.datastax.driver.dse.graph.DefaultPathDeserializer Maven / Gradle / Ivy

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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse.graph;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;

import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.Set;

import static com.fasterxml.jackson.core.JsonToken.*;

class DefaultPathDeserializer extends StdDeserializer {

    DefaultPathDeserializer() {
        super(DefaultPath.class);
    }

    @Override
    public DefaultPath deserialize(JsonParser parser, DeserializationContext ctx) throws IOException {
        assert parser.getCurrentToken() == START_OBJECT;
        DefaultPath path = new DefaultPath();
        while (parser.nextToken() != END_OBJECT) {
            assert parser.getCurrentToken() == FIELD_NAME;
            String name = parser.getCurrentName();
            parser.nextToken();
            if ("labels".equals(name)) {
                while (parser.nextToken() != END_ARRAY) {
                    assert parser.getCurrentToken() == START_ARRAY;
                    Set group = new LinkedHashSet();
                    while (parser.nextToken() != END_ARRAY) {
                        assert parser.getCurrentToken() == VALUE_STRING;
                        String label = parser.readValueAs(String.class);
                        group.add(label);
                    }
                    if (path.labels == null)
                        path.labels = new ArrayList>();
                    path.labels.add(group);
                }
            } else if ("objects".equals(name)) {
                assert parser.getCurrentToken() == START_ARRAY;
                while (parser.nextToken() != END_ARRAY) {
                    assert parser.getCurrentToken() == START_OBJECT;
                    JsonNode jacksonNode = parser.readValueAsTree();
                    if (path.objects == null)
                        path.objects = new ArrayList();
                    path.objects.add(new DefaultGraphNode(jacksonNode, (ObjectMapper) parser.getCodec()));
                }
            } else {
                parser.skipChildren();
            }
        }
        return path;
    }

}