com.evrythng.java.wrapper.mapping.GeoJsonDeserializerImpl.java Source code

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Here is the source code for com.evrythng.java.wrapper.mapping.GeoJsonDeserializerImpl.java

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/*
 * (c) Copyright Reserved EVRYTHNG Limited 2016. All rights reserved.
 * Use of this material is subject to license.
 * Copying and unauthorised use of this material strictly prohibited.
 */
package com.evrythng.java.wrapper.mapping;

import com.evrythng.thng.resource.model.store.geojson.GeoJson;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.ObjectCodec;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;

import java.io.IOException;

/**
 * GeoJSON deserializer.
 * 
 **/
public class GeoJsonDeserializerImpl extends TypeMapDeserializer<GeoJson> implements GeoJsonDeserializer {

    private static final long serialVersionUID = 1L;

    GeoJsonDeserializerImpl() {
        super(GeoJson.class, GeoJson.FIELD_TYPE);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public <T extends GeoJson> String getGeoJsonType(Class<T> geoJsonClass) {
        return getObjectType(geoJsonClass);
    }

    @Override
    public GeoJson deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        ObjectCodec codec = jp.getCodec();
        ObjectMapper mapper = (ObjectMapper) codec;
        ObjectNode root = (ObjectNode) mapper.readTree(jp);
        JsonNode type = root.get(getTypeFieldName());
        if (type == null) {
            throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
        }
        String sType = type.textValue();
        if (sType == null || sType.isEmpty()) {
            throw new IllegalArgumentException(this.getValueClass().getSimpleName() + " type cannot be empty.");
        }

        Class<GeoJson> clazz = (Class<GeoJson>) resolveClass(sType);

        GeoJson obj = codec.treeToValue(root, clazz);
        if (obj == null) {
            throw new IllegalArgumentException(
                    this.getValueClass().getSimpleName() + " type deserialised as null: " + root.toString());
        }
        return obj;
    }
}