de.upb.wdqa.wdvd.datamodel.oldjson.jackson.deserializers.OldJacksonSnakDeserializer.java Source code

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Here is the source code for de.upb.wdqa.wdvd.datamodel.oldjson.jackson.deserializers.OldJacksonSnakDeserializer.java

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/*
 * Wikidata Vandalism Detector 2016 (WDVD-2016)
 * 
 * Copyright (c) 2016 Stefan Heindorf, Martin Potthast, Benno Stein, Gregor Engels
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package de.upb.wdqa.wdvd.datamodel.oldjson.jackson.deserializers;

import java.io.IOException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.wikidata.wdtk.datamodel.json.jackson.datavalues.JacksonValue;

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

import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.OldJacksonNoValueSnak;
import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.OldJacksonSnak;
import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.OldJacksonSomeValueSnak;
import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.OldJacksonValueSnak;
import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.datavalues.OldJacksonValue;
import de.upb.wdqa.wdvd.datamodel.oldjson.jackson.datavalues.OldJacksonValueItemId;

public class OldJacksonSnakDeserializer extends StdDeserializer<OldJacksonSnak> {

    static final Logger logger = LoggerFactory.getLogger(OldJacksonSnakDeserializer.class);

    private static final long serialVersionUID = 1L;

    public OldJacksonSnakDeserializer() {
        super(OldJacksonSnakDeserializer.class);
    }

    @Override
    public OldJacksonSnak deserialize(JsonParser p, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {
        OldJacksonSnak result = null;

        if (!p.getCurrentToken().equals(JsonToken.START_ARRAY)) {
            logger.warn("Token " + JsonToken.START_ARRAY + " expected");
        }

        p.nextToken();
        String type = p.getText();
        p.nextToken();

        // determine type
        if (type.equals("value")) {
            OldJacksonValueSnak valuesnak = new OldJacksonValueSnak();
            valuesnak.setProperty("P" + p.getIntValue());
            p.nextToken();
            valuesnak.setDatatype(p.getText());
            p.nextToken();

            ObjectMapper mapper = (ObjectMapper) p.getCodec();
            JsonNode root = mapper.readTree(p);
            Class<? extends OldJacksonValue> valueClass = getValueClass(valuesnak.getDatatype());
            if (valueClass != null) {
                valuesnak.setDatavalue(mapper.treeToValue(root, valueClass));
            }

            p.nextToken();

            result = valuesnak;
        } else if (type.equals("novalue")) {
            result = new OldJacksonNoValueSnak();
            result.setProperty("P" + p.getIntValue());
            p.nextToken();
        } else if (type.equals("somevalue")) {
            result = new OldJacksonSomeValueSnak();
            result.setProperty("P" + p.getIntValue());
            p.nextToken();
        } else {
            logger.warn("Unknown value type: " + type);
        }

        if (!p.getCurrentToken().equals(JsonToken.END_ARRAY)) {
            logger.warn("Token " + JsonToken.END_ARRAY + " expected");
        }

        return result;
    }

    private Class<? extends OldJacksonValue> getValueClass(String datatype) throws JsonMappingException {

        switch (datatype) {
        case JacksonValue.JSON_VALUE_TYPE_ENTITY_ID:
            return OldJacksonValueItemId.class;
        case JacksonValue.JSON_VALUE_TYPE_STRING:
            //         return JacksonValueString.class;
            return null;
        case JacksonValue.JSON_VALUE_TYPE_TIME:
            //         return JacksonValueTime.class;
            return null;
        case JacksonValue.JSON_VALUE_TYPE_GLOBE_COORDINATES:
            //         return JacksonValueGlobeCoordinates.class;
            return null;
        case JacksonValue.JSON_VALUE_TYPE_QUANTITY:
            //         return JacksonValueQuantity.class;
            return null;
        case JacksonValue.JSON_VALUE_TYPE_MONOLINGUAL_TEXT:
            //         return JacksonValueMonolingualText.class;
            return null;
        case "bad":
            // Some snaks have the datatype "bad".
            logger.debug("Bad data type");
            return null;
        default:
            logger.warn("Unknown data type: \"" + datatype + "\"");

            return null;
        }
    }

}