things.thing.ThingDeserializer.java Source code

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Here is the source code for things.thing.ThingDeserializer.java

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/*
 * Things
 *
 * Copyright (c) 2014, Markus Binsteiner. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */

package things.thing;

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.JsonDeserializer;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import things.types.TypeRegistry;

import java.io.IOException;

/**
 * Project: things
 * <p>
 * Written by: Markus Binsteiner
 * Date: 31/03/14
 * Time: 12:28 PM
 */
public class ThingDeserializer extends JsonDeserializer<Thing> {

    private final ObjectMapper objectMapper;
    private final TypeRegistry tr;

    public ThingDeserializer(ObjectMapper om, TypeRegistry tr) {
        this.objectMapper = om;
        this.tr = tr;
    }

    @Override
    public Thing deserialize(JsonParser jp, DeserializationContext ctxt)
            throws IOException, JsonProcessingException {

        ObjectCodec oc = jp.getCodec();
        JsonNode node = null;
        node = oc.readTree(jp);

        JsonNode keyNode = node.get("key");
        String key = null;
        if (keyNode != null) {
            key = keyNode.asText();
        }

        JsonNode typeNode = node.get("type");
        String type = null;
        if (typeNode != null) {
            type = typeNode.asText();
        }

        String id = null;
        JsonNode idNode = node.get("id");
        if (idNode != null) {
            id = idNode.asText();
        }

        Thing t = new Thing();
        t.setKey(key);
        t.setId(id);
        t.setThingType(type);

        JsonNode valueNode = node.get("value");
        if (valueNode != null) {
            Object p = objectMapper.treeToValue(valueNode, tr.getTypeClass(type));
            t.setValue(p);
        }

        return t;
    }
}