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

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Here is the source code for com.evrythng.java.wrapper.mapping.TaskResultDeserializer.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.java.wrapper.util.JSONUtils;
import com.evrythng.thng.resource.model.store.BatchPopulatingTask;
import com.evrythng.thng.resource.model.store.ShortIdGenerationTask;
import com.evrythng.thng.resource.model.store.TaskOnBatch;
import com.fasterxml.jackson.core.JsonParser;
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 java.io.IOException;

public class TaskResultDeserializer extends Deserializer<TaskOnBatch.BaseTaskResult> {

    public TaskResultDeserializer() {

        super(TaskOnBatch.BaseTaskResult.class);
    }

    @Override
    public TaskOnBatch.BaseTaskResult deserialize(final JsonParser jp, final DeserializationContext ctx)
            throws IOException {

        ObjectMapper mapper = JSONUtils.OBJECT_MAPPER;
        JsonNode node = mapper.readTree(jp);
        JsonNode typeNode = node.get(TaskOnBatch.FIELD_TYPE);
        if (typeNode == null) {
            throw new JsonMappingException("Cannot deserialize task result without type field");
        }
        String typeRaw = getFieldValue(typeNode);
        Class<? extends TaskOnBatch.BaseTaskResult> subtypeClass = classForType(
                TaskOnBatch.BaseTaskResult.Type.valueOf(typeRaw.toUpperCase()));
        return mapper.readValue(node.toString(), subtypeClass);
    }

    private Class<? extends TaskOnBatch.BaseTaskResult> classForType(final TaskOnBatch.BaseTaskResult.Type type) {

        switch (type) {
        case POPULATING:
            return BatchPopulatingTask.Result.class;
        case SHORT_ID_GENERATION:
            return ShortIdGenerationTask.Result.class;
        case ERROR:
            return TaskOnBatch.ErrorTaskResult.class;
        }
        throw new IllegalArgumentException("Unsupported task result type: " + type);
    }
}