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

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Here is the source code for com.evrythng.java.wrapper.mapping.BatchPopulatingTaskOutputParametersDeserializer.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.CsvAdiOutputParameters;
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 com.fasterxml.jackson.databind.deser.std.StdDeserializer;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

public class BatchPopulatingTaskOutputParametersDeserializer
        extends StdDeserializer<BatchPopulatingTask.OutputParameters> {

    private static final long serialVersionUID = -1219958118814469079L;

    public BatchPopulatingTaskOutputParametersDeserializer() {

        super(BatchPopulatingTask.InputParameters.class);
    }

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

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

    private Class<? extends BatchPopulatingTask.OutputParameters> classForType(
            final BatchPopulatingTask.OutputParameters.Type type) {

        switch (type) {
        case CSV:
            return CsvAdiOutputParameters.class;
        }
        throw new IllegalArgumentException("Unsupported adi generation output parameters type: " + type);
    }

    private <T> T getFieldValue(final JsonNode node) {

        if (node == null) {
            return null;
        }
        Object value = null;
        if (node.isBoolean()) {
            value = node.asBoolean();
        }
        if (node.isNumber()) {
            value = node.asDouble();
        }
        if (node.isTextual()) {
            value = node.asText();
        }
        if (node.isArray()) {
            value = new ArrayList<>();
        }
        if (node.isObject()) {
            value = new HashMap<>();
        }
        return (T) value;
    }
}