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

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Here is the source code for com.evrythng.java.wrapper.mapping.CreateActionsJobInputDeserializer.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.action.jobs.creation.CreateActionJob;
import com.evrythng.thng.resource.model.store.action.jobs.creation.EvrythngIdsFileInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.EvrythngIdsListInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.EvrythngIdsPrivateFileInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ExternalIdsFileInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ExternalIdsListInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ExternalIdsPrivateFileInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ShortIdsFileInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ShortIdsListInput;
import com.evrythng.thng.resource.model.store.action.jobs.creation.ShortIdsPrivateFileInput;
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 final class CreateActionsJobInputDeserializer extends StdDeserializer<CreateActionJob.Input> {

    private static final long serialVersionUID = -5972944034677022833L;

    public CreateActionsJobInputDeserializer() {

        super(CreateActionJob.Input.class);
    }

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

        ObjectMapper mapper = JSONUtils.OBJECT_MAPPER;
        JsonNode node = mapper.readTree(jp);
        JsonNode typeNode = node.get(CreateActionJob.Input.FIELD_TYPE);
        if (typeNode == null) {
            throw new JsonMappingException("Cannot deserialize create actions job input without type field");
        }
        String typeRaw = getFieldValue(typeNode);
        JsonNode contentTypeNode = node.get(CreateActionJob.Input.FIELD_CONTENT_TYPE);
        if (contentTypeNode == null) {
            throw new JsonMappingException("Cannot deserialize create actions job input without contentType field");
        }
        String contentTypeRaw = getFieldValue(contentTypeNode);
        Class<? extends CreateActionJob.Input> subtypeClass = classForType(
                CreateActionJob.Input.Type.valueOf(typeRaw.toUpperCase()),
                CreateActionJob.Input.ContentType.valueOf(contentTypeRaw.toUpperCase()));
        return mapper.readValue(node.toString(), subtypeClass);
    }

    private Class<? extends CreateActionJob.Input> classForType(final CreateActionJob.Input.Type type,
            final CreateActionJob.Input.ContentType contentType) {

        switch (type) {
        case FILE:
            switch (contentType) {
            case EVRYTHNG_IDS:
                return EvrythngIdsFileInput.class;
            case EXTERNAL_IDS:
                return ExternalIdsFileInput.class;
            case SHORT_IDS:
                return ShortIdsFileInput.class;
            }
        case PRIVATE_FILE:
            switch (contentType) {
            case EVRYTHNG_IDS:
                return EvrythngIdsPrivateFileInput.class;
            case EXTERNAL_IDS:
                return ExternalIdsPrivateFileInput.class;
            case SHORT_IDS:
                return ShortIdsPrivateFileInput.class;
            }
        case LIST:
            switch (contentType) {
            case EVRYTHNG_IDS:
                return EvrythngIdsListInput.class;
            case EXTERNAL_IDS:
                return ExternalIdsListInput.class;
            case SHORT_IDS:
                return ShortIdsListInput.class;
            }
        }
        throw new IllegalArgumentException("Unsupported create actions job input 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;
    }
}