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A Java Library for version 3 of the IIIF Presentation API

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package info.freelibrary.iiif.presentation.v3.properties;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import com.fasterxml.jackson.databind.node.ArrayNode;

/**
 * An abstract deserializer that our other deserializers can extend.
 *
 * @param  The class being deserialized
 */
abstract class AbstractI18nStdDeserializer extends StdDeserializer {

    /**
     * The serialVersionUID for AbstractI18nStdDeserializer.
     */
    private static final long serialVersionUID = 433758172553865194L;

    /**
     * Creates a new deserializer.
     */
    AbstractI18nStdDeserializer() {
        this(null);
    }

    /**
     * Creates a new deserializer.
     *
     * @param aClass A class
     */
    AbstractI18nStdDeserializer(final Class aClass) {
        super(aClass);
    }

    /**
     * Parses the I18n from a I18nProperty node.
     *
     * @param aPropertyNode A property that extends the I18nProperty class
     * @return An array of I18n
     */
    protected I18n[] getI18nStrings(final JsonNode aPropertyNode) {
        final Iterator> iterator = aPropertyNode.fields();
        final List i18n = new ArrayList<>();

        while (iterator.hasNext()) {
            final Entry entry = iterator.next();
            final JsonNode jsonNode = entry.getValue();

            if (jsonNode.isArray()) {
                final ArrayNode arrayNode = (ArrayNode) jsonNode;
                final List langStrings = new ArrayList<>();

                for (int index = 0; index < arrayNode.size(); index++) {
                    langStrings.add(arrayNode.get(index).asText());
                }

                i18n.add(new I18n(entry.getKey(), langStrings));
            }
        }

        return i18n.toArray(new I18n[0]);
    }
}