de.undercouch.citeproc.helper.json.MapJsonBuilder Maven / Gradle / Ivy

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package de.undercouch.citeproc.helper.json;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * A JSON builder that creates maps that represent JSON objects
 * @author Michel Kraemer
 */
public class MapJsonBuilder implements JsonBuilder {
    private final JsonBuilderFactory factory;
    private final Map m;

    /**
     * Creates a JSON builder
     * @param factory the factory that created this builder
     */
    public MapJsonBuilder(JsonBuilderFactory factory) {
        this.factory = factory;
        m = new LinkedHashMap<>();
    }

    @Override
    public JsonBuilder add(String name, Object o) {
        m.put(name, toJson(o, factory));
        return this;
    }

    @Override
    public Map build() {
        return m;
    }

    @Override
    public Object toJson(Object arr) {
        return toJson(arr, factory);
    }

    /**
     * Converts an object to a JSON object
     * @param obj the object to convert
     * @param factory a factory used to create JSON builders
     * @return the JSON object
     */
    private static Object toJson(Object obj, JsonBuilderFactory factory) {
        if (obj instanceof JsonObject) {
            return ((JsonObject)obj).toJson(factory.createJsonBuilder());
        } else if (obj.getClass().isArray()) {
            List