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package com.firefly.utils.json.parser;

import com.firefly.utils.exception.CommonRuntimeException;
import com.firefly.utils.json.JsonReader;
import com.firefly.utils.json.exception.JsonException;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.Map;

public class MapParser extends ComplexTypeParser {

    public MapParser(Type elementType) {
        super(elementType);
    }

    @Override
    @SuppressWarnings({"rawtypes", "unchecked"})
    public Object convertTo(JsonReader reader, Class clazz) throws IOException {
        if (reader.isNull())
            return null;

        if (!reader.isObject())
            throw new JsonException("json string is not object format");

        Map obj = null;
        try {
            obj = (Map) clazz.newInstance();
        } catch (Throwable e) {
            throw new CommonRuntimeException(e);
        }

        if (reader.isEmptyObject())
            return obj;

        for (; ; ) {
            String key = reader.readString();
            if (!reader.isColon())
                throw new JsonException("missing ':'");

            obj.put(key, elementMetaInfo.getValue(reader));

            char ch = reader.readAndSkipBlank();
            if (ch == '}')
                return obj;

            if (ch != ',')
                throw new JsonException("missing ','");
        }
    }

}