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Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

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package com.alibaba.fastjson2.reader;

import com.alibaba.fastjson2.JSONException;
import com.alibaba.fastjson2.JSONReader;

import java.lang.reflect.Method;
import java.util.Locale;
import java.util.function.BiConsumer;

final class FieldReaderStringFunc
        extends FieldReader {
    final BiConsumer function;

    final String format;
    final boolean trim;
    final boolean upper;

    FieldReaderStringFunc(
            String fieldName,
            Class fieldClass,
            int ordinal,
            long features,
            String format,
            Locale locale,
            Object defaultValue,
            Method method,
            BiConsumer function
    ) {
        super(fieldName, fieldClass, fieldClass, ordinal, features, format, locale, defaultValue, method, null);
        this.function = function;

        this.format = format;
        trim = "trim".equals(format) || (features & JSONReader.Feature.TrimString.mask) != 0;
        upper = "upper".equals(format);
    }

    @Override
    public void accept(T object, int value) {
        accept(object, Integer.toString(value));
    }

    @Override
    public void accept(T object, long value) {
        accept(object, Long.toString(value));
    }

    @Override
    public void accept(T object, Object value) {
        String fieldValue;
        if (value instanceof String || value == null) {
            fieldValue = (String) value;
        } else {
            fieldValue = value.toString();
        }

        if (fieldValue != null) {
            if (trim) {
                fieldValue = fieldValue.trim();
            }
            if (upper) {
                fieldValue = fieldValue.toUpperCase();
            }
        }

        try {
            function.accept(object, (V) fieldValue);
        } catch (Exception e) {
            throw new JSONException("set " + super.toString() + " error", e);
        }
    }

    @Override
    public void readFieldValue(JSONReader jsonReader, T object) {
        String fieldValue = jsonReader.readString();
        if (fieldValue != null) {
            if (trim) {
                fieldValue = fieldValue.trim();
            }
            if (upper) {
                fieldValue = fieldValue.toUpperCase();
            }
        }
        function.accept(object, (V) fieldValue);
    }

    @Override
    public Object readFieldValue(JSONReader jsonReader) {
        return jsonReader.readString();
    }

    public boolean supportAcceptType(Class valueClass) {
        return true;
    }
}