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

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package com.alibaba.fastjson2.writer;

import com.alibaba.fastjson2.JSONWriter;
import com.alibaba.fastjson2.function.ToCharFunction;

import java.lang.reflect.Method;

final class FieldWriterCharValFunc
        extends FieldWriter {
    final ToCharFunction function;

    FieldWriterCharValFunc(
            String fieldName,
            int ordinal,
            long features,
            String format,
            String label,
            Method method,
            ToCharFunction function
    ) {
        super(fieldName, ordinal, features, format, label, char.class, char.class, null, method);
        this.function = function;
    }

    @Override
    public Object getFieldValue(Object object) {
        return function.applyAsChar(object);
    }

    @Override
    public void writeValue(JSONWriter jsonWriter, Object object) {
        char value = function.applyAsChar(object);
        jsonWriter.writeChar(value);
    }

    @Override
    public boolean write(JSONWriter jsonWriter, Object object) {
        char value = function.applyAsChar(object);
        writeFieldName(jsonWriter);
        jsonWriter.writeChar(value);
        return true;
    }
}