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

There is a newer version: 2.0.53.android8

package com.alibaba.fastjson2.reader;

import com.alibaba.fastjson2.JSONReader;
import com.alibaba.fastjson2.schema.JSONSchema;
import com.alibaba.fastjson2.util.TypeUtils;

import java.lang.reflect.Method;
import java.util.function.ObjDoubleConsumer;

final class FieldReaderDoubleValueFunc
        extends FieldReader {
    final ObjDoubleConsumer function;

    public FieldReaderDoubleValueFunc(String fieldName, int ordinal, Double defaultValue, JSONSchema schema, Method method, ObjDoubleConsumer function) {
        super(fieldName, double.class, double.class, ordinal, 0, null, null, defaultValue, schema, method, null);
        this.function = function;
    }

    @Override
    public void accept(T object, double value) {
        if (schema != null) {
            schema.assertValidate(value);
        }

        function.accept(object, value);
    }

    @Override
    public void accept(T object, Object value) {
        double doubleValue = TypeUtils.toDoubleValue(value);

        if (schema != null) {
            schema.assertValidate(doubleValue);
        }

        function.accept(object,
                doubleValue);
    }

    @Override
    public void readFieldValue(JSONReader jsonReader, T object) {
        double value = jsonReader.readDoubleValue();

        if (schema != null) {
            schema.assertValidate(value);
        }

        function.accept(object, value);
    }

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