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FastChar is Web+ORM Framework in Java.

There is a newer version: 2.2.2

package com.fastchar.object;

import com.fastchar.utils.FastNumberUtils;
import com.fastchar.utils.FastStringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 表达式读取对象的值
 *
 * @author 沈建（Janesen）
 * @date 2021/8/20 10:02
 */
public class FastObjectExecute {
    private static final Pattern ATTR_PATTERN = Pattern.compile("\\$\\{(.*)}");
    private static final Pattern EXTRACT_PATTERN = Pattern.compile("(.*)\\[(\\d+)]");
    private transient final Object value;

    public FastObjectExecute(Object value) {
        this.value = value;
    }

    public Object execute(String expression) {
        return executeProperty(expression).getValue();
    }

    public FastObjectProperty executeProperty(String expression) {
        if (FastStringUtils.isEmpty(expression)) {
            return new FastObjectProperty(value, expression);
        }
        Matcher matcher = ATTR_PATTERN.matcher(expression);
        if (matcher.find()) {
            List