001/*
002 *    Copyright 2024-2025, Warm-Flow (290631660@qq.com).
003 *
004 *    Licensed under the Apache License, Version 2.0 (the "License");
005 *    you may not use this file except in compliance with the License.
006 *    You may obtain a copy of the License at
007 *
008 *       https://www.apache.org/licenses/LICENSE-2.0
009 *
010 *    Unless required by applicable law or agreed to in writing, software
011 *    distributed under the License is distributed on an "AS IS" BASIS,
012 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *    See the License for the specific language governing permissions and
014 *    limitations under the License.
015 */
016package org.dromara.warm.flow.core.utils;
017
018import org.dromara.warm.flow.core.constant.ExceptionCons;
019import org.dromara.warm.flow.core.exception.FlowException;
020import org.dromara.warm.flow.core.expression.*;
021
022import java.util.HashMap;
023import java.util.Map;
024import java.util.concurrent.atomic.AtomicBoolean;
025
026/**
027 * 条件表达式工具类
028 *
029 * @author warm
030 */
031public class ExpressionUtil {
032
033    private static final Map<String, ExpressionStrategy> map = new HashMap<>();
034
035    private ExpressionUtil() {
036    }
037
038    static {
039        setExpression(new ExpressionStrategyEq());
040        setExpression(new ExpressionStrategyGe());
041        setExpression(new ExpressionStrategyGt());
042        setExpression(new ExpressionStrategyLe());
043        setExpression(new ExpressionStrategyLike());
044        setExpression(new ExpressionStrategyLt());
045        setExpression(new ExpressionStrategyNe());
046        setExpression(new ExpressionStrategyNotLike());
047    }
048
049    public static void setExpression(ExpressionStrategy expressionStrategy) {
050        map.put(expressionStrategy.getType(), expressionStrategy);
051    }
052
053    /**
054     * @param expression 条件表达式，比如“@@eq@@|flag@@eq@@4” ，或者自定义策略
055     * @param variable
056     * @return
057     */
058    public static boolean eval(String expression, Map<String, Object> variable) {
059        if (StringUtils.isEmpty(expression)) {
060            return true;
061        }
062        AtomicBoolean flag = new AtomicBoolean(false);
063        map.forEach((k, v) -> {
064            if (expression.startsWith(k + "|")) {
065                if (v == null) {
066                    throw new FlowException(ExceptionCons.NULL_EXPRESSION_STRATEGY);
067                }
068                flag.set(v.eval(expression.replace(k + "|", ""), variable));
069            }
070        });
071        return flag.get();
072    }
073
074}