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Nepxion Discovery is an enhancement for Spring Cloud Discovery

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package com.nepxion.discovery.plugin.strategy.condition;

/**
 * Title: Nepxion Discovery
 * Description: Nepxion Discovery
 * Copyright: Copyright (c) 2017-2050
 * Company: Nepxion
 * @author Haojun Ren
 * @version 1.0
 */

import java.util.Map;

import org.springframework.expression.ExpressionParser;
import org.springframework.expression.TypeComparator;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

public class ExpressionStrategyResolver {
    private static final ExpressionParser EXPRESSION_PARSER = new SpelExpressionParser();

    public static boolean eval(String expression, String key, Map map, TypeComparator typeComparator) {
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.setTypeComparator(typeComparator);
        context.setVariable(key, map);

        return eval(expression, context);
    }

    public static boolean eval(String expression, Map> map, TypeComparator typeComparator) {
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.setTypeComparator(typeComparator);
        for (Map.Entry> entry : map.entrySet()) {
            context.setVariable(entry.getKey(), entry.getValue());
        }

        return eval(expression, context);
    }

    public static boolean eval(String expression, StandardEvaluationContext context) {
        try {
            Boolean result = EXPRESSION_PARSER.parseExpression(expression).getValue(context, Boolean.class);

            return result != null ? result.booleanValue() : false;
        } catch (Exception e) {
            return false;
        }
    }
}