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There is a newer version: 1.1.71

package com.whaleal.icefrog.extra.expression.engine;

import com.whaleal.icefrog.core.lang.Singleton;
import com.whaleal.icefrog.core.util.ServiceLoaderUtil;
import com.whaleal.icefrog.core.util.StrUtil;
import com.whaleal.icefrog.extra.expression.ExpressionEngine;
import com.whaleal.icefrog.extra.expression.ExpressionException;
import com.whaleal.icefrog.log.StaticLog;

/**
 * 表达式语言引擎工厂类，，用于根据用户引入的表达式jar，自动创建对应的引擎对象
 *
 * @author looly
 */
public class ExpressionFactory {

    /**
     * 获得单例的{@link ExpressionEngine}
     *
     * @return 单例的{@link ExpressionEngine}
     */
    public static ExpressionEngine get() {
        return Singleton.get(ExpressionEngine.class.getName(), ExpressionFactory::create);
    }

    /**
     * 根据用户引入的表达式引擎jar，自动创建对应的拼音引擎对象

     * 推荐创建的引擎单例使用，此方法每次调用会返回新的引擎
     *
     * @return {@link ExpressionEngine}
     */
    public static ExpressionEngine create() {
        final ExpressionEngine engine = doCreate();
        StaticLog.debug("Use [{}] Engine As Default.", StrUtil.removeSuffix(engine.getClass().getSimpleName(), "Engine"));
        return engine;
    }

    /**
     * 根据用户引入的拼音引擎jar，自动创建对应的拼音引擎对象

     * 推荐创建的引擎单例使用，此方法每次调用会返回新的引擎
     *
     * @return {@link ExpressionEngine}
     */
    private static ExpressionEngine doCreate() {
        final ExpressionEngine engine = ServiceLoaderUtil.loadFirstAvailable(ExpressionEngine.class);
        if (null != engine) {
            return engine;
        }

        throw new ExpressionException("No expression jar found ! Please add one of it to your project !");
    }
}