com.livk.commons.expression.ConverterExpressionResolver Maven / Gradle / Ivy
/*
* Copyright 2021-2024 spring-boot-extension the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.livk.commons.expression;
import org.springframework.util.Assert;
/**
* The type Converter expression resolver.
*
* @param the type parameter
* @param the type parameter
* @author livk
* @see com.livk.commons.expression.jexl3.JexlExpressionResolver
* @see com.livk.commons.expression.mvel2.MvelExpressionResolver
* @see com.livk.commons.expression.spring.SpringExpressionResolver
*/
public abstract class ConverterExpressionResolver extends CacheExpressionResolver {
@Override
protected final T calculate(E expression, Context context, Class returnType) {
C frameworkContext = transform(context);
Assert.notNull(frameworkContext, "frameworkContext not be null");
return calculate(expression, frameworkContext, returnType);
}
/**
* 从Context装换成框架的上下文
* @param context context
* @return the c
*/
protected abstract C transform(Context context);
/**
* 对表达式进行计算
* @param 泛型
* @param expression 表达式
* @param context 上下文
* @param returnType 返回类型
* @return 计算结果相关实例
*/
protected abstract T calculate(E expression, C context, Class returnType);
}