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A library provides facade api for data accessing.

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package net.cassite.daf4j.stream;

import net.cassite.daf4j.*;

/**
 * Stream风格的查询,由QueryStream的mapToDouble开启.

 * 包含Double类型的Stream

 * 额外提供sum,average,max,min方法.

 * 此外,若实体未实现SortedEntity,那么将使用构造时传入的DataComparable.asc作排序依据
 *
 * @param  实体类型
 * @see QueryStream#mapToDouble(DataComparable)
 * @see DataComparable#asc()
 */
public class QueryDoubleStream extends QueryNumStreamBase> {
        protected QueryDoubleStream(E entity, DataAccess dataAccess, AndOr andOr, QueryParameter parameter, DataComparable doubleData) {
                super(entity, dataAccess, andOr, parameter, doubleData);
        }

        /**
         * 执行求和操作
         *
         * @return double类型的求和结果
         */
        public double sum() {
                return DataUtils.executeSumDouble(entity, andOr, parameter, data, dataAccess);
        }

        /**
         * 执行平均值操作
         *
         * @return double类型的平均值
         */
        public double average() {
                return DataUtils.executeAvg(entity, andOr, parameter, data, dataAccess);
        }

        /**
         * 执行求最大值操作
         *
         * @return double类型的最大值
         */
        public double max() {
                return DataUtils.executeMaxDouble(entity, andOr, parameter, data, dataAccess);
        }

        /**
         * 执行求最小值操作
         *
         * @return double类型的最小值
         */
        public double min() {
                return DataUtils.executeMinDouble(entity, andOr, parameter, data, dataAccess);
        }
}