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A library provides facade api for data accessing.
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package net.cassite.daf4j;

import net.cassite.daf4j.stream.QueryStream;

/**
 * 可放入where中作为条件一部分的参数

 * e.g. name.$eq('cass')
 */
public abstract class Parameter {

        /**
         * 该字段与给定值相等
         *
         * @param obj 要判断相等的对象
         * @return 条件
         */
        public Condition $eq(Object obj) {
                return new Condition(this, ConditionTypes.eq, new Object[]{obj});
        }

        /**
         * 该字段与给定值不相等
         *
         * @param obj 要判断不相等的对象
         * @return 条件
         */
        public Condition $ne(Object obj) {
                return new Condition(this, ConditionTypes.ne, new Object[]{obj});
        }

        /**
         * 该字段存在于子查询中
         *
         * @param query 子查询
         * @return 条件
         */
        public Condition in(PreResult query) {
                return new Condition(this, ConditionTypes.in, new Object[]{query});
        }

        /**
         * 该字段存在于子查询中
         *
         * @param query 子查询
         * @return 条件
         */
        public Condition in(QueryStream query) {
                return in(query.toPreRes());
        }

        /**
         * 该字段不存在于子查询中
         *
         * @param query 子查询
         * @return 条件
         */
        public Condition notIn(PreResult query) {
                return new Condition(this, ConditionTypes.notIn, new Object[]{query});
        }

        /**
         * 该字段不存在于子查询中
         *
         * @param query 子查询
         * @return 条件
         */
        public Condition notIn(QueryStream query) {
                return notIn(query.toPreRes());
        }

        /**
         * 该字段与给定值相似

         * e.g. sql中的like语句,应当用+将它们连接起来
         *
         * @param obj 给定值
         * @return 条件
         */
        public Condition like(Object... obj) {
                return new Condition(this, ConditionTypes.like, new Object[]{obj});
        }

        /**
         * 该字段是空的
         *
         * @return 条件
         */
        public Condition isNull() {
                return new Condition(this, ConditionTypes.isNull, new Object[0]);
        }

        /**
         * 该字段非空
         *
         * @return 条件
         */
        public Condition isNotNull() {
                return new Condition(this, ConditionTypes.isNotNull, new Object[0]);
        }

        /**
         * 该字段属于某个集合
         *
         * @param pc 要判断的集合
         * @return 条件
         */
        public Condition member(ParameterAggregate pc) {
                return new Condition(this, ConditionTypes.member, new Object[]{pc});
        }

        /**
         * 该字段不属于某个集合
         *
         * @param pc 要判断的集合
         * @return 条件
         */
        public Condition notMember(ParameterAggregate pc) {
                return new Condition(this, ConditionTypes.notMember, new Object[]{pc});
        }
}