最无用的工具类封装——Equals条件封装 2

最无用的工具类封装——Equals条件封装 2

昨天出了一篇最无用的工具类封装 EqualsUtils
出这个工具类的目的是为了解决书写 if 语句比较多的时候造成的错误，结果搞出个什么鬼
今天我针对昨天的 EqualsUtils 做了扩展，并使用了一个新名字——IfUtils

社会我 T 哥，人狠话不多，上代码

package cn.texous.test.demo.commons.utils;

import lombok.Data;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Supplier;

import static cn.texous.test.demo.commons.utils.IfUtils.Condition.equalsCondition;
import static cn.texous.test.demo.commons.utils.IfUtils.Condition.newCondition;
import static cn.texous.test.demo.commons.utils.IfUtils.Condition.notEqualsCondition;

/**
 * if 条件构造工具类
 *
 * @author Showa.L
 * @since 2020/7/16 9:58
 */
public class IfUtils {

    /**
     * 判断连个对象是否 equals
     *
     * @param source 原对象
     * @param target 目标对象
     * @return
     */
    public static boolean equals(Object source, Object target) {
        if (source == target)
            return true;
        return Optional.ofNullable(source).map(s -> s.equals(target)).orElse(false);
    }

    /**
     * 判断连个对象是否 equals
     *
     * @param sourceSupplier 原对象提供者
     * @param targetSupplier 目标对象提供者
     * @return
     */
    public static boolean equals(Supplier<Object> sourceSupplier, Supplier<Object> targetSupplier) {
        return equals(sourceSupplier.get(), targetSupplier.get());
    }

    /**
     * 判断连个对象是否 notEquals
     *
     * @param source 原对象
     * @param target 目标对象
     * @return
     */
    public static boolean notEquals(Object source, Object target) {
        return !equals(source, target);
    }

    /**
     * 判断连个对象是否 notEquals
     *
     * @param sourceSupplier 原对象提供者
     * @param targetSupplier 目标对象提供者
     * @return
     */
    public static boolean notEquals(Supplier<Object> sourceSupplier, Supplier<Object> targetSupplier) {
        return notEquals(sourceSupplier.get(), targetSupplier.get());
    }

    /**
     * 判断对象是否为 true
     *
     * @param source 类型
     * @return
     */
    public static boolean isTrue(Boolean source) {
        return Optional.ofNullable(source).orElse(false);
    }

    /**
     * 判断对象是否为 false
     *
     * @param source 类型
     * @return
     */
    public static boolean isFalse(Boolean source) {
        return !isTrue(source);
    }

    /**
     * 构建对象关系
     *
     * @param condition 对象条件 {@link Condition}
     * @return
     */
    public static Relation build(Supplier<Boolean> condition) {
        return Relation.build(condition);
    }

    /**
     * 校验判断
     *
     * @param relation 条件语句
     * @return
     */
    public static Boolean validate(Relation relation) {
        return relation.validate();
    }

    /**
     * 校验成功后处理
     *
     * @param relation    校验条件
     * @param doSomething 处理方法
     */
    public static void validateThen(Relation relation, Consumer<Boolean> doSomething) {
        Optional.ofNullable(relation).map(Relation::validate).filter(IfUtils::isTrue).ifPresent(doSomething);
    }

    /**
     * 需要进行对比的对象，及对比条件
     *
     * @param <S> 对象1
     * @param <T> 对象2
     */
    @Data
    public static class Condition<S, T> implements Supplier<Boolean> {
        private S source;
        private T target;
        private List<CompareInfo<S, T>> compares = new ArrayList<>();

        private Condition(S source, T target, BiFunction<S, T, Boolean> compare) {
            this.source = source;
            this.target = target;
            this.compares.add(CompareInfo.build(compare));
        }

        @Override
        public Boolean get() {
            Boolean result = null;
            for (CompareInfo<S, T> compare : compares) {
                if (result != null) {
                    if (compare.isOr()) {
                        result = result || compare.getCompare().apply(source, target);
                    } else {
                        result = result && compare.getCompare().apply(source, target);
                    }
                } else {
                    result = compare.getCompare().apply(source, target);
                }
            }
            return result;
        }

        public Condition<S, T> and(BiFunction<S, T, Boolean> compare) {
            compares.add(CompareInfo.buildAnd(compare));
            return this;
        }

        public Condition<S, T> or(BiFunction<S, T, Boolean> compare) {
            compares.add(CompareInfo.buildOr(compare));
            return this;
        }

        public static <S, T> Condition<S, T> equalsCondition(S source, T target) {
            return new Condition<>(source, target, IfUtils::equals);
        }

        public static <S, T> Condition<S, T> equalsCondition(Supplier<S> sourceSupp, Supplier<T> targetSupp) {
            return new Condition<>(sourceSupp.get(), targetSupp.get(), IfUtils::equals);
        }

        public static <S, T> Condition<S, T> notEqualsCondition(S source, T target) {
            return new Condition<>(source, target, IfUtils::notEquals);
        }

        public static <S, T> Condition<S, T> notEqualsCondition(Supplier<S> sourceSupp, Supplier<T> targetSupp) {
            return new Condition<>(sourceSupp.get(), targetSupp.get(), IfUtils::notEquals);
        }

        public static <S, T> Condition<S, T> newCondition(S source, T target, BiFunction<S, T, Boolean> compare) {
            return new Condition<>(source, target, compare);
        }

    }

    /**
     * 兼容一组对象多个属性分别对比的情况
     *
     * @param <S> 对象1
     * @param <T> 对象2
     */
    @Data
    public static class CompareInfo<S, T> {
        private boolean isOr;
        private BiFunction<S, T, Boolean> compare;

        private CompareInfo() {
        }

        private CompareInfo(BiFunction<S, T, Boolean> compare) {
            this.compare = compare;
        }

        private CompareInfo(BiFunction<S, T, Boolean> compare, boolean isOr) {
            this.compare = compare;
            this.isOr = isOr;
        }

        public static <S, T> CompareInfo<S, T> build(BiFunction<S, T, Boolean> compare) {
            return new CompareInfo<>(compare);
        }

        public static <S, T> CompareInfo<S, T> buildAnd(BiFunction<S, T, Boolean> compare) {
            return new CompareInfo<>(compare, Boolean.FALSE);
        }

        public static <S, T> CompareInfo<S, T> buildOr(BiFunction<S, T, Boolean> compare) {
            return new CompareInfo<>(compare, Boolean.TRUE);
        }

    }

    /**
     * 节点之间的关系表示
     */
    @Data
    public static class Relation {
        private Supplier<Boolean> source;
        // 节点和上一个节点之间的关系
        private boolean isOr;
        private List<Relation> relations = new ArrayList<>();

        public Relation(Supplier<Boolean> condition) {
            this.source = condition;
        }

        public Relation(Supplier<Boolean> condition, boolean isOr) {
            this.source = condition;
            this.isOr = isOr;
        }

        public Relation andGroup(Relation relation) {
            relation.setOr(Boolean.FALSE);
            relations.add(relation);
            return this;
        }

        public Relation orGroup(Relation relation) {
            relation.setOr(Boolean.TRUE);
            relations.add(relation);
            return this;
        }

        public Relation and(Supplier<Boolean> condition) {
            Relation relation = new Relation(condition, Boolean.FALSE);
            relations.add(relation);
            return this;
        }

        public Relation or(Supplier<Boolean> condition) {
            Relation relation = new Relation(condition, Boolean.TRUE);
            relations.add(relation);
            return this;
        }

        public boolean isAnd() {
            return !isOr;
        }

        public boolean validate() {
            boolean validate = source.get();
            for (Relation relation : relations) {
                if (relation.isAnd())
                    validate = validate && relation.validate();
                else {
                    validate = validate || relation.validate();
                }
            }
            return validate;
        }

        public String toString() {
            StringBuilder sb = new StringBuilder()
                    .append("(")
                    .append(source.get());
            relations.forEach(c -> sb.append(c.isOr() ? " || " : " && ").append(c.toString()));
            sb.append(")");
            return sb.toString();
        }

        public static Relation buildAnd(Supplier<Boolean> condition) {
            return new Relation(condition, Boolean.FALSE);
        }

        public static Relation buildOr(Supplier<Boolean> condition) {
            return new Relation(condition, Boolean.TRUE);
        }

        public static Relation build(Supplier<Boolean> condition) {
            return new Relation(condition);
        }

    }

    public static void main(String[] args) {
        boolean a = true;
        boolean b = false;
        boolean c = true;
        boolean d = false;
        Relation or = IfUtils.build(() -> a).and(() -> b).andGroup(IfUtils.build(() -> c).and(() -> d).orGroup(IfUtils.build(() -> a).or(() -> b))).and(() -> b).or(() -> c);
        System.out.println(or.toString());
        System.out.println(or.validate());

        Relation and = IfUtils.build(equalsCondition(a, b)).and(notEqualsCondition(c, d));
        System.out.println(and.toString());
        System.out.println(and.validate());

        String e = "e";
        String f = "f";
        String g = "g";
        System.out.println("(e == e || e == f) && (e==f || (e == e && f == f))");
        Relation relation = IfUtils.build(equalsCondition(e, e)).or(equalsCondition(e, f))
                .andGroup(IfUtils.build(equalsCondition(e, f))
                        .or(equalsCondition(e, e))
                        .and(equalsCondition(f, f)));
        validateThen(relation, System.out::println);

        System.out.println("(e == e || e == f) && (e == f || (e == e && f == g))");
        relation = IfUtils.build(equalsCondition(e, e))
                .or(equalsCondition(e, f))
                .andGroup(IfUtils.build(equalsCondition(e, f))
                        .orGroup(IfUtils.build(equalsCondition(e, e))
                                .and(equalsCondition(f, g))));
        validateThen(relation, System.out::println);
        System.out.println(relation.validate());

        User user = new User();
        user.setAge(12);
        user.setName("user 1");
        user.setNick("张三");

        User user1 = new User();
        user1.setAge(12);
        user1.setName("user 1");
        user1.setNick("里斯");

//        relation = build(equalsCondition(user::getName, user1::getName))
//                .and(equalsCondition(user::getAge, user1::getAge))
//                .and(equalsCondition(user::getAge, user1::getAge));

        relation = IfUtils.build(newCondition(user, user1, (u, u1) -> equals(u::getName, u1::getName))
                .and((u, u1) -> equals(u::getAge, u1::getAge)))
                .and(equalsCondition(user::getAge, user1::getAge));
        System.out.println(relation.toString());
        System.out.println(relation.validate());

        relation = IfUtils.build(equalsCondition(user::getName, user1::getName))
                .and(equalsCondition(user::getAge, user1::getAge));
        System.out.println(relation.toString());
        System.out.println(relation.validate());

        // relation = build(equalsCondition(user::getNick, user1::getNick));
        relation = IfUtils.build(newCondition(user, user1, (u, u1) -> equals(u::getNick, u1::getNick)));
        System.out.println(relation.toString());
        System.out.println(relation.validate());

        System.out.println("简洁性对比1-------------------------");
        if (equals(user::getName, user1::getName)
                && equals(user::getAge, user1::getAge)
                && equals(user::getAge, user::getAge)) {
            System.out.println(true);
        }

        validateThen(build(equalsCondition(user::getName, user1::getName))
                        .and(equalsCondition(user::getAge, user1::getAge))
                        .and(equalsCondition(user::getAge, user1::getAge)),
                System.out::println);

        System.out.println("可观看性对比-----------------------");
        if (equals(user::getName, user1::getName)
                && (notEquals(user::getNick, user1::getNick)
                || notEquals(user::getAge, user1::getAge)))
            System.out.println(true);

        validateThen(build(equalsCondition(user::getName, user1::getName))
                        .andGroup(build(notEqualsCondition(user::getNick, user1::getNick))
                                .or(equalsCondition(user::getAge, user1::getAge))),
                System.out::println);

        // 要他有何用
    }

    @Data
    private static final class User {
        private String name;
        private Integer age;
        private String nick;
    }

}

经过一系列的测试对比后发现，真的是一点用都没有

加粗的一群乌鸦飞过。

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我要这代码有何用。

本文地址：https://blog.csdn.net/qq_28038487/article/details/107390305