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Sparrow算法篇 从日期取交加到思维模式-2

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Sparrow算法篇 从日期取交集到思维模式-2

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Sparrow算法篇 从日期取交集到思维模式

  • 这样的时间段有成百上千条该如何处理?
  • 如果我们需要根据具有日期交集的时间段分组呢?
  • 如果我们的业务不是日期,而是其他数据类型呢?如何抽象出计算模型?非日期型数据也可以进行分组?

上一篇分享日期取交集的核心逻辑。 但映射到具体业务上可能有更复杂的场景,比如第一个问题,两个日期取交集还好搞好,但日期段很多的情况下,如何按每一个时间段相同的数据进行分组呢。

 

 

即每两个红点之间的日期不能出现断点,要么没有交集,有交集就一定是连续的。 所以解决这个问题的第一步就是如何确定红点(这一点很重要,凭直觉,遵照人脑思维落点,如果根据日期探测,逻辑将变得非常困难)。

  • 第一步确定之后,我们根据所有日期段的开始和截止点进行坐标落点
  • 第二步根据坐标点,确定我们将要拆分的日期段组。
  • 第三步 日期段组的起始时间确定后,再依次根据日期取交集,即可实现多日期段下的日期交集逻辑。
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.sparrow.core.algorithm.gouping;

import java.util.*;

/**
 * E 为段类型 D为点类型
 * @author harry
 */
public class Coordinate<E extends Segment<D>, D extends Comparable> {
    public Coordinate(List<E> dataList) {
        this.dataList = dataList;
    }

    private List<E> dataList = new ArrayList<E>();

    protected List<Segment<D>> segments = new ArrayList<Segment<D>>();

    protected List<Point<D>> coordinate = new ArrayList<Point<D>>();

    public List<Point<D>> getCoordinate() {
        return coordinate;
    }

    //画从标点
    public void draw() {
        Map<Comparable, Point<D>> coordinate = new TreeMap<Comparable, Point<D>>();
        for (E segment : this.dataList) {
            Point<D> point = coordinate.get(segment.getStart().getPoint());
            if (point == null) {
                point = new Point<D>(segment.getStart().getPoint(), true, null);
                coordinate.put(segment.getStart().getPoint(), point);
            }

            point = coordinate.get(segment.getEnd().getPoint());
            if (point == null) {
                point = new Point<D>(segment.getEnd().getPoint(), null, true);
                coordinate.put(segment.getEnd().getPoint(), point);
            }
        }
        this.coordinate = new ArrayList<Point<D>>(coordinate.values());
    }

    //分组,可被重写实现
    public void section() {
        for (int i = 0; i < this.coordinate.size() - 1; i++) {
            Point<D> current = this.coordinate.get(i);
            Point<D> next = this.coordinate.get(i + 1);
            this.segments.add(new Segment<D>(current, next));
        }
    }

    //对每组数据聚合操作
    public Map<Segment<D>, List<E>> aggregation() {
        Map<Segment<D>, List<E>> segmentMap = new HashMap<Segment<D>, List<E>>();
        for (Segment<D> segment : this.segments) {
            segmentMap.put(segment, this.aggregation(segment));
        }
        return segmentMap;
    }

    private List<E> aggregation(Segment<D> s) {
        List<E> segments = new ArrayList<E>();
        for (E segment : this.dataList) {
            if (segment.getStart().getPoint().compareTo(s.getStart().getPoint()) > 0) {
                continue;
            }
            if (segment.getEnd().getPoint().compareTo(s.getStart().getPoint()) > 0) {
                segments.add(segment);
            }
        }
        return segments;
    }

    public List<Segment<D>> getSegments() {
        return segments;
    }
}

类封装之后可供上层业务端调用,为考虑其他业务场景,非日期类型数据的取交集我们将日期段类定义为泛型(类型参数化)

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.sparrow.core.algorithm.gouping;

/**
 * @author by harry
 */
public class Segment<T extends Comparable> {
    private Point<T> start;
    private Point<T> end;

    public Segment(T start, T end) {
        if (end.compareTo(start) < 0) {
            throw new IllegalArgumentException("this.end<this.start");
        }
        this.start = new Point<T>(start);
        this.end = new Point<T>(end);
    }

    public Segment(Point<T> start, Point<T> end) {
        if (end.getPoint().compareTo(start.getPoint()) < 0) {
            throw new IllegalArgumentException("end=" + end.getPoint() + "< start=" + start.getPoint());
        }
        this.start = start;
        this.end = end;
    }

    public Point<T> getStart() {
        return start;
    }

    public void setStart(Point<T> start) {
        this.start = start;
    }

    public Point<T> getEnd() {
        return end;
    }

    public void setEnd(Point<T> end) {
        this.end = end;
    }

    public boolean equals(Segment<T> segment) {
        if (this.start.getPoint().compareTo(segment.start.getPoint()) != 0) {
            return false;
        }
        return this.end.getPoint().compareTo(segment.end.getPoint()) == 0;
    }

    public Segment<T> intersection(Segment<T> segment) {
        if (segment.getEnd().getPoint().compareTo(segment.getStart().getPoint()) < 0) {
            throw new IllegalArgumentException("segment.end < segment.start");
        }
        //取大的起始节点
        Point<T> start = this.start.getPoint().compareTo(segment.start.getPoint()) > 0 ? this.start : segment.start;
        //取小的截止节点
        Point<T> end = this.end.getPoint().compareTo(segment.end.getPoint()) < 0 ? this.end : segment.end;

        if (start.getPoint().compareTo(end.getPoint()) <= 0) {
            return new Segment(start, end);
        }
        return null;
    }

    public Segment union(Segment<T> segment) {
        if (segment.getEnd().getPoint().compareTo(segment.getStart().getPoint()) < 0) {
            throw new IllegalArgumentException("segment.end < segment.start");
        }
        //取小的起始节点
        Point<T> start = this.start.getPoint().compareTo(segment.start.getPoint()) < 0 ? this.start : segment.start;
        //取大的截止节点
        Point<T> end = this.end.getPoint().compareTo(segment.end.getPoint()) > 0 ? this.end : segment.end;

        if (start.getPoint().compareTo(end.getPoint()) <= 0) {
            return new Segment<T>(start, end);
        }
        return null;
    }


    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Segment<?> segment = (Segment<?>) o;
        return start.equals(segment.start) && end.equals(segment.end);
    }

    @Override
    public int hashCode() {
        int result = start.hashCode();
        result = 31 * result + end.hashCode();
        return result;
    }

    @Override
    public String toString() {
        return "Segment{" +
                "start=" + start.getPoint() +
                ", end=" + end.getPoint() +
                '}';
    }
}

如果segment还有其他的属性,可以继承实现segment类

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.sparrow.facade.segment;

import com.sparrow.constant.DATE_TIME;
import com.sparrow.core.algorithm.gouping.Segment;
import com.sparrow.utility.DateTimeUtility;

/**
 * @author harry
 */
public class BusinessSegment extends Segment<Long> {
    public BusinessSegment(Long id, String type, Long start, Long end) {
        super(start, end);
        this.id = id;
        this.type = type;
    }

   //自定义属 性 
    private Long id;
    //自定义属 性 
    private String type;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public String toString() {
        String start=DateTimeUtility.getFormatTime((Long) this.getStart().getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD);
        String end=DateTimeUtility.getFormatTime((Long)this.getEnd().getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD);
        return "cat-record{" +
            "id=" + id +
            ", type='" + type + '\'' +
            "} " +  start+"-"+end;
    }
}

具体业务的分组逻辑可能不同,继承重写section方法即可

static class IntegerCoordinate extends Coordinate<BusinessSegment, Long> {

        public IntegerCoordinate(List<BusinessSegment> dataList) {
            super(dataList);
        }

        @Override
        public void section() {
            for (Point<Long> point : this.coordinate) {
                System.out.println(DateTimeUtility.getFormatTime(point.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS));
            }
            for (int i = 0; i < this.coordinate.size() - 1; i++) {

                Point<Long> current = this.coordinate.get(i);
                Point<Long> start = Point.copy(current);
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(start.getPoint());
                if (calendar.get(Calendar.HOUR_OF_DAY) == 23) {
                    calendar.add(Calendar.SECOND, 1);
                    start.setPoint(calendar.getTimeInMillis());
                }

                Point<Long> next = this.coordinate.get(i + 1);
                Point<Long> end = Point.copy(next);
                if (DateTimeUtility.getInterval(start.getPoint(), next.getPoint(), DATE_TIME_UNIT.SECOND) <= 5) {
                    i++;
                    continue;
                }

                calendar.setTimeInMillis(end.getPoint());
                if (calendar.get(Calendar.HOUR_OF_DAY) == 0) {
                    calendar.add(Calendar.SECOND, -1);
                    end.setPoint(calendar.getTimeInMillis());
                }
                System.out.println(DateTimeUtility.getFormatTime(start.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS) + "-" +
                        DateTimeUtility.getFormatTime(end.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS));
                this.segments.add(new Segment<Long>(start, end));
            }
        }
    }

demo示例

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.sparrow.facade.segment;

import com.sparrow.constant.DATE_TIME;
import com.sparrow.core.algorithm.gouping.Point;
import com.sparrow.core.algorithm.gouping.Segment;
import com.sparrow.core.algorithm.gouping.Coordinate;
import com.sparrow.enums.DATE_TIME_UNIT;
import com.sparrow.utility.DateTimeUtility;

import java.util.*;

/**
 * @author harry
 */
public class Main {
    static class IntegerCoordinate extends Coordinate<BusinessSegment, Long> {

        public IntegerCoordinate(List<BusinessSegment> dataList) {
            super(dataList);
        }

        @Override
        public void section() {
            for (Point<Long> point : this.coordinate) {
                System.out.println(DateTimeUtility.getFormatTime(point.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS));
            }
            for (int i = 0; i < this.coordinate.size() - 1; i++) {

                Point<Long> current = this.coordinate.get(i);
                Point<Long> start = Point.copy(current);
                Calendar calendar = Calendar.getInstance();
                calendar.setTimeInMillis(start.getPoint());
                if (calendar.get(Calendar.HOUR_OF_DAY) == 23) {
                    calendar.add(Calendar.SECOND, 1);
                    start.setPoint(calendar.getTimeInMillis());
                }

                Point<Long> next = this.coordinate.get(i + 1);
                Point<Long> end = Point.copy(next);
                if (DateTimeUtility.getInterval(start.getPoint(), next.getPoint(), DATE_TIME_UNIT.SECOND) <= 5) {
                    i++;
                    continue;
                }

                calendar.setTimeInMillis(end.getPoint());
                if (calendar.get(Calendar.HOUR_OF_DAY) == 0) {
                    calendar.add(Calendar.SECOND, -1);
                    end.setPoint(calendar.getTimeInMillis());
                }
                System.out.println(DateTimeUtility.getFormatTime(start.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS) + "-" +
                        DateTimeUtility.getFormatTime(end.getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS));
                this.segments.add(new Segment<Long>(start, end));
            }
        }
    }

    enum SEGMENT_TYPE {
        TYPE_001,
        TYPE_002,

        TYPE_003,
        TYPE_004,

        TYPE_005,
        TYPE_006,

        TYPE_007,
        TYPE_008,

        TYPE_009,
        TYPE_010
    }

    public static void main(String[] args) {
        List<BusinessSegment> list = new ArrayList<BusinessSegment>();

        //Long id, String type, Integer start, Integer end
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_001.name(), DateTimeUtility.parse("2018-02-05 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-11 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_002.name(), DateTimeUtility.parse("2018-02-06 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-10 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_004.name(), DateTimeUtility.parse("2018-02-07 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-09 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_005.name(), DateTimeUtility.parse("2018-02-08 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-08 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_006.name(), DateTimeUtility.parse("2018-02-05 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-19 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_007.name(), DateTimeUtility.parse("2018-02-20 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-22 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_008.name(), DateTimeUtility.parse("2018-02-21 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-23 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_009.name(), DateTimeUtility.parse("2018-02-22 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-24 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_010.name(), DateTimeUtility.parse("2018-02-23 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-25 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));
        list.add(new BusinessSegment(1L, SEGMENT_TYPE.TYPE_010.name(), DateTimeUtility.parse("2018-02-25 00:00:00", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS), DateTimeUtility.parse("2018-02-28 23:59:59", DATE_TIME.FORMAT_YYYY_MM_DD_HH_MM_SS)));


        Coordinate<BusinessSegment, Long> coordinate = new IntegerCoordinate(list);
        coordinate.draw();
        coordinate.section();

        Map<Segment<Long>, List<BusinessSegment>> map = coordinate.aggregation();
        for (Segment segment : coordinate.getSegments()) {
            System.out.print(DateTimeUtility.getFormatTime((Long) segment.getStart().getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD) + "-");
            System.out.println(DateTimeUtility.getFormatTime((Long) segment.getEnd().getPoint(), DATE_TIME.FORMAT_YYYY_MM_DD));
            System.out.println(map.get(segment));
        }
    }
}

示例运行结果

2018-02-05->2018-02-05
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-06->2018-02-06
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_002'} 2018-02-06-2018-02-10, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-07->2018-02-07
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_002'} 2018-02-06-2018-02-10, cat-record{id=1, type='TYPE_004'} 2018-02-07-2018-02-09, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-08->2018-02-08
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_002'} 2018-02-06-2018-02-10, cat-record{id=1, type='TYPE_004'} 2018-02-07-2018-02-09, cat-record{id=1, type='TYPE_005'} 2018-02-08-2018-02-08, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-09->2018-02-09
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_002'} 2018-02-06-2018-02-10, cat-record{id=1, type='TYPE_004'} 2018-02-07-2018-02-09, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-10->2018-02-10
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_002'} 2018-02-06-2018-02-10, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-11->2018-02-11
[cat-record{id=1, type='TYPE_001'} 2018-02-05-2018-02-11, cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-12->2018-02-19
[cat-record{id=1, type='TYPE_006'} 2018-02-05-2018-02-19]
2018-02-21->2018-02-21
[cat-record{id=1, type='TYPE_007'} 2018-02-20-2018-02-22, cat-record{id=1, type='TYPE_008'} 2018-02-21-2018-02-23]
2018-02-22->2018-02-22
[cat-record{id=1, type='TYPE_007'} 2018-02-20-2018-02-22, cat-record{id=1, type='TYPE_008'} 2018-02-21-2018-02-23, cat-record{id=1, type='TYPE_009'} 2018-02-22-2018-02-24]
2018-02-24->2018-02-24
[cat-record{id=1, type='TYPE_009'} 2018-02-22-2018-02-24, cat-record{id=1, type='TYPE_010'} 2018-02-23-2018-02-25]
2018-02-26->2018-02-28
[cat-record{id=1, type='TYPE_010'} 2018-02-25-2018-02-28]

完整示例代码下载 https://github.com/sparrowzoo/sparrow

sparrow-test项目下的

com.sparrow.facade.segmen.Main方法

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看13位CEO、创始人和高管如何提高工作效率
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什么才是优秀的用户界面设计
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科技史上最臭名昭著的13大罪犯
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程序员都该阅读的书
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每天工作4小时的程序员
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Java程序员必看电影
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初级 vs 高级开发者 哪个性价比更高?
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鲜为人知的编程真相
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程序员眼里IE浏览器是什么样的
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程序员周末都喜欢做什么?
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60个开发者不容错过的免费资源库
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10个帮程序员减压放松的网站
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5款最佳正则表达式编辑调试器
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那些性感的让人尖叫的程序员
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代码女神横空出世
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“懒”出效率是程序员的美德
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如何成为一名黑客
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做程序猿的老婆应该注意的一些事情
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程序员的鄙视链
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2013年美国开发者薪资调查报告
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总结2014中国互联网十大段子
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我是如何打败拖延症的
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为什么程序员都是夜猫子
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团队中“技术大拿”并非越多越好
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程序员应该关注的一些事儿
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不懂技术不要对懂技术的人说这很容易实现
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程序员的样子
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老程序员的下场
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程序员最害怕的5件事 你中招了吗?
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