過濾器模式（Filter Pattern）

過濾器模式 過濾器模式（Filter Pattern）或標准模式（Criteria Pattern）是一種設計模式，這種模式允許開發人員使用不同的標准來過濾一組對象，通過邏輯運算以解耦的方式把它們連接起來。這種類型的設計模式屬於結構型模式，它結合多個標准來獲得單一標准。 實現 我們將創建一個 Person 對象、Criteria 接口和實現了該接口的實體類，來過濾 Person 對象的列表。CriteriaPatternDemo，我..

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過濾器模式（Filter Pattern）或標准模式（Criteria Pattern）是一種設計模式，這種模式允許開發人員使用不同的標准來過濾一組對象，通過邏輯運算以解耦的方式把它們連接起來。這種類型的設計模式屬於結構型模式，它結合多個標准來獲得單一標准。

 

/**
 * github地址:https://github.com/ZQCard/design_pattern
 * 過濾器模式（Filter Pattern）或標准模式（Criteria Pattern）是一種設計模式
 * 這種模式允許開發人員使用不同的標准來過濾一組對象，通過邏輯運算以解耦的方式把它們連接起來。 
 * 這種類型的設計模式屬於結構型模式，它結合多個標准來獲得單一標准。
 * 例子:篩選男人、女人、單身男人、單身女人
*/

(1)Person.class.php（對象類）

<?php

namespace Filter;

class Person
{
    private $name;
    private $gender;
    private $maritalStatus;

    public function __construct($name, $gender, $maritalStatus)
    {
        $this->name = $name;
        $this->gender = $gender;
        $this->maritalStatus = $maritalStatus;
    }

    public function __get($attributes)
    {
        return $this->$attributes;
    }
}

（2）Criteria.class.php（抽象接口,規范實現類）

<?php

namespace Filter;

interface Criteria
{
    public function meetCriteria($persons);
}

（3）Male.class.php（男性類篩選）

<?php

namespace Filter;

class CriteriaMale implements Criteria
{
    public function meetCriteria($persons)
    {
        $malePerson = [];
        foreach ($persons as $person) {
            if (strtoupper($person->gender) == 'MALE') {
                $malePerson[] = $person;
            }
        }
        return $malePerson;
    }
}

（4）Female.class.php（女性類篩選）

<?php

namespace Filter;

class CriteriaFemale implements Criteria
{
    public function meetCriteria($persons)
    {
        $femalePerson = [];
        foreach ($persons as $person) {
            if (strtoupper($person->gender) == 'FEMALE') {
                $femalePerson[] = $person;
            }
        }
        return $femalePerson;
    }
}

（5）Single.class.php（單身類篩選）

<?php

namespace Filter;

class CriteriaSingle implements Criteria
{
    public function meetCriteria($persons)
    {
        $singlePerson = [];
        foreach ($persons as $person) {
            if (strtoupper($person->maritalStatus) == 'SINGLE') {
                $singlePerson[] = $person;
            }
        }
        return $singlePerson;
    }
}

（6）OrCriteria.class.php（或者條件篩選）

<?php

namespace Filter;

class OrCriteria implements Criteria
{
    private $criteria;
    private $otherCriteria;

    public function __construct(Criteria $criteria, Criteria $otherCriteria)
    {
        $this->criteria = $criteria;
        $this->otherCriteria = $otherCriteria;
    }

    public function meetCriteria($persons)
    {
        $firstCriteriaItems = $this->criteria->meetCriteria($persons);
        $otherCriteriaItems = $this->otherCriteria->meetCriteria($persons);

        foreach ($otherCriteriaItems as $person) {
            if (!in_array($person, $firstCriteriaItems)) {
                $firstCriteriaItems[] = $person;
            }
        }

        return $firstCriteriaItems;
    }
}

（6）AndCriteria.class.php（並且條件篩選）

<?php

namespace Filter;

class AndCriteria implements Criteria
{
    private $criteria;
    private $otherCriteria;

    public function __construct(Criteria $criteria,Criteria $otherCriteria)
    {
        $this->criteria = $criteria;
        $this->otherCriteria = $otherCriteria;
    }

    public function meetCriteria($persons)
    {
        $firstCriteriaPerson = $this->criteria->meetCriteria($persons);
        return $this->otherCriteria->meetCriteria($firstCriteriaPerson);
    }
}

(7)filter.php(客戶端)

<?php
spl_autoload_register(function ($className){
    $className = str_replace('\\','/',$className);
    include $className.".class.php";
});

use Filter\Person;
use Filter\CriteriaMale;
use Filter\CriteriaFemale;
use Filter\CriteriaSingle;
use Filter\AndCriteria;
use Filter\OrCriteria;

$persons = [];
$persons[] = (new Person("Robert","Male", "Single"));
$persons[] = (new Person("John","Male", "Married"));
$persons[] = (new Person("Laura","Female", "Married"));
$persons[] = (new Person("Diana","Female", "Single"));
$persons[] = (new Person("Mike","Male", "Single"));
$persons[] = (new Person("Bobby","Male", "Single"));

$male = new CriteriaMale();
$female = new CriteriaFemale();
$single = new CriteriaSingle();
$singleMale = new AndCriteria($single, $male);
$singleOrFemale = new OrCriteria($single, $female);

//Males:
//Robert John Mike Bobby
echo "Males:";
$maleList = $male->meetCriteria($persons);
foreach ($maleList as $male){
    echo $male->name.'  ';
}
echo '<br/>';

//Females:
//Laura Diana
echo "Females:";
$maleList = $female->meetCriteria($persons);
foreach ($maleList as $male){
    echo $male->name.'  ';
}
echo '<br/>';


//Single Males:
//Robert Mike Bobby
echo "Single Males:";
$singleMaleList = $singleMale->meetCriteria($persons);
foreach ($singleMaleList as $male){
    echo $male->name.'  ';
}
echo '<br/>';


//Single Or Females:
//Robert Diana Mike Bobby Laura
echo "Single Or Females:";
$singleOrFemaleList = $singleOrFemale->meetCriteria($persons);
foreach ($singleOrFemaleList as $person){
    echo $person->name.'  ';
}