<?php namespace DesignPatterns\Behavioral\Specification; /** * 判断给定Item的价格是否介于最小值和最大值之间的规格 */ class PriceSpecification extends AbstractSpecification { protected $maxPrice; protected $minPrice; /** * 设置最大值 * * @param int $maxPrice */ public function setMaxPrice($maxPrice) { $this->maxPrice = $maxPrice; } /** * 设置最小值 * * @param int $minPrice */ public function setMinPrice($minPrice) { $this->minPrice = $minPrice; } /** * 判断给定Item的定价是否在最小值和最大值之间 * * @param Item $item * * @return bool */ public function isSatisfiedBy(Item $item) { if (!empty($this->maxPrice) && $item->getPrice() > $this->maxPrice) { return false; } if (!empty($this->minPrice) && $item->getPrice() < $this->minPrice) { return false; } return true; } }
4、测试代码
Tests/SpecificationTest.php
<?php namespace DesignPatterns\Behavioral\Specification\Tests; use DesignPatterns\Behavioral\Specification\PriceSpecification; use DesignPatterns\Behavioral\Specification\Item; /** * SpecificationTest 用于测试规格模式 */ class SpecificationTest extends \PHPUnit_Framework_TestCase { public function testSimpleSpecification() { $item = new Item(100); $spec = new PriceSpecification(); $this->assertTrue($spec->isSatisfiedBy($item)); $spec->setMaxPrice(50); $this->assertFalse($spec->isSatisfiedBy($item)); $spec->setMaxPrice(150); $this->assertTrue($spec->isSatisfiedBy($item)); $spec->setMinPrice(101); $this->assertFalse($spec->isSatisfiedBy($item)); $spec->setMinPrice(100); $this->assertTrue($spec->isSatisfiedBy($item)); } public function testNotSpecification() { $item = new Item(100); $spec = new PriceSpecification(); $not = $spec->not(); $this->assertFalse($not->isSatisfiedBy($item)); $spec->setMaxPrice(50); $this->assertTrue($not->isSatisfiedBy($item)); $spec->setMaxPrice(150); $this->assertFalse($not->isSatisfiedBy($item)); $spec->setMinPrice(101); $this->assertTrue($not->isSatisfiedBy($item)); $spec->setMinPrice(100); $this->assertFalse($not->isSatisfiedBy($item)); } public function testPlusSpecification() { $spec1 = new PriceSpecification(); $spec2 = new PriceSpecification(); $plus = $spec1->plus($spec2); $item = new Item(100); $this->assertTrue($plus->isSatisfiedBy($item)); $spec1->setMaxPrice(150); $spec2->setMinPrice(50); $this->assertTrue($plus->isSatisfiedBy($item)); $spec1->setMaxPrice(150); $spec2->setMinPrice(101); $this->assertFalse($plus->isSatisfiedBy($item)); $spec1->setMaxPrice(99); $spec2->setMinPrice(50); $this->assertFalse($plus->isSatisfiedBy($item)); } public function testEitherSpecification() { $spec1 = new PriceSpecification(); $spec2 = new PriceSpecification(); $either = $spec1->either($spec2); $item = new Item(100); $this->assertTrue($either->isSatisfiedBy($item)); $spec1->setMaxPrice(150); $spec2->setMaxPrice(150); $this->assertTrue($either->isSatisfiedBy($item)); $spec1->setMaxPrice(150); $spec2->setMaxPrice(0); $this->assertTrue($either->isSatisfiedBy($item)); $spec1->setMaxPrice(0); $spec2->setMaxPrice(150); $this->assertTrue($either->isSatisfiedBy($item)); $spec1->setMaxPrice(99); $spec2->setMaxPrice(99); $this->assertFalse($either->isSatisfiedBy($item)); } }