Added Visitor pattern

Author: kuba

behavioral/visitor/SickLeave.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace behavioral\visitor;
+
+class SickLeave
+{
+    private $start;
+    private $end;
+
+    public function __construct(\DateTime $start, \DateTime $end)
+    {
+        $this->start = $start;
+        $this->end = $end;
+    }
+
+    public function getStart(): \DateTime
+    {
+        return $this->start;
+    }
+
+    public function getEnd(): \DateTime
+    {
+        return $this->end;
+    }
+}

behavioral/visitor/SickLeaveReport.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace behavioral\visitor;
+
+class SickLeaveReport implements Visitor
+{
+    public function visitUniversity(University $university): array
+    {
+        $msgs = [];
+        $msgs[] = "Generating sick leave report for: \"{$university->getName()}\"";
+
+        foreach ($university->getStudents() as $student) {
+            $msgs[] = $this->visitStudent($student);
+        }
+
+        return $msgs;
+    }
+
+    public function visitStudent(Student $student): string
+    {
+        $daysMissed = 0;
+
+        foreach ($student->getSickLeaves() as $sickLeave) {
+            $daysMissed = $sickLeave->getStart()->diff($sickLeave->getEnd())->days;
+        }
+
+        return "Student: {$student->getName()} missed {$daysMissed} days";
+    }
+}

behavioral/visitor/Student.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace behavioral\visitor;
+
+class Student implements Visitable
+{
+    private $name;
+    private $sickLeaves = [];
+
+    public function __construct(string $name)
+    {
+        $this->name = $name;
+    }
+
+    public function addSickLeave(\DateTime $start, \DateTime $end) : void
+    {
+        $this->sickLeaves[] = new SickLeave($start, $end);
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function getSickLeaves(): array
+    {
+        return $this->sickLeaves;
+    }
+
+    public function accept(Visitor $visitor): string
+    {
+        return $visitor->visitStudent($this);
+    }
+}

behavioral/visitor/University.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace behavioral\visitor;
+
+class University implements Visitable
+{
+    private $name;
+    private $students;
+
+    public function __construct(string $name, array $students)
+    {
+        $this->name = $name;
+        $this->students = $students;
+    }
+
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    public function getStudents(): array
+    {
+        return $this->students;
+    }
+
+    public function accept(Visitor $visitor): array
+    {
+        return $visitor->visitUniversity($this);
+    }
+}

behavioral/visitor/Visitable.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace behavioral\visitor;
+
+interface Visitable
+{
+    public function accept(Visitor $visitor);
+}

behavioral/visitor/Visitor.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace behavioral\visitor;
+
+interface Visitor
+{
+    public function visitUniversity(University $university): array;
+
+    public function visitStudent(Student $student): string;
+}
+

behavioral/visitor/demo.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace behavioral\visitor;
+
+require(__DIR__.'/../../autoloader.php');
+
+$john = new Student("John");
+$john->addSickLeave(new \DateTime("2019-10-01"), new \DateTime("2019-10-21"));
+$john->addSickLeave(new \DateTime("2019-11-02"), new \DateTime("2019-11-10"));
+
+$jan = new Student("Jan");
+$jan->addSickLeave(new \DateTime("2019-11-01"), new \DateTime("2019-11-15"));
+
+$ann = new Student("Ann");
+
+$university = new University("Visitor University", [$john, $jan, $ann]);
+$sickLeaveReport = new SickLeaveReport();
+$results = $sickLeaveReport->visitUniversity($university);
+
+function show($data)
+{
+    foreach ($data as $datum) {
+        echo $datum.PHP_EOL;
+    }
+}
+
+show($results);

structural/facade/Image.php

@@ -7,19 +7,21 @@
 
 class Image {
 
-    const FILE_THUMBNAIL_WITH = 100;
-    const FILE_THUMBNAIL_HEIGHT = 100;
+    private $imagick;
 
-    public function thumbnail ($filePath) {
-        $imagick = new Imagick($filePath);
+    public function __construct () {
+        $this->imagick = new Imagick();
+    }
 
-        $imagick->setbackgroundcolor('rgb(0, 0, 0)');
-        $imagick->thumbnailImage(self::FILE_THUMBNAIL_WITH, self::FILE_THUMBNAIL_HEIGHT, true, true);
+    public  function thumbnail (string $filePath, int $width, int $height) {
+        $this->imagick->readImage($filePath);
+        $this->imagick->setbackgroundcolor('rgb(0, 0, 0)');
+        $this->imagick->thumbnailImage($width, $height, true, true);
 
         $fileInfo = new SplFileInfo($filePath);
         $thumbPath = $fileInfo->getBasename('.' . $fileInfo->getExtension()) . '_thumb' . "." . $fileInfo->getExtension();
 
-        if (file_put_contents($thumbPath, $imagick)) {
+        if (file_put_contents($thumbPath, $this->imagick)) {
             return true;
         } else {
             throw new \Exception("Could not create thumbnail.");

structural/facade/demo.php

@@ -5,4 +5,4 @@
 require(__DIR__ . '/../../autoloader.php');
 
 $image = new Image();
-$image->thumbnail("demo.jpg");
+$image->thumbnail("demo.jpg", 100, 100);