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Memento pattern.

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- Caretaker should save history for normal pattern implementation.
- Importent notes in code of Originator.
- Readme with full pattern philosophy.
- Tests and example of usage inside test.
This commit is contained in:
Евгений Глотов
2015-05-30 03:58:34 +03:00
parent 4703828950
commit 0ebafc5eaa
5 changed files with 160 additions and 48 deletions
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131
Behavioral/Memento/Tests/MementoTest.php
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@@ -2,6 +2,8 @@
namespace DesignPatterns\Behavioral\Memento\Tests;
use DesignPatterns\Behavioral\Memento\Caretaker;
use DesignPatterns\Behavioral\Memento\Memento;
use DesignPatterns\Behavioral\Memento\Originator;
/**
@@ -10,6 +12,37 @@ use DesignPatterns\Behavioral\Memento\Originator;
class MementoTest extends \PHPUnit_Framework_TestCase
{
public function testUsageExample()
{
$originator = new Originator();
$caretaker = new Caretaker();
$character = new \stdClass();
$character->name = "Gandalf"; // new object
$originator->setState($character); // connect Originator to character object
$character->name = "Gandalf the Grey"; // work on the object
$character->race = "Maia"; // still change something
$snapshot = $originator->getStateAsMemento(); // time to save state
$caretaker->saveToHistory($snapshot); // put state to log
$character->name = "Sauron"; // change something
$character->race = "Ainur"; // and again
$this->assertAttributeEquals($character, "state", $originator); // state inside the Originator was equally changed
$snapshot = $originator->getStateAsMemento(); // time to save another state
$caretaker->saveToHistory($snapshot); // put state to log
$rollback = $caretaker->getFromHistory(0);
$originator->restoreFromMemento($rollback); // return to first state
$character = $rollback->getState(); // use character from old state
$this->assertEquals("Gandalf the Grey", $character->name); // yes, that what we need
$character->name = "Gandalf the White"; // make new changes
$this->assertAttributeEquals($character, "state", $originator); // and Originator linked to actual object again
}
public function testStringState()
{
$originator = new Originator();
@@ -18,52 +51,94 @@ class MementoTest extends \PHPUnit_Framework_TestCase
$this->assertAttributeEquals("State1", "state", $originator);
$originator->setState("State2");
$this->assertAttributeEquals("State2", "state", $originator);
$savedState = $originator->saveToMemento();
$this->assertAttributeEquals("State2", "state", $savedState);
$snapshot = $originator->getStateAsMemento();
$this->assertAttributeEquals("State2", "state", $snapshot);
$originator->setState("State3");
$this->assertAttributeEquals("State3", "state", $originator);
$originator->restoreFromMemento($savedState);
$originator->restoreFromMemento($snapshot);
$this->assertAttributeEquals("State2", "state", $originator);
}
public function testObjectState()
public function testSnapshotIsClone()
{
$originator = new Originator();
$object = new \stdClass();
$originator->setState($object);
$snapshot = $originator->getStateAsMemento();
$object->new_property = 1;
$this->assertAttributeEquals($object, "state", $originator);
$this->assertAttributeNotEquals($object, "state", $snapshot);
$originator->restoreFromMemento($snapshot);
$this->assertAttributeNotEquals($object, "state", $originator);
}
public function testCanChangeActualState()
{
$originator = new Originator();
$first_state = new \stdClass();
$originator->setState($first_state);
$snapshot = $originator->getStateAsMemento();
$second_state = $snapshot->getState();
$first_state->first_property = 1; // still actual
$second_state->second_property = 2; // just history
$this->assertAttributeEquals($first_state, "state", $originator);
$this->assertAttributeNotEquals($second_state, "state", $originator);
$originator->restoreFromMemento($snapshot);
$first_state->first_property = 11; // now it lost state
$second_state->second_property = 22; // must be actual
$this->assertAttributeEquals($second_state, "state", $originator);
$this->assertAttributeNotEquals($first_state, "state", $originator);
}
public function testStateWithDifferentObjects()
{
$originator = new Originator();
$foo = new \stdClass();
$foo->data = "foo";
$first = new \stdClass();
$first->data = "foo";
$originator->setState($foo);
$originator->setState($first);
$this->assertAttributeEquals($first, "state", $originator);
$this->assertAttributeEquals($foo, "state", $originator);
$first_snapshot = $originator->getStateAsMemento();
$this->assertAttributeEquals($first, "state", $first_snapshot);
$savedState = $originator->saveToMemento();
$second = new \stdClass();
$second->data = "bar";
$originator->setState($second);
$this->assertAttributeEquals($second, "state", $originator);
$this->assertAttributeEquals($foo, "state", $savedState);
$originator->restoreFromMemento($first_snapshot);
$this->assertAttributeEquals($first, "state", $originator);
}
$bar = new \stdClass();
$bar->data = "bar";
public function testCaretaker()
{
$caretaker = new Caretaker();
$memento1 = new Memento("foo");
$memento2 = new Memento("bar");
$caretaker->saveToHistory($memento1);
$caretaker->saveToHistory($memento2);
$this->assertAttributeEquals(array($memento1, $memento2), "history", $caretaker);
$this->assertEquals($memento1, $caretaker->getFromHistory(0));
$this->assertEquals($memento2, $caretaker->getFromHistory(1));
$originator->setState($bar);
}
$this->assertAttributeEquals($bar, "state", $originator);
$originator->restoreFromMemento($savedState);
$this->assertAttributeEquals($foo, "state", $originator);
$foo->data = null;
$this->assertAttributeNotEquals($foo, "state", $savedState);
$this->assertAttributeNotEquals($foo, "state", $originator);
public function testCaretakerCustomLogic()
{
$caretaker = new Caretaker();
$result = $caretaker->runCustomLogic();
$this->assertEquals("State3", $result);
}
}