Add Entity-Attribute-Value (EAV) pattern

More/EAV/Attribute.php

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+<?php
+
+namespace DesignPatterns\More\EAV;
+
+/**
+ * Class Attribute
+ */
+class Attribute implements ValueInterface
+{
+    /**
+     * @var Value[]|ValueInterface[]|array
+     */
+    private $values = [];
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @return Value[]|ValueInterface[]|array
+     */
+    public function getValues()
+    {
+        return $this->values;
+    }
+
+    /**
+     * @param Value|ValueInterface $value
+     * @return $this
+     */
+    public function addValue(ValueInterface $value)
+    {
+        // @TODO I think the $value should be checked for uniqueness first to avoid duplication in array.
+        $this->values[] = $value;
+
+        return $this;
+    }
+
+    /**
+     * @param Value|ValueInterface $value
+     * @return $this
+     */
+    public function removeValue(ValueInterface $value)
+    {
+        if ($key = array_search($value, $this->values, true)) {
+            unset($this->values[$key]);
+        }
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $name
+     * @return $this
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+}

More/EAV/Entity.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace DesignPatterns\More\EAV;
+
+/**
+ * Class Entity
+ */
+class Entity implements ValueInterface
+{
+    /**
+     * @var Value[]|ValueInterface[]|array
+     */
+    private $values = [];
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    /**
+     * @return Value[]|ValueInterface[]|array
+     */
+    public function getValues()
+    {
+        return $this->values;
+    }
+
+    /**
+     * @param Value|ValueInterface $value
+     * @return $this
+     */
+    public function addValue(ValueInterface $value)
+    {
+        // @TODO I think the $value should be checked for uniqueness first to avoid duplication in array.
+        $this->values[] = $value;
+
+        return $this;
+    }
+
+    /**
+     * @param Value|ValueInterface $value
+     * @return $this
+     */
+    public function removeValue(ValueInterface $value)
+    {
+        if ($key = array_search($value, $this->values, true)) {
+            unset($this->values[$key]);
+        }
+
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $name
+     * @return $this
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+}

More/EAV/Value.php

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+<?php
+
+namespace DesignPatterns\More\EAV;
+
+/**
+ * Class Value
+ */
+class Value
+{
+    /**
+     * @var Attribute
+     */
+    private $attribute;
+
+    /**
+     * @var string
+     */
+    private $name;
+
+    public function __construct(Attribute $attribute)
+    {
+        $attribute->addValue($this);
+        $this->attribute = $attribute;
+    }
+
+    /**
+     * @return Attribute
+     */
+    public function getAttribute()
+    {
+        return $this->attribute;
+    }
+
+    /**
+     * @return string
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    /**
+     * @param string $name
+     * @return $this
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+
+        return $this;
+    }
+}

More/EAV/ValueInterface.php

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+<?php
+
+namespace DesignPatterns\More\EAV;
+
+/**
+ * Interface ValueInterface
+ */
+interface ValueInterface
+{
+    /**
+     * @return Value[]|ValueInterface[]|array
+     */
+    public function getValues();
+
+    /**
+     * @param Value|ValueInterface $value
+     */
+    public function addValue(ValueInterface $value);
+
+    /**
+     * @param Value|ValueInterface $value
+     */
+    public function removeValue(ValueInterface $value);
+}

More/EAV/example.php

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+<?php
+
+use DesignPatterns\More\EAV\Entity;
+use DesignPatterns\More\EAV\Attribute;
+use DesignPatterns\More\EAV\Value;
+
+// color attribute
+$color = (new Attribute())->setName('Color');
+// color values
+$colorSilver    = (new Value($color))->setName('Silver');
+$colorGold      = (new Value($color))->setName('Gold');
+$colorSpaceGrey = (new Value($color))->setName('Space Grey');
+
+// memory attribute
+$memory  = (new Attribute())->setName('Memory');
+// memory values
+$memory4Gb  = (new Value($memory))->setName('4GB');
+$memory8Gb  = (new Value($memory))->setName('8GB');
+$memory16Gb = (new Value($memory))->setName('16GB');
+
+// storage attribute
+$storage  = (new Attribute())->setName('Storage');
+// storage values
+$storage128Gb   = (new Value($storage))->setName('128GB');
+$storage256Gb   = (new Value($storage))->setName('256GB');
+$storage512Gb   = (new Value($storage))->setName('512GB');
+$storage1Tb     = (new Value($storage))->setName('1TB');
+
+// entities
+$mac = (new Entity())
+    ->setName('MacBook')
+    // colors
+    ->addValue($colorSilver)
+    ->addValue($colorGold)
+    ->addValue($colorSpaceGrey)
+    // memories
+    ->addValue($memory8Gb)
+    // storages
+    ->addValue($storage256Gb)
+    ->addValue($storage512Gb)
+;
+
+$macAir = (new Entity())
+    ->setName('MacBook Air')
+    // colors
+    ->addValue($colorSilver)
+    // memories
+    ->addValue($memory4Gb)
+    ->addValue($memory8Gb)
+    // storages
+    ->addValue($storage128Gb)
+    ->addValue($storage256Gb)
+    ->addValue($storage512Gb)
+;
+
+$macPro = (new Entity())
+    ->setName('MacBook Pro')
+    // colors
+    ->addValue($colorSilver)
+    // memories
+    ->addValue($memory8Gb)
+    ->addValue($memory16Gb)
+    // storages
+    ->addValue($storage128Gb)
+    ->addValue($storage256Gb)
+    ->addValue($storage512Gb)
+    ->addValue($storage1Tb)
+;