Add static factory methods for true and false specifications

ngmy · Jul 31, 2022 · 0c91ec8 · 0c91ec8
1 parent aff1530
commit 0c91ec8
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diff --git a/src/AbstractSpecification.php b/src/AbstractSpecification.php
@@ -24,6 +24,22 @@ abstract class AbstractSpecification implements SpecificationInterface
      */
     abstract public function isSatisfiedBy($candidate): bool;
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function true(): SpecificationInterface
+    {
+        return TrueSpecification::getInstance();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public static function false(): SpecificationInterface
+    {
+        return FalseSpecification::getInstance();
+    }
+
     /**
      * {@inheritdoc}
      */

diff --git a/src/SpecificationInterface.php b/src/SpecificationInterface.php
@@ -26,6 +26,20 @@ interface SpecificationInterface
      */
     public function isSatisfiedBy($candidate): bool;
 
+    /**
+     * Create a new specification that is always true.
+     *
+     * @return SpecificationInterface<T> a new specification
+     */
+    public static function true(): SpecificationInterface;
+
+    /**
+     * Create a new specification that is always false.
+     *
+     * @return SpecificationInterface<T> a new specification
+     */
+    public static function false(): SpecificationInterface;
+
     /**
      * Create a new specification that is the AND operation of this specification and another specification.
      *