diff --git a/src/Symfony/Components/Console/Input/Input.php b/src/Symfony/Components/Console/Input/Input.php
index a203313dd103..9e9e5f48263c 100644
--- a/src/Symfony/Components/Console/Input/Input.php
+++ b/src/Symfony/Components/Console/Input/Input.php
@@ -129,6 +129,18 @@ public function setArgument($name, $value)
     $this->arguments[$name] = $value;
   }
 
+  /**
+   * Returns true if an InputArgument object exists by name or position.
+   *
+   * @param string|integer $name The InputArgument name or position
+   *
+   * @return Boolean true if the InputArgument object exists, false otherwise
+   */
+  public function hasArgument($name)
+  {
+    return $this->definition->hasArgument($name);
+  }
+
   /**
    * Returns the options values.
    *
@@ -171,4 +183,16 @@ public function setOption($name, $value)
 
     $this->options[$name] = $value;
   }
+
+  /**
+   * Returns true if an InputOption object exists by name.
+   *
+   * @param string $name The InputOption name
+   *
+   * @return Boolean true if the InputOption object exists, false otherwise
+   */
+  public function hasOption($name)
+  {
+    return $this->definition->hasOption($name);
+  }
 }