3 files changed, 21 insertions, 0 deletions
diff --git a/classes/BiblioIsisDb.php b/classes/BiblioIsisDb.php
index 616cc77..d7fdd1c 100644
--- a/classes/BiblioIsisDb.php
+++ b/classes/BiblioIsisDb.php
@@ -118,6 +118,13 @@ class BiblioIsisDb implements IsisDb {
    * @see IsisDb::check()
    */  
   public function check($schema, $section = NULL) {
+    // Check API availability.
+    if (!class_exists('Perl')) {
+      throw new Exception('Could not find Perl class. Please check your php-perl installation.');
+      return FALSE;
+    }
+
+    // Check schema configuration.
     return SchemaDb::check($schema, $section);
   }
 
diff --git a/classes/MaleteDb.php b/classes/MaleteDb.php
index 7fa0afa..201ddc0 100644
--- a/classes/MaleteDb.php
+++ b/classes/MaleteDb.php
@@ -98,6 +98,13 @@ class MaleteDb implements IsisDb {
    * @see IsisDb::check()
    */  
   public function check($schema, $section = NULL) {
+    // Check API availability.
+    if (!class_exists('Isis_Db')) {
+      throw new Exception('Could not find Isis_Db class. Please check your malete installation.');
+      return FALSE;
+    }
+
+    // Check schema configuration.
     return SchemaDb::check($schema, $section);
   }
 
diff --git a/classes/PhpIsisDb.php b/classes/PhpIsisDb.php
index 136b657..1f64075 100644
--- a/classes/PhpIsisDb.php
+++ b/classes/PhpIsisDb.php
@@ -87,6 +87,13 @@ class PhpIsisDb implements IsisDb {
    * @see IsisDb::check()
    */  
   public function check($schema, $section = NULL) {
+    // Check API availability.
+    if (!function_exists('isis_open')) {
+      throw new Exception('Could not find function isis_open. Please check your php-isis installation.');
+      return FALSE;
+    }
+
+    // Check schema configuration.
     return SchemaDb::check($schema, $section);
   }