From d547587ac6c0f765a983a746adb03490a9e74502 Mon Sep 17 00:00:00 2001
From: Silvio <s1lv10@uol.com.br>
Date: Wed, 4 Aug 2010 14:36:20 -0300
Subject: Checking for denied combinations

---
 lib/sfIsisImporter.class.php | 101 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 100 insertions(+), 1 deletion(-)

diff --git a/lib/sfIsisImporter.class.php b/lib/sfIsisImporter.class.php
index 32fde7d..4b46455 100644
--- a/lib/sfIsisImporter.class.php
+++ b/lib/sfIsisImporter.class.php
@@ -99,6 +99,7 @@ class sfIsisImporter extends IsisConnector
    *
    * @param string $base_model Model to use
    * @param int    $entry      Entry number
+   * @todo                     Audit: which field/subfields combination are denied?
    */
   public function addEntry($base_model, $entry)
   {
@@ -113,7 +114,10 @@ class sfIsisImporter extends IsisConnector
       // Dispatch to custom import procedures.
       foreach (new IsisMethodIterator($this) as $method => $field)
       {
-        $this->{$method}($model, $field);
+        if (!$this->hasDeniedCombinations($base_model, $field))
+        {
+          $this->{$method}($model, $field);
+        }
       }      
 
       $model->save();
@@ -431,4 +435,99 @@ class sfIsisImporter extends IsisConnector
 
     return $element;
   }
+
+  /**
+   * Check denied combinations inside a field.
+   *
+   * @param  string  $model Model name
+   * @param  array   $field Field data from ISIS database schema
+   * @return boolean        True if has a denied combination, false otherwise 
+   * @todo                  Test
+   */
+  public function hasDeniedCombinations($model, $field)
+  {
+    if (method_exists($this, 'getDeniedCombinations'))
+    {
+      foreach ($this->getDeniedCombinations($model, $field) as $combination)
+      {
+        $has = true;
+
+        foreach ($combination as $item)
+        {
+          foreach (new IsisRowIterator($this, $field) as $row)
+          {
+            if (!$this->hasDeniedItem($field, $item, $row))
+            {
+              $has = false;
+              break 2;
+            }
+          }
+        }
+
+        if ($has)
+        {
+          $denied[$row] = $combination;
+        }
+      }
+    }
+
+    if (isset($denied))
+    {
+      foreach ($denied as $row => $combination)
+      {
+        $combination = implode(',', $combination);
+        $this->log("Found denied combination for row $row: $combination");
+      }
+
+      return true;
+    }
+
+    return false;
+  }
+
+  /**
+   * Check if a field has a denied item.
+   *
+   * @param  array   $field Field data from ISIS database schema
+   * @param  string  $item  Item code
+   * @param  int     $row   Row number
+   * @return boolean        True if has a denied combination, false otherwise 
+   * @todo                  Test
+   */
+  public function hasDeniedItem($field, $item, $row)
+  {
+    // Default condition: presence requirement for an item.
+    $condition = true;
+
+    // Check if item has the negation (absence) requirement for an item.
+    if (substr($item, 0, 1) == '!')
+    {
+      $item      = substr($item, 1);
+      $condition = false;
+    }
+
+    // Check if the item exists.
+    $has = $this->hasItem($field, $item, $row);
+
+    if ($condition == true)
+    {
+      // If the condition is true, a denied combination won't be fulfilled if
+      // the item is not present.
+      if (!$has)
+      {
+        return false;
+      }
+    }
+    else
+    {
+      // If the condition is false, a denied combination won't be fulfilled if
+      // the item is present.
+      if ($has)
+      {
+        return false;
+      }
+    }
+
+    return true;
+  }
 }
-- 
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