First commit

sites/all/modules/civicrm/CRM/Dedupe/BAO/QueryBuilder.php

@@ -0,0 +1,49 @@
+<?php
+/**
+ * Class CRM_Dedupe_BAO_QueryBuilder
+ */
+class CRM_Dedupe_BAO_QueryBuilder {
+  /**
+   * @param $rg
+   * @param string $strID1
+   * @param string $strID2
+   *
+   * @return string
+   */
+  public static function internalFilters($rg, $strID1 = 'contact1.id', $strID2 = 'contact2.id') {
+    // Add a contact id filter for dedupe by group requests and add logic
+    // to remove duplicate results with opposing orders, i.e. 1,2 and 2,1
+    if (!empty($rg->contactIds)) {
+      $cids = implode(',', $rg->contactIds);
+      return "($strID1 IN ($cids) AND ( $strID2 NOT IN ($cids) OR ($strID2 IN ($cids) AND $strID1 < $strID2) ))";
+    }
+    else {
+      return "($strID1 < $strID2)";
+    }
+  }
+
+  /**
+   * If a contact list is specified then adjust the query to ensure one contact is in that list.
+   *
+   * Doing an OR join here will lead to a server-killing unindexed query. However, a union will
+   * perform better.
+   *
+   * @param array $contactList
+   * @param string $query
+   * @param string $strID1
+   * @param string $strID2
+   *
+   * @return string
+   */
+  protected static function filterQueryByContactList(array $contactList, $query, $strID1 = 'contact1.id', $strID2 = 'contact2.id') {
+    if (empty($contactList)) {
+      return $query . " AND ($strID1 < $strID2)";
+    }
+    $contactIDs = implode(',', $contactList);
+    return "$query AND $strID1 IN ($contactIDs) AND $strID1 > $strID2
+      UNION $query AND $strID1 > $strID2 AND $strID2 IN ($contactIDs) AND $strID1 NOT IN ($contactIDs)
+    ";
+
+  }
+
+}