Added drupal modules for site

5 files changed, 624 insertions, 0 deletions

diff --git a/sites/all/modules/views_tree/LICENSE.txt b/sites/all/modules/views_tree/LICENSE.txt
new file mode 100644
index 000000000..d159169d1
--- /dev/null
+++ b/sites/all/modules/views_tree/LICENSE.txt
@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/sites/all/modules/views_tree/views_tree.info b/sites/all/modules/views_tree/views_tree.info
new file mode 100644
index 000000000..4f9be2a47
--- /dev/null
+++ b/sites/all/modules/views_tree/views_tree.info
@@ -0,0 +1,13 @@
+name = Views Tree
+description = A Views style plugin to display a tree of elements using the adjacency model.
+package = Views
+core = 7.x
+dependencies[] = views
+files[] = views_tree_plugin_style_tree.inc
+
+; Information added by drupal.org packaging script on 2012-03-21
+version = "7.x-2.0"
+core = "7.x"
+project = "views_tree"
+datestamp = "1332368746"
+
diff --git a/sites/all/modules/views_tree/views_tree.module b/sites/all/modules/views_tree/views_tree.module
new file mode 100644
index 000000000..08e7d83b2
--- /dev/null
+++ b/sites/all/modules/views_tree/views_tree.module
@@ -0,0 +1,175 @@
+<?php
+
+/**
+ * Implements of hook_views_api().
+ */
+function views_tree_views_api() {
+  return array(
+    'api' => '3.0-alpha1',
+    'path' => drupal_get_path('module', 'views_tree'),
+  );
+}
+
+/**
+ * Implements of hook_theme().
+ */
+function views_tree_theme($existing, $type, $theme, $path) {
+  return array(
+    'views_tree' => array(
+      'variables' => array(
+        'view' => NULL,
+        'options' => array(),
+        'rows' => array(),
+        'title' => NULL,
+      ),
+    ),
+    'views_tree_inner' => array(
+      'variables' => array(
+        'view' => NULL,
+        'options' => array(),
+        'rows' => array(),
+        'title' => NULL,
+        'result' => array(),
+        'parent' => NULL,
+      ),
+    ),
+  );
+}
+
+/**
+ * Theme function for the tree style plugin.
+ *
+ * We need to do some weirdness that makes more sense as a theme function
+ * than as a template.
+ *
+ * @ingroup themeable
+ * @link http://drupal.org/node/355919
+ */
+function theme_views_tree($variables) {
+  $view = $variables['view'];
+  $options = $variables['options'];
+  $rows = $variables['rows'];
+  $title = $variables['title'];
+
+  $result = $view->result;
+  $fields = &$view->field;
+
+  $parents = array();
+
+  if (! $fields[$options['main_field']] instanceof views_handler_field) {
+    drupal_set_message(t('Main field is invalid: %field', array('%field' => $options['main_field'])), 'error');
+    return '';
+  }
+
+  if (! $fields[$options['parent_field']] instanceof views_handler_field) {
+    drupal_set_message(t('Parent field is invalid: %field', array('%field' => $options['parent_field'])), 'error');
+    return '';
+  }
+
+  // The field structure of Field API fields in a views result object is...
+  // ridiculous.  To avoid having to deal with it, we'll first iterate over all
+  // records and normalize out the main and parent IDs to new properties. That
+  // vastly simplifies the code that follows.  This particular magic
+  // incantation extracts the value from each record for the appropriate field
+  // specified by the user.  It then normalizes that value down to just an int,
+  // even though in some cases it is an array.  See views_tree_normalize_key().
+  // Finally, we build up a list of all main keys in the result set so that
+  // we can normalize top-level records below.
+  foreach ($result as $i => $record) {
+    $result[$i]->views_tree_main = views_tree_normalize_key($fields[$options['main_field']]->get_value($record), $fields[$options['main_field']]);
+    $result[$i]->views_tree_parent = views_tree_normalize_key($fields[$options['parent_field']]->get_value($record), $fields[$options['parent_field']]);
+
+    $parents[] = $record->views_tree_main;
+  }
+
+  // Normalize the top level of records to all point to 0 as their parent
+  // We only have to do this once, so we do it here in the wrapping function.
+  foreach ($result as $i => $record) {
+    if (! in_array($record->views_tree_parent, $parents)) {
+      $result[$i]->views_tree_parent = 0;
+    }
+  }
+
+  // Recursively render each item.
+  $tree = theme('views_tree_inner', array(
+    'view' => $view,
+    'options' => $options,
+    'rows' => $rows,
+    'title' => $title,
+    'result' => $result,
+    'parent' => 0,
+    )
+  );
+
+  return $title . $tree;
+}
+
+/**
+ * Inner recursive theme function for views tree theming.
+ *
+ * @ingroup themeable
+ * @param $view
+ * @param $options
+ * @param $row
+ * @param $title
+ * @param $result
+ *   An array representing the raw data returned from the query.
+ * @param $parent
+ *   The id of the parent entry in the call stack.
+ */
+function theme_views_tree_inner($variables) {
+  $view = $variables['view'];
+  $options = $variables['options'];
+  $rows = $variables['rows'];
+  $title = $variables['title'];
+  $result = $variables['result'];
+  $parent = $variables['parent'];
+
+  $items = array();
+  foreach ($result as $i => $record) {
+    if ($record->views_tree_parent == $parent) {
+      $variables['parent'] = $record->views_tree_main;
+      $items[] = $rows[$i] . call_user_func(__FUNCTION__, $variables);
+    }
+  }
+  return count($items) ? theme('item_list', array('items' => $items, 'type' => $options['type'])) : '';
+}
+
+/**
+ * Normalize a value out of the record to an int.
+ *
+ * If the field in question comes from Field API, then it will be an array, not
+ * an int.  We need to detect that and extract the int value we want from it.
+ * Note that because Field API structures are so free-form, we have to specifically
+ * support each field type.  For right now we support entityreference (target_id),
+ * nodereference (nid), userreference (uid), and taxonomyreference (tid).
+ *
+ * @param mixed $value
+ *   The value to normalize.  It should be either an int or an array. If an int,
+ *   it is returned unaltered.  If it's an array, we extract the int we want
+ *   and return that.
+ * @param views_handler_field $field
+ *   Metadata about the field we are extracting information from.
+ * @return int
+ *   The value of this key, normalized to an int.
+ */
+function views_tree_normalize_key($value, views_handler_field $field) {
+  if (is_array($value) && count($value)) {
+    if (isset($field->field_info['columns'])) {
+      $columns = array_keys($field->field_info['columns']);
+      foreach ($columns as $column) {
+        if (in_array($column, array('target_id', 'nid', 'uid', 'tid'))) {
+          $field_property = $column;
+          break;
+        }
+      }
+    }
+    else {
+      $field_property = '';
+    }
+    return $field_property ? $value[0][$field_property] : 0;
+  }
+  else {
+    return $value ? $value : 0;
+  }
+}
diff --git a/sites/all/modules/views_tree/views_tree.views.inc b/sites/all/modules/views_tree/views_tree.views.inc
new file mode 100644
index 000000000..2e882221e
--- /dev/null
+++ b/sites/all/modules/views_tree/views_tree.views.inc
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * Implementation of hook_views_plugins()
+ */
+function views_tree_views_plugins() {
+  $plugin = array(
+    'style' => array(
+      'tree' => array(
+        'title' => t('Tree (Adjacency model)'),
+        'help' => t('Display the results as a nested tree'),
+        'handler' => 'views_tree_plugin_style_tree',
+        'theme' => 'views_tree',
+        'uses options' => TRUE,
+        'uses row plugin' => TRUE,
+        'uses fields' => TRUE,
+        'uses grouping' => FALSE,
+        'type' => 'normal',
+        'parent' => 'list',
+        //'path' => drupal_get_path('module', 'views_tree'),
+      ),
+    ),
+  );
+
+  return $plugin;
+}
+
diff --git a/sites/all/modules/views_tree/views_tree_plugin_style_tree.inc b/sites/all/modules/views_tree/views_tree_plugin_style_tree.inc
new file mode 100644
index 000000000..14b4fe4a5
--- /dev/null
+++ b/sites/all/modules/views_tree/views_tree_plugin_style_tree.inc
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * @file
+ * Contains the list style plugin.
+ */
+
+/**
+ * Style plugin to render each item in a slideshow of an ordered or unordered list.
+ *
+ * @ingroup views_style_plugins
+ */
+class views_tree_plugin_style_tree extends views_plugin_style_list {
+
+  /**
+   * Set default options
+   */
+  function option_definition() {
+    $options = parent::option_definition();
+    $options['class'] = array('default' => '');
+    $options['wrapper_class'] = array('default' => 'item-list');
+    $options['main_field'] = array('default' => '');
+    $options['parent_field'] = array('default' => '');
+
+    return $options;
+  }
+
+  /**
+   * Render the given style.
+   */
+  function options_form(&$form, &$form_state) {
+    parent::options_form($form, $form_state);
+
+    $fields = array('' => t('<None>'));
+
+    foreach ($this->display->handler->get_handlers('field') as $field => $handler) {
+      if ($label = $handler->label()) {
+        $fields[$field] = $label;
+      }
+      else {
+        $fields[$field] = $handler->ui_name();
+      }
+    }
+
+    $events = array('click' => t('On Click'), 'mouseover' => t('On Mouseover'));
+
+    $form['type']['#description'] = t('Whether to use an ordered or unordered list for the retrieved items. Most use cases will prefer Unordered.');
+
+    // Unused by the views tree module at this time.
+    unset($form['wrapper_class']);
+    unset($form['class']);
+
+    $form['main_field'] = array(
+      '#type' => 'select',
+      '#title' => t('Main field'),
+      '#options' => $fields,
+      '#default_value' => $this->options['main_field'],
+      '#description' => t('Select the field with the unique identifier for each record.'),
+      '#required' => TRUE,
+    );
+
+    $form['parent_field'] = array(
+      '#type' => 'select',
+      '#title' => t('Parent field'),
+      '#options' => $fields,
+      '#default_value' => $this->options['parent_field'],
+      '#description' => t('Select the field that contains the unique identifier of the record\'s parent.'),
+    );
+  }
+}