tripal/tripal_chado/api/modules/tripal_chado.phylotree.api.inc

<?php

/**
 * @file
 * Provides API functions specificially for managing phylogenetic and taxonomic
 * tree records in Chado.
 */

/**
 * @defgroup tripal_phylotree_api Chado Phylotree
 * @ingroup tripal_chado_api
 * @{
 * Provides API functions specificially for managing phylogenetic and taxonomic
 * tree records in Chado.  The API consists of functions for creation,
 * retrieval, update and deltion (CRUD) for phylogenetic tree records as
 * well as importing of trees in the newick file format.
 * @}
 */


/**
 * Validates an $options array for insert or update of a phylotree record.
 *
 * If validation passes then any values that needed validation lookups
 * (such as the dbxref, analysis, leaf_type, etc) will have their approriate
 * primary_keys added to the $options array, and missing default values
 * will also be added.
 *
 * @param $val_type
 *   The type of validation. Can be either 'insert' or 'update'.
 * @param $options
 *   An array of key/value pairs containing any of the valid keys for
 *   either the chado_insert_phylotree() or chado_update_phylotree()
 *   functions.
 * @param $errors
 *   An empty array where validation error messages will be set. The keys
 *   of the array will be name of the field from the options array and the
 *   value is the error message.
 * @param $warnings
 *   An empty array where validation warning messagges will be set. The
 *   warnings should not stop an insert or an update but should be provided
 *   to the user as information by a drupal_set_message() if appropriate. The
 *   keys of the array will be name of the field from the options array and the
 *   value is the error message.
 * @return
 *   If validation failes then FALSE is returned.  Any options that do not pass
 *   validation checks will be added in the $errors array with the key being
 *   the option and the value being the error message.  If validation
 *   is successful then TRUE is returned.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_validate_phylotree($val_type, &$options, &$errors, &$warnings) {

  if ($val_type != 'insert' and $val_type != 'update') {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR, "The $val_type argument must be either 'update or 'insert'.");
  }

  // Set Defaults.
  if ($val_type == 'insert') {
    // Match by feature name.
    if (!array_key_exists('match', $options)) {
      $options['match'] = 'name';
    }
    // The regular expression is to match the entire node name.
    if (!array_key_exists('name_re', $options)) {
      $options['name_re'] = '^(.*)$';
    }
    // A dbxref is not required by Tripal but is required by the database
    // field in the phylotree table.  Therefore, if the dbxref is not provided
    // we can set this to be the null database and null dbxref which
    // is represented as 'null:local:null'
    if (!array_key_exists('dbxref', $options)) {
      $options['dbxref'] = "null:local:null";
    }
  }

  // Make sure required values are set.
  if ($val_type == 'insert') {
    if (!array_key_exists('name', $options)) {
      $errors['name'] = t('Please provide the name of the tree.');
      return FALSE;
    }
    if (!array_key_exists('description', $options)) {
      $errors['description'] = t('Please provide a description for this tree.');
      return FALSE;
    }
    if (!array_key_exists('format', $options) or !$options['format']) {
      $errors['format'] = t('Please provide a file format for the tree file.');
      return FALSE;
    }
    // Make sure the file format is correct.
    if ($options['format'] != 'newick' and $options['format'] != 'taxonomy') {
      $errors['format'] = t('The file format is not supported. Currently only the "newick" file format is supported.');
      return FALSE;
    }
  }
  else {
    // Does the phylotree ID exist and is it valid.
    if (!array_key_exists('phylotree_id', $options)) {
      $errors['phylotree_id'] = t('Please provide the ID for the tree.');
      return FALSE;
    }
    $exists = chado_select_record('phylotree', array('phylotree_id'),
        array('phylotree_id' => $options['phylotree_id']), array('has_record' => 1));
    if (!$exists) {
      $errors['phylotree_id'] = t('The phylotree_id does not exist.');
      return FALSE;
    }

  }

  // Make sure the file exists if one is specified.
  if (array_key_exists('tree_file', $options) and $options['tree_file']) {
    // If this is a numeric Drupal file then all is good, no need to check.
    if (!is_numeric($options['tree_file'])) {
      if (!file_exists($options['tree_file'])) {
        $errors['tree_file'] = t('The file provided does not exists.');
        return FALSE;
      }
    }
    // Make sure the file format is correct.
    if (!array_key_exists('format', $options) or
        ($options['format'] != 'newick' and $options['format'] != 'taxonomy')) {
      $errors['format'] = t('Please provide a supported file format. Currently only the "newick" file format is supported.');
      return FALSE;
    }

    // If no leaf type is provided then use the polypeptide term.
    if (!array_key_exists('leaf_type', $options) or !$options['leaf_type']) {
      $options['leaf_type'] = 'polypeptide';
    }
  }

  // Make sure the analysis exists.
  $analysis = NULL;
  if (array_key_exists('analysis_id', $options) and $options['analysis_id']) {
    $analysis = chado_select_record('analysis', array('analysis_id'), array('analysis_id' => $options['analysis_id']));
    if (!$analysis) {
      $errors['analysis_id'] = t('The analysis name provided does not exist.');
      return FALSE;
    }
    $options['analysis_id'] = $analysis[0]->analysis_id;
  }
  if (array_key_exists('analysis', $options) and $options['analysis']) {
    $analysis = chado_select_record('analysis', array('analysis_id'), array('name' => $options['analysis']));
    if (!$analysis) {
      $errors['analysis'] = t('The analysis ID provided does not exist.');
      return FALSE;
    }
    $options['analysis_id'] = $analysis[0]->analysis_id;
  }

  // Make sure the leaf type exists.
  $type = NULL;
  if (array_key_exists('leaf_type', $options) and $options['leaf_type']) {
    if ($options['leaf_type'] == 'taxonomy') {
      $values = array(
        'cv_id' => array(
           'name' => 'EDAM'
        ),
        'name' => 'Species tree'
      );
      $type = chado_select_record('cvterm', array('cvterm_id'), $values);
    }
    else {
      $values = array(
        'cv_id' => array(
           'name' => 'sequence'
        ),
        'name' => $options['leaf_type']
      );
      $type = chado_select_record('cvterm', array('cvterm_id'), $values);
      if (!$type) {
        $errors['leaf_type'] = t('The leaf_type provided is not a valid Sequence Ontology term: %term.');
        return FALSE;
      }
    }
    $options['type_id'] = $type[0]->cvterm_id;
  }

  // A Dbxref is required by the phylotree module, but if the
  // tree was generated in-house and the site admin doens't want to
  // assign a local dbxref then we will set it to the null db
  // and the local:null dbxref.
  if (array_key_exists('dbxref', $options)) {
    if (!$options['dbxref']) {
        $options['dbxref'] = 'null:local:null';
    }
    $matches = array();
    preg_match('/^(.*?):(.*)$/', $options['dbxref'], $matches);
    $db_name = $matches[1];
    $accession = $matches[2];
    $values = array(
      'accession' => $accession,
      'db_id' => array(
        'name' => $db_name
      ),
    );
    $dbxref = chado_generate_var('dbxref', $values);

    if (!$dbxref) {

      $db = chado_generate_var('db', array( 'name' => $db_name));

      if (!$db){
              $errors['dbxref'] = t('
              dbxref could not be created for db: %dbxref.', array('%dbxref' => $dbxref));
              return FALSE;
      }
    $dbxref =  chado_insert_record('dbxref', $values);

    if (!$dbxref){
            $errors['dbxref'] = t('
            dbxref could not be created for db: %dbxref.', array('%dbxref' => $dbxref));
            return FALSE;
    }
  }
  if (is_array($dbxref)){
    $options['dbxref_id'] = $dbxref['dbxref_id'];
    }else {
    $options['dbxref_id'] = $dbxref->dbxref_id;
  }
  }

  // Make sure the tree name is unique.
  if (array_key_exists('name', $options) and $options['name']) {
    $sql = "
      SELECT *
      FROM {phylotree} P
      WHERE
        P.name = :name
    ";
    $args = array(':name' => $options['name']);
    if ($val_type == 'update') {
      $sql .= " AND NOT P.phylotree_id = :phylotree_id";
      $args[':phylotree_id'] = $options['phylotree_id'];
    }
    $result = chado_query($sql, $args)->fetchObject();
    if ($result) {
      $errors['name'] = t("The tree name is in use by another tree. Please provide a different unique name for this tree.");
    }
  }

  return TRUE;
}
/**
 * Inserts a phylotree record into Chado.
 *
 * This function validates the options passed prior to insertion of the record,
 * and if validation passes then any values in the options array that needed
 * validation lookups (such as the dbxref, analysis, leaf_type, etc) will have
 * their approriate primary key values added to the options array.
 *
 * @param $options
 *  An array of key value pairs with the following keys required:
 *     'name':       The name of the tree. This will be displayed to users.
 *     'description: A description about the tree
 *     'anlaysis_id: The ID of the analysis to which this phylotree should be
 *                   associated.
 *     'analysis':   If the analysis_id key is not used then the analysis name
 *                   may be provided to identify the analysis to which the tree
 *                   should be associated.
 *     'leaf_type':  A sequence ontology term or the word 'organism'. If the
 *                   type is 'organism' then this tree represents a
 *                   taxonomic tree.  The default, if not specified, is the
 *                   term 'polypeptide'.
 *     'tree_file':  The path of the file containing the phylogenetic tree to
 *                   import or a Drupal managed_file numeric ID.
 *     'format':     The file format. Currently only 'newick is supported'.
 *
 *  Optional keys:
 *     'dbxref':     A database cross-reference of the form DB:ACCESSION.
 *                   Where DB is the database name, which is already present
 *                   in Chado, and ACCESSION is the unique identifier for
 *                   this tree in the remote database.
 *     'name_re':    If the leaf type is NOT 'taxonomy', then the value of
 *                   this field can be a regular expression to pull out
 *                   the name of the feature from the node label in the
 *                   intput tree. If no value is provided the entire label is
 *                   used.
 *     'match':      Set to 'uniquename' if the leaf nodes should be matched
 *                   with the feature uniquename.
 *     'load_now':   If set, the tree will be loaded immediately if a tree_file
 *                   is provided. Otherwise, the tree will be loaded via
 *                   a Tripal jobs call.
 *     'no_load':    If set the tree file will not be loaded.
 * @param $errors
 *   An empty array where validation error messages will be set. The keys
 *   of the array will be name of the field from the options array and the
 *   value is the error message.
 * @param $warnings
 *   An empty array where validation warning messagges will be set. The
 *   warnings should not stop an insert or an update but should be provided
 *   to the user as information by a drupal_set_message() if appropriate. The
 *   keys of the array will be name of the field from the options array and the
 *   value is the error message.
 * @return
 *   TRUE for success and FALSE for failure.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_insert_phylotree(&$options, &$errors, &$warnings) {
  global $user;

  $options['name_re'] = trim($options['name_re']);
  $options['leaf_type'] = trim($options['leaf_type']);
  $options['name'] = trim($options['name']);
  $options['format'] = trim($options['format']);
  $options['tree_file'] = trim($options['tree_file']);

  // Validate the incoming options.
  $success = chado_validate_phylotree('insert', $options, $errors, $warnings);
  if (!$success) {
    foreach ($errors as $field => $message) {
      tripal_report_error('tripal_phylogeny', TRIPAL_ERROR, $message);
    }
    return FALSE;
  }

  // If we're here then all is good, so add the phylotree record.
  $values = array(
    'analysis_id' => $options['analysis_id'],
    'name' => $options['name'],
    'dbxref_id' => $options['dbxref_id'],
    'comment' => $options['description'],
    'type_id' => $options['type_id'],
  );

  $phylotree = chado_insert_record('phylotree', $values);
  if (!$phylotree) {
    drupal_set_message(t('Unable to add phylotree.'), 'warning');
    tripal_report_error('tripal_phylogeny', TRIPAL_WARNING, 'Insert phylotree: Unable to create phylotree where values: %values',
        array('%values' => print_r($values, TRUE)));
    return FALSE;
  }
  $phylotree_id = $phylotree['phylotree_id'];
  $options['phylotree_id'] = $phylotree_id;

  // If the tree_file is numeric then it is a Drupal managed file and
  // we want to make the file permanent and associated with the tree.
  if (is_numeric($options['tree_file'])) {
    $file = NULL;
    $file = file_load($options['tree_file']);
    $file->status = FILE_STATUS_PERMANENT;
    $file = file_save($file);
    file_usage_add($file, 'tripal_phylogeny', $options['format'], $phylotree_id);
    $real_file_path = drupal_realpath($file->uri);
  }
  else {
    $real_file_path = $options['tree_file'];
  }

  // If caller has requested to load the file now then do so, otherwise
  // submit using a Tripal job.
  if (!array_key_exists('no_load', $options) or !$options['no_load']) {
    if (array_key_exists('load_now', $options) and $options['load_now']) {
      $args = array(
        'phylotree_id' => $phylotree_id,
        'leaf_type' => $options['leaf_type'],
        'match' => $options['match'] ? 'uniquename' : 'name',
        'name_re' => $options['name_re'],
      );
      chado_phylogeny_import_tree_file($real_file_path, $options['format'], $args);
    }
    else {
      $args = array(
          $real_file_path,
          'newick',
          array(
            'phylotree_id' => $phylotree_id,
            'leaf_type' => $options['leaf_type'],
            'match' => $options['match'] ? 'uniquename' : 'name',
            'name_re' => $options['name_re'],
          ),
      );
      if (tripal_add_job("Import Tree File: " . $file->filename, 'tripal_phylogeny',
          'chado_phylogeny_import_tree_file', $args, $user->uid)) {
          drupal_set_message(t('The tree visualizations will appear once the tree is fully imported.'));
      }
    }
  }

  return TRUE;
}

/**
 * Updates a phylotree record into Chado.
 *
 * This function validates the options passed prior to update of the record
 * and if validation passes then any values in the options array that needed
 * validation lookups (such as the dbxref, analysis, leaf_type, etc) will have
 * their approriate primary key values added to the options array. A Drupal
 * File object will be added to the options array for the tree file if one
 * is provided.
 *
 *
 * @param $phylotree_id
 *   The ID of the phylotree to update.
 * @param $options
 *  An array of key value pairs with the following optional keys:
 *     'name':       The name of the tree. This will be displayed to users.
 *     'description: A description about the tree
 *     'anlaysis_id: The ID of the analysis to which this phylotree should be
 *                   associated.
 *     'analysis':   If the analysis_id key is not used then the analysis name
 *                   may be provided to identify the analysis to which the tree
 *                   should be associated.
 *     'leaf_type':  A sequence ontology term or the word 'organism'. If the
 *                   type is 'organism' then this tree represents a
 *                   taxonomic tree.  The default, if not specified, is the
 *                   term 'polypeptide'.
 *     'tree_file':  The path of the file containing the phylogenetic tree to
 *                   import or a Drupal managed_file numeric ID.
 *     'format':     The file format. Currently only 'newick is supported'
 *     'dbxref':     A database cross-reference of the form DB:ACCESSION.
 *                   Where DB is the database name, which is already present
 *                   in Chado, and ACCESSION is the unique identifier for
 *                   this tree in the remote database.
 *     'name_re':    If the leaf type is NOT 'taxonomy', then the value of
 *                   this field can be a regular expression to pull out
 *                   the name of the feature from the node label in the
 *                   intput tree. If no value is provided the entire label is
 *                   used.
 *     'match':      Set to 'uniquename' if the leaf nodes should be matched
 *                   with the feature uniquename.
 *     'load_now':   If set, the tree will be loaded immediately if a tree_file
 *                   is provided. Otherwise, the tree will be loaded via
 *                   a Tripal jobs call.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_update_phylotree($phylotree_id, &$options) {
  global $user;

  // Validate the incoming options.
  $errors = array();
  $warnings = array();
  $success = chado_validate_phylotree('update', $options, $errors, $warnings);
  if (!$success) {
    foreach ($errors as $field => $message) {
      tripal_report_error('tripal_phylogeny', TRIPAL_ERROR, $message);
    }
    return FALSE;
  }

  // If we're here then all is good, so update the phylotree record.
  $match = array(
      'phylotree_id' => $phylotree_id,
  );
  if (array_key_exists('name', $options) and $options['name']) {
    $values['name'] = $options['name'];
  }
  if (array_key_exists('analysis_id', $options) and $options['analysis_id']) {
    $values['analysis_id'] = $options['analysis_id'];
  }
  if (array_key_exists('dbxref_id', $options) and $options['dbxref_id']) {
    $values['dbxref_id'] = $options['dbxref_id'];
  }
  if (array_key_exists('description', $options) and $options['description']) {
    $values['comment'] = $options['description'];
  }
  if (array_key_exists('type_id', $options) and $options['type_id']) {
    $values['type_id'] = $options['type_id'];
  }

  $phylotree = chado_update_record('phylotree', $match, $values, array('return_record' => TRUE));
  if (!$phylotree) {
    drupal_set_message(t('Unable to update phylotree.'), 'warning');
    tripal_report_error('tripal_phylogeny', TRIPAL_WARNING,
        'Update phylotree: Unable to update phylotree where values: %values',
        array('%values' => print_r($values, TRUE))
    );
  }

  // If we have a tree file, then import the tree.
  if (array_key_exists('tree_file', $options) and $options['tree_file']) {

    // Remove any existing nodes
    chado_delete_record('phylonode', array('phylotree_id' => $options['phylotree_id']));

    // Make sure if we already have a file that we remove the old one.
    $sql = "
      SELECT FM.fid
      FROM {file_managed} FM
        INNER JOIN {file_usage} FU on FM.fid = FU.fid
      WHERE FU.id = :id and FU.module = 'tripal_phylogeny'
    ";
    $fid = db_query($sql, array(':id' => $options['phylotree_id']))->fetchField();
    if ($fid) {
      $file = file_load($fid);
      file_delete($file, TRUE);
    }

    // If the tree_file is numeric then it is a Drupal managed file and
    // we want to make the file permanent and associated with the tree.
    if (is_numeric($options['tree_file'])) {
      $file = file_load($options['tree_file']);
      $file->status = FILE_STATUS_PERMANENT;
      $file = file_save($file);
      file_usage_add($file, 'tripal_phylogeny', 'newick', $options['phylotree_id']);

      // Add a job to parse the new node tree.
      $real_file_path = drupal_realpath($file->uri);
    }
    else {
      $real_file_path = $options['tree_file'];
    }

    // If caller has requested to load the file now then do so, otherwise
    // submit using a Tripal job.
    if (array_key_exists('load_now', $options) and $options['load_now']) {
      $args = array(
        'phylotree_id' => $options['phylotree_id'],
        'leaf_type' => $options['leaf_type'],
        'match' => $options['match'] ? 'uniquename' : 'name',
        'name_re' => $options['name_re'],
      );
      chado_phylogeny_import_tree_file($real_file_path, $options['format'], $args);
    }
    else {
      $args = array(
        $real_file_path,
        'newick',
        array(
          'phylotree_id' => $options['phylotree_id'],
          'leaf_type' => $options['leaf_type'],
          'match' => $options['match'] ? 'uniquename' : 'name',
          'name_re' => $options['name_re'],
        ),
      );
      if (tripal_add_job("Import Tree File: " . $file->filename, 'tripal_phylogeny',
          'chado_phylogeny_import_tree_file', $args, $user->uid)) {
        drupal_set_message(t('The tree visualizations will appear once the tree is fully imported.'));
      }
    }
  }

  return TRUE;
}

/**
 * Deletes a phylotree record from Chado.
 *
 * @param $phylotree_id
 *
 * @return
 *   TRUE on success, FALSE on failure.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_delete_phylotree($phylotree_id) {

  // If we don't have a phylotree id for this node then this isn't a node of
  // type chado_phylotree or the entry in the chado_phylotree table was lost.
  if (!$phylotree_id) {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
        'Please provide a phylotree_id to delete a tree.');
    return FALSE;
  }

  // Remove the tree
  $values = array('phylotree_id' => $phylotree_id);
  return chado_delete_record('phylotree', $values);
}

/**
 * Iterates through the tree and sets the left and right indicies.
 *
 * @param $tree
 *   The tree array.
 * @param $index
 *   This parameters is not used when the function is first called. It
 *   is used for recursive calls.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_assign_phylogeny_tree_indices(&$tree, &$index = 1) {
  // Assign a left and right index to each node.  The child node must
  // have a right and left index less than that of it's parents.  We
  // increment the index by 100 to give space for new nodes that might
  // be added later.
  if (array_key_exists('name', $tree)) {
    $tree['left_index'] = $index += 100;
    if (array_key_exists('is_leaf', $tree)) {
      $tree['right_index'] = $index += 100;
    }
  }
  if (array_key_exists('branch_set', $tree)) {
    foreach ($tree['branch_set'] as $key => $node) {
      chado_assign_phylogeny_tree_indices($tree['branch_set'][$key], $index);
      $tree['right_index'] = $index += 100;
    }
  }
}

/**
 * Iterates through the tree array and creates phylonodes in Chado.
 *
 * The function iterates through the tree in a top-down approach adding
 * parent internal nodes prior to leaf nodes.  Each node of the tree should have
 * the following fields:
 *
 *   -name:         The name (or label) for this node.
 *   -depth:        The depth of the node in the tree.
 *   -is_root:      Set to 1 if this node is a root node.
 *   -is_leaf:      Set to 1 if this node is a leaf node.
 *   -is_internal:  Set to 1 if this node is an internal node.
 *   -left_index:   The index of the node to the left in the tree.
 *   -right_index:  The index of the node to the right in the tree.
 *   -branch_set:   An array containing a list of nodes of that are children
 *                  of the node.
 *   -parent:       The name of the parent node.
 *   -organism_id:  The organism_id for associtating the node with an organism.
 *   -properties:   An array of key/value pairs where the key is the cvterm_id
 *                  and the value is the property value.  These properties
 *                  will be assocaited with the phylonode.
 *
 * Prior to importing the tree the indicies can be set by using the
 * chado_assign_phylogeny_tree_indices() function.
 *
 * @param $tree
 *   The tree array.
 * @param $phylotree.
 *   The phylotree object (from Chado).
 * @param $options
 *   The options provide some direction for how the tree is imported.  The
 *   following keys can be used:
 *   -taxonomy:  Set to 1 if this tree is a taxonomic tree. Set to 0
 *               otherwise.
 *   -leaf_type: Set to the leaf type name. If this is a non-taxonomic tree
 *               that is associated with features, then this should be the
 *               Sequence Ontology term for the feature (e.g. polypeptide).
 *               If this is a taxonomic tree then this option is not needed.
 *   -match:     Set to either 'name' or 'uniquename'.  This is used for
 *               matching the feature name or uniquename with the node name.
 *               This is not needed for taxonomic trees.
 *   -match_re:  Set to a regular that can be used for matching the node
 *               name with the feature name if the node name is not
 *               identical to the feature name.
 * @param $vocab
 *   Optional. An array containing a set of key/value pairs that maps node
 *   types to CV terms.  The keys must be 'root', 'internal' or 'leaf'.  If
 *   no vocab is provded then the terms provided by the tripal_phylogeny
 *   CV will be used.
 * @param $parent
 *   This argument is not needed when the funtion is first called. This
 *   function is recursive and this argument is used on recursive calls.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_phylogeny_import_tree(&$tree, $phylotree, $options, $vocab = array(), $parent = NULL) {

  // Get the vocabulary terms used to describe nodes in the tree if one
  // wasn't provided.
  if (count($vocab) == 0) {
    $vocab = chado_phylogeny_get_node_types_vocab();
  }

  if (is_array($tree) and array_key_exists('name', $tree)) {
    $values = array(
      'phylotree_id' => $phylotree->phylotree_id,
      'left_idx'  => $tree['left_index'],
      'right_idx' => $tree['right_index'],
    );
    // Add in any optional values to the $values array if they are present.
    if (!empty($tree['name']) and $tree['name'] != '') {
      $values['label'] = $tree['name'];
    }
    if (!empty($tree['length']) and $tree['length'] != '') {
      $values['distance'] = $tree['length'];
    }
    // Set the type of node.
    if ($tree['is_root']) {
      $values['type_id'] = $vocab['root']->cvterm_id;
    }
    else if ($tree['is_internal']) {
      $values['type_id'] = $vocab['internal']->cvterm_id;
      $values['parent_phylonode_id'] = $parent['phylonode_id'];
      // TOOD: a feature may be associated here but it is recommended that it
      // be a feature of type SO:match and should represent the alignment of
      // all features beneath it.
    }
    else if ($tree['is_leaf']) {
      $values['type_id'] = $vocab['leaf']->cvterm_id;
      $values['parent_phylonode_id'] = $parent['phylonode_id'];

      // Match this leaf node with an organism or feature depending on the
      // type of tree. But we can't do that if we don't have a name.
      if (!empty($tree['name']) and $tree['name'] != '') {
        if (!$options['taxonomy']) {

          // This is a sequence-based tree. Try to match leaf nodes with
          // features.
          // First, Get the Name and uniquename for the feature.
          $matches = array();
          $sel_values = array();
          if ($options['match'] == "name") {
            $sel_values['name'] = $tree['name'];
            $re = $options['name_re'];
            if (preg_match("/$re/", $tree['name'], $matches)) {
              $sel_values['name'] = $matches[1];
            }
          }
          else {
            $sel_values['uniquename'] = $tree['name'];
            $re = $options['name_re'];
            if (preg_match("/$re/", $tree['name'], $matches)) {
              $sel_values['uniquename'] = $matches[1];
            }
          }
          $sel_values['type_id'] = array(
            'name' => $options['leaf_type'],
            'cv_id' => array(
              'name' => 'sequence'
            ),
          );
          $sel_columns = array('feature_id');
          $feature = chado_select_record('feature', $sel_columns, $sel_values);
          if (count($feature) > 1) {
            // Found multiple features, cannot make an association.
          }
          else if (count($feature) == 1) {
            $values['feature_id'] = $feature[0]->feature_id;
          }
          else {
            // Could not find a feature that matches the name or uniquename
          }
        }
      }
    }

    // Insert the new node and then add it's assigned phylonode_id to the node.
    $phylonode = chado_insert_record('phylonode', $values);
    $tree['phylonode_id'] = $phylonode['phylonode_id'];

    // This is a taxonomic tree, so assocaite this node with an
    // organism if one is provided.
    if (array_key_exists('organism_id', $tree)) {
      $values = array(
        'phylonode_id' => $tree['phylonode_id'],
        'organism_id' => $tree['organism_id']
      );
      $pylonode_organism = chado_insert_record('phylonode_organism', $values);
    }

    // Associate any properties.
    if (array_key_exists('properties', $tree)) {
      foreach ($tree['properties'] as $type_id => $value) {
        $values = array(
          'phylonode_id' => $tree['phylonode_id'],
          'type_id' => $type_id,
          'value' => $value,
        );
        $pylonode_organism = chado_insert_record('phylonodeprop', $values);
      }
    }
  }
  if (is_array($tree) and array_key_exists('branch_set', $tree)) {
    foreach ($tree['branch_set'] as $key => $node) {
      chado_phylogeny_import_tree($tree['branch_set'][$key], $phylotree, $options, $vocab, $tree);
    }
  }
}

/**
 * Get the vocabulary terms used to describe nodes in the tree.
 *
 * @return
 *  Array of vocab info or FALSE on failure.
 *
 * @ingroup tripal_phylotree_api
 */
function chado_phylogeny_get_node_types_vocab() {
  // Get the vocabulary terms used to describe nodes in the tree.
  $values = array(
    'name' => 'phylo_leaf',
    'cv_id' => array(
      'name' => 'tripal_phylogeny',
    ),
  );
  $leaf = chado_generate_var('cvterm', $values);
  if (!$leaf) {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
        "Could not find the leaf vocabulary term: 'phylo_leaf'. It should " .
        "already be present as part of the tripal_phylogeny vocabulary.");
    return FALSE;
  }
  $values['name'] = 'phylo_interior';
  $internal = chado_generate_var('cvterm', $values);
  if (!$internal) {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
        "Could not find the leaf vocabulary term: 'phylo_interior'. It should " .
        "already be present as part of the tripal_phylogeny vocabulary.");
    return FALSE;
  }
  $values['name'] = 'phylo_root';
  $root = chado_generate_var('cvterm', $values);
  if (!$root) {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
        "Could not find the leaf vocabulary term: 'phylo_root'. It should " .
        "already be present as part of the tripal_phylogeny vocabulary.");
    return FALSE;
  }
  $vocab = array(
    'leaf' => $leaf,
    'internal' => $internal,
    'root' => $root,
  );
  return $vocab;
}


/**
 * Imports a tree file.
 *
 * This function is used as a wrapper for loading a phylogenetic tree using
 * any number of file loaders.
 *
 * @param $file_name
 *   The name of the file containing the phylogenetic tree to import.
 * @param $format
 *   The format of the file. Currently only the 'newick' file format is
 *   supported.
 * @param $options
 *   Options if the phylotree record already exists:
 *     'phylotree_id': The imported nodes will be associated with this tree.
 *     'leaf_type':  A sequence ontology term or the word 'organism'. If the
 *                   type is 'organism' then this tree represents a
 *                   taxonomic tree.  The default, if not specified, is the
 *                   term 'polypeptide'.
 *     'name_re':    If the leaf type is NOT 'taxonomy', then the value of
 *                   this field can be a regular expression to pull out
 *                   the name of the feature from the node label in the
 *                   intput tree. If no value is provided the entire label is
 *                   used.
 *     'match':      Set to 'uniquename' if the leaf nodes should be matched
 *                   with the feature uniquename.
 *
 *  @ingroup tripal_phylotree_api
 */
function chado_phylogeny_import_tree_file($file_name, $format, $options = array(), $job_id = NULL) {

  // Set some option details.
  if (!array_key_exists('leaf_type', $options)) {
    $options['leaf_type'] = 'polypeptide';
  }
  if (!array_key_exists('match', $options)) {
    $options['match'] = 'name';
  }
  if (!array_key_exists('name_re', $options)) {
    $options['name_re'] = '^(.*)$';
  }
  $options['name_re'] = trim($options['name_re']);

  // If a phylotree ID is not passed in then make sure we have the other
  // required fields for creating a tree.
  if (!array_key_exists('phylotree_id', $options)) {
    if (!array_key_exists('name', $options)) {
      tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
          'The phylotree_id is required for importing the tree.');
      return FALSE;
    }
  }

  // Get the phylotree record.
  $values = array('phylotree_id' => $options['phylotree_id']);
  $phylotree = chado_generate_var('phylotree', $values);

  if (!$phylotree) {
    tripal_report_error('tripal_phylogeny', TRIPAL_ERROR,
        'Could not find the phylotree using the ID provided: %phylotree_id.',
        array('%phylotree_id' => $options['phylotree_id']));
    return FALSE;
  }

  $transaction = db_transaction();
  print "\nNOTE: Loading of this tree file is performed using a database transaction. \n" .
      "If the load fails or is terminated prematurely then the entire set of \n" .
      "insertions/updates is rolled back and will not be found in the database\n\n";
  try {

    // Parse the file according to the format indicated.
    if ($format == 'newick') {
      // Parse the tree into the expected nested node format.
      module_load_include('inc', 'tripal_chado', 'includes/loaders/tripal_chado.phylotree_newick');
      $tree = tripal_phylogeny_parse_newick_file($file_name);

      // Assign the right and left indecies to the tree ndoes.
      chado_assign_phylogeny_tree_indices($tree);
    }
    // Iterate through the tree nodes and add them to Chado in accordance
    // with the details in the $options array.
    chado_phylogeny_import_tree($tree, $phylotree, $options);
  }
  catch (Exception $e) {
    $transaction->rollback();
    watchdog_exception('tripal_phylogeny', $e);
  }
}