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public override bool CanReduce { get { return true; } } public override Expression Reduce() { return Expression.Call( null, METHOD, Expression.Constant(text)); } public override ExpressionType NodeType { get { return ExpressionType.Extension; } } public override Type Type { get { return _METHOD.ReturnType; } } public override string ToString() { return "print " + text; } } There are two basic requirements we need to meet when implementing a custom expression class. First, our class must derive directly or indirectly from System.Linq.Expressions.Expression. Second, the NodeType property of our class must return ExpressionType.Extension. Beyond those requirements, since we want our PrintExpression to be able to reduce to a MethodCallExpression, we make the CanReduce property of our class return true. The actual logic that performs the reduction is in the Reduce method. As you can see in Listing 2-28, in the Reduce method, we simply invoke the Expression.Call factory method to create and then return an instance of MethodCallExpression that represents a call to Console.WriteLine. Last but not least, don t forget to take care of the Type property. In our case, our expression s value is the same as the return value of the call to Console.WriteLine. And that value s type is METHOD.ReturnType. Now that we have the PrintExpression class defined, let s see how it s used. Because all the printing-related code is modularized into the ExpressionHelper.Print method, we don t need to make changes all over the place in our code. All we need is modify the ExpressionHelper.Print method to use our PrintExpression class like the code snippet below shows: public class ExpressionHelper { public static Expression Print(string text) { return new PrintExpression(text); } }

The path plusone/vote/3 translates into the PHP function call plusone_vote(3) (see 4, about Drupal s menu/callback system, for more details). /** * Called by jQuery, or by browser if JavaScript is disabled. * Submits the vote request. If called by jQuery, returns JSON. * If called by the browser, returns page with updated vote total. */ function plusone_vote($nid) { global $user; $nid = (int)$nid; // Authors may not vote on their own posts. We check the node table // to see if this user is the author of the post. $is_author = db_query('SELECT uid from {node} where nid = :nid AND uid = :uid', array(":nid" => (int)$nid, ":uid" => (int)$user->uid))->fetchField(); if ($nid > 0 && !$is_author) { // get current vote count for this user; $vote_count = plusone_get_vote($nid, $user->uid); echo "Vote count is: $vote_count<br/>"; if (!$vote_count) { echo "Yep was existing votes<br/>"; // Delete existing vote count for this user. db_delete('plusone_votes') ->condition('uid', $user->uid) ->condition('nid', $nid) ->execute(); db_insert('plusone_votes') ->fields(array( 'uid' => $user->uid, 'nid' => $nid, 'vote_count' => $vote_count + 1, )) ->execute(); } } $total_votes = plusone_get_total($nid); // Check to see if jQuery made the call. The AJAX call used // the POST method and passed in the key/value pair js = 1. if (!empty($_POST['js'])) { // jQuery made the call // This will return results to jQuery's request drupal_json(array( 'total_votes' => $total_votes, 'voted' => t('You Voted') ) ); exit(); }

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;---------------------------------------------------------------;Account Policies - Password Policy ;---------------------------------------------------------------MinimumPasswordAge = 2 MaximumPasswordAge = 42 MinimumPasswordLength = 8 PasswordComplexity = 1 PasswordHistorySize = 24 ClearTextPassword = 0 LSAAnonymousNameLookup = 0 EnableGuestAccount = 0 ;---------------------------------------------------------------;Account Policies - Lockout Policy ;---------------------------------------------------------------LockoutBadCount = 5 ResetLockoutCount = 30 LockoutDuration = -1 ;---------------------------------------------------------------;Local Policies - Security Options ;---------------------------------------------------------------;DC Only ;ForceLogoffWhenHourExpire = 1 ;NewAdministatorName = ;NewGuestName = ;SecureSystemPartition

// It was a non-JavaScript call Redisplay the entire page // with the updated vote total by redirecting to node/$nid // (or any URL alias that has been set for node/$nid) $path = drupal_get_path_alias('node/' $nid); drupal_goto($path); } The preceding plusone_vote() function saves the current vote and returns information to jQuery in the form of an associative array containing the new total and the string You voted, which replaces the Vote text underneath the voting widget This array is passed into drupal_json(), which converts PHP variables into their JavaScript equivalents, in this case converting a PHP associative array to a JavaScript object, and sets the HTTP header to Content-type: text/javascript For more on how JSON works, see http://enwikipediaorg/wiki/JSON Notice that we ve written the preceding function to degrade gracefully.

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