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You can find the design decisions relating to this module at http://groups.drupal.org/butler. The butler module intends to provide a unified context for Drupal, through a single context object. The context object can be retrieved by calling butler_context(), but it is preferable to be passed a context object, or pass others the context object. To get a piece of contextual information, simply call ->get() on the context object with the "selector". The selector is a multi-layer selector pointing to the specific contextual item. For example, `http:get:q` will fetch the parameter `q` from the query string, and `node` will fetch the current node. Additional context may be declared in two ways: statically or dynamically. To declare the context statically, one may implement hook_butler(), returning a simple mapping of `selector` => `class name`. The selector may be any number of levels deep. To add to / change the context dynamically, you can call `->set()` on the context object. The first parameter is the selector, which can be any number of levels deep (you can, for example, override just `http:get:q`, or all of `http`). The second parameter can either be an object, in which case the ->get method is called to retrieve the context, or a static data type (string, int, float, array), in which case the selector is directly mapped to that value.
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