Changing the template hierarchy

Is there an easy way to change the WP default template hierarchy?

For instance;

Say I want to change my theme directory structure so that it completely changes from the Template Hierarchy suggested here based upon conditionals:

http://codex.wordpress.org/Template_Hierarchy

If I wanted to make sure that for all page types (is_single() is_home() etc) it always opens one template file which then instigates my own pattern to provide the output?

Thanks very much!

Solutions Collecting From Web of "Changing the template hierarchy"

Try this filter

function wpse_63614_restructure_template_hierarchy( $template ){
    return get_template_directory().'/filename.php';
}
add_filter( 'template_include', 'wpse_63614_restructure_template_hierarchy' );

The filename would be the file you would want to call in your theme folder. For child themes you would use get_stylesheet_directory instead.

EDIT:

Or as suggested by Chip Bennett and what I too feel would be better; you can use the template_redirect hook in the following manner. The priority can be set accordingly if required.

function wpse_63614_restructure_template_hierarchy(){
    include( get_template_directory().'/filename.php' );
    exit;
}
add_action( 'template_redirect', 'wpse_63614_restructure_template_hierarchy' );