class views_handler_filter_boolean_operator

class views_handler_filter_boolean_operator extends views_handler_filter {
    
    /**
     * Exposed filter options.
     */
    public $always_multiple = TRUE;
    
    /**
     * Don't display empty space where the operator would be.
     */
    public $no_operator = TRUE;
    
    /**
     * Whether to accept NULL as a false value or not.
     */
    public $accept_null = FALSE;
    
    /**
     * {@inheritdoc}
     */
    public function construct() {
        $this->value_value = t('True');
        if (isset($this->definition['label'])) {
            $this->value_value = $this->definition['label'];
        }
        if (isset($this->definition['accept null'])) {
            $this->accept_null = (bool) $this->definition['accept null'];
        }
        elseif (isset($this->definition['accept_null'])) {
            $this->accept_null = (bool) $this->definition['accept_null'];
        }
        $this->value_options = NULL;
        parent::construct();
    }
    
    /**
     * Return the possible options for this filter.
     *
     * Child classes should override this function to set the possible values
     * for the filter.  Since this is a boolean filter, the array should have
     * two possible keys: 1 for "True" and 0 for "False", although the labels
     * can be whatever makes sense for the filter.  These values are used for
     * configuring the filter, when the filter is exposed, and in the admin
     * summary of the filter.  Normally, this should be static data, but if it's
     * dynamic for some reason, child classes should use a guard to reduce
     * database hits as much as possible.
     */
    public function get_value_options() {
        if (isset($this->definition['type'])) {
            if ($this->definition['type'] == 'yes-no') {
                $this->value_options = array(
                    1 => t('Yes'),
                    0 => t('No'),
                );
            }
            if ($this->definition['type'] == 'on-off') {
                $this->value_options = array(
                    1 => t('On'),
                    0 => t('Off'),
                );
            }
            if ($this->definition['type'] == 'enabled-disabled') {
                $this->value_options = array(
                    1 => t('Enabled'),
                    0 => t('Disabled'),
                );
            }
        }
        // Provide a fallback if the above didn't set anything.
        if (!isset($this->value_options)) {
            $this->value_options = array(
                1 => t('True'),
                0 => t('False'),
            );
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['value']['default'] = FALSE;
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function operator_form(&$form, &$form_state) {
        $form['operator'] = array();
    }
    
    /**
     * {@inheritdoc}
     */
    public function value_form(&$form, &$form_state) {
        if (empty($this->value_options)) {
            // Initialize the array of possible values for this filter.
            $this->get_value_options();
        }
        if (!empty($form_state['exposed'])) {
            // Exposed filter: use a select box to save space.
            $filter_form_type = 'select';
        }
        else {
            // Configuring a filter: use radios for clarity.
            $filter_form_type = 'radios';
        }
        $form['value'] = array(
            '#type' => $filter_form_type,
            '#title' => $this->value_value,
            '#options' => $this->value_options,
            '#default_value' => $this->value,
        );
        if (!empty($this->options['exposed'])) {
            $identifier = $this->options['expose']['identifier'];
            if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier])) {
                $form_state['input'][$identifier] = $this->value;
            }
            // If we're configuring an exposed filter, add an <Any> option.
            if (empty($form_state['exposed']) || empty($this->options['expose']['required'])) {
                $any_label = variable_get('views_exposed_filter_any_label', 'new_any') == 'old_any' ? '<Any>' : t('- Any -');
                if ($form['value']['#type'] != 'select') {
                    $any_label = check_plain($any_label);
                }
                $form['value']['#options'] = array(
                    'All' => $any_label,
                ) + $form['value']['#options'];
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function value_validate($form, &$form_state) {
        if ($form_state['values']['options']['value'] == 'All' && !empty($form_state['values']['options']['expose']['required'])) {
            form_set_error('value', t('You must select a value unless this is an non-required exposed filter.'));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function admin_summary() {
        if ($this->is_a_group()) {
            return t('grouped');
        }
        if (!empty($this->options['exposed'])) {
            return t('exposed');
        }
        if (empty($this->value_options)) {
            $this->get_value_options();
        }
        // Now that we have the valid options for this filter, just return the
        // human-readable label based on the current value.  The value_options
        // array is keyed with either 0 or 1, so if the current value is not
        // empty, use the label for 1, and if it's empty, use the label for 0.
        return $this->value_options[!empty($this->value)];
    }
    
    /**
     * {@inheritdoc}
     */
    public function expose_options() {
        parent::expose_options();
        $this->options['expose']['operator_id'] = '';
        $this->options['expose']['label'] = $this->value_value;
        $this->options['expose']['required'] = TRUE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $this->ensure_my_table();
        $field = "{$this->table_alias}.{$this->real_field}";
        if (empty($this->value)) {
            if ($this->accept_null) {
                $or = db_or()->condition($field, 0, '=')
                    ->condition($field, NULL, 'IS NULL');
                $this->query
                    ->add_where($this->options['group'], $or);
            }
            else {
                $this->query
                    ->add_where($this->options['group'], $field, 0, '=');
            }
        }
        else {
            if (!empty($this->definition['use equal'])) {
                $this->query
                    ->add_where($this->options['group'], $field, 1, '=');
            }
            else {
                $this->query
                    ->add_where($this->options['group'], $field, 0, '<>');
            }
        }
    }

}