class views_handler_filter_in_operator

class views_handler_filter_in_operator extends views_handler_filter {
    
    /**
     *
     */
    public $value_form_type = 'checkboxes';
    
    /**
     * @var array
     * Stores all operations which are available on the form.
     */
    public $value_options = NULL;
    
    /**
     * {@inheritdoc}
     */
    public function construct() {
        parent::construct();
        $this->value_title = t('Options');
        $this->value_options = NULL;
    }
    
    /**
     * Child classes should be used to override this function and set the
     * 'value options', unless 'options callback' is defined as a valid function
     * or static public method to generate these values.
     *
     * This can use a guard to be used to reduce database hits as much as
     * possible.
     *
     * @return
     *   Return the stored values in $this->value_options if someone expects it.
     */
    public function get_value_options() {
        if (isset($this->value_options)) {
            return;
        }
        if (isset($this->definition['options callback']) && is_callable($this->definition['options callback'])) {
            if (isset($this->definition['options arguments']) && is_array($this->definition['options arguments'])) {
                $this->value_options = call_user_func_array($this->definition['options callback'], $this->definition['options arguments']);
            }
            else {
                $this->value_options = call_user_func($this->definition['options callback']);
            }
        }
        else {
            $this->value_options = array(
                t('Yes'),
                t('No'),
            );
        }
        return $this->value_options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function expose_options() {
        parent::expose_options();
        $this->options['expose']['reduce'] = FALSE;
    }
    
    /**
     * {@inheritdoc}
     */
    public function expose_form(&$form, &$form_state) {
        parent::expose_form($form, $form_state);
        $form['expose']['reduce'] = array(
            '#type' => 'checkbox',
            '#title' => t('Limit list to selected items'),
            '#description' => t('If checked, the only items presented to the user will be the ones selected here.'),
            // Safety.
'#default_value' => !empty($this->options['expose']['reduce']),
        );
    }
    
    /**
     * {@inheritdoc}
     */
    public function option_definition() {
        $options = parent::option_definition();
        $options['operator']['default'] = 'in';
        $options['value']['default'] = array();
        $options['expose']['contains']['reduce'] = array(
            'default' => FALSE,
            'bool' => TRUE,
        );
        return $options;
    }
    
    /**
     * This kind of construct makes it relatively easy for a child class to add or
     * remove functionality by overriding this function and adding/removing items
     * from this array.
     */
    public function operators() {
        $operators = array(
            'in' => array(
                'title' => t('Is one of'),
                'short' => t('in'),
                'short_single' => t('='),
                'method' => 'op_simple',
                'values' => 1,
            ),
            'not in' => array(
                'title' => t('Is not one of'),
                'short' => t('not in'),
                'short_single' => t('<>'),
                'method' => 'op_simple',
                'values' => 1,
            ),
        );
        // If the definition allows for the empty operator, add it.
        if (!empty($this->definition['allow empty'])) {
            $operators += array(
                'empty' => array(
                    'title' => t('Is empty (NULL)'),
                    'method' => 'op_empty',
                    'short' => t('empty'),
                    'values' => 0,
                ),
                'not empty' => array(
                    'title' => t('Is not empty (NOT NULL)'),
                    'method' => 'op_empty',
                    'short' => t('not empty'),
                    'values' => 0,
                ),
            );
        }
        return $operators;
    }
    
    /**
     * Build strings from the operators() for 'select' options.
     */
    public function operator_options($which = 'title') {
        $options = array();
        foreach ($this->operators() as $id => $info) {
            $options[$id] = $info[$which];
        }
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function operator_values($values = 1) {
        $options = array();
        foreach ($this->operators() as $id => $info) {
            if (isset($info['values']) && $info['values'] == $values) {
                $options[] = $id;
            }
        }
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function value_form(&$form, &$form_state) {
        $form['value'] = array();
        $options = array();
        if (empty($form_state['exposed'])) {
            // Add a select all option to the value form.
            $options = array(
                'all' => t('Select all'),
            );
        }
        $this->get_value_options();
        $options += $this->value_options;
        $default_value = (array) $this->value;
        $which = 'all';
        if (!empty($form['operator'])) {
            $source = $form['operator']['#type'] == 'radios' ? 'radio:options[operator]' : 'edit-options-operator';
        }
        if (!empty($form_state['exposed'])) {
            $identifier = $this->options['expose']['identifier'];
            if (empty($this->options['expose']['use_operator']) || empty($this->options['expose']['operator_id'])) {
                // Exposed and locked.
                $which = in_array($this->operator, $this->operator_values(1)) ? 'value' : 'none';
            }
            else {
                $source = 'edit-' . drupal_html_id($this->options['expose']['operator_id']);
            }
            if (!empty($this->options['expose']['reduce'])) {
                $options = $this->reduce_value_options();
                if (!empty($this->options['expose']['multiple']) && empty($this->options['expose']['required'])) {
                    $default_value = array();
                }
            }
            if (empty($this->options['expose']['multiple'])) {
                if (empty($this->options['expose']['required']) && (empty($default_value) || !empty($this->options['expose']['reduce']))) {
                    $default_value = 'All';
                }
                elseif (empty($default_value)) {
                    $keys = array_keys($options);
                    $default_value = array_shift($keys);
                }
                else {
                    $copy = $default_value;
                    $default_value = array_shift($copy);
                }
            }
        }
        if ($which == 'all' || $which == 'value') {
            $form['value'] = array(
                '#type' => $this->value_form_type,
                '#title' => $this->value_title,
                '#options' => $options,
                '#default_value' => $default_value,
                // These are only valid for 'select' type, but do no harm to checkboxes.
'#multiple' => TRUE,
                '#size' => count($options) > 8 ? 8 : count($options),
            );
            if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier])) {
                $form_state['input'][$identifier] = $default_value;
            }
            if ($which == 'all') {
                if (empty($form_state['exposed']) && in_array($this->value_form_type, array(
                    'checkbox',
                    'checkboxes',
                    'radios',
                    'select',
                ))) {
                    $form['value']['#prefix'] = '<div id="edit-options-value-wrapper">';
                    $form['value']['#suffix'] = '</div>';
                }
                $form['value']['#dependency'] = array(
                    $source => $this->operator_values(1),
                );
            }
        }
    }
    
    /**
     * When using exposed filters, we may be required to reduce the set.
     */
    public function reduce_value_options($input = NULL) {
        if (!isset($input)) {
            $input = $this->value_options;
        }
        // Because options may be an array of strings, or an array of mixed arrays
        // and strings (optgroups) or an array of objects, we have to
        // step through and handle each one individually.
        $options = array();
        foreach ($input as $id => $option) {
            if (is_array($option)) {
                $options[$id] = $this->reduce_value_options($option);
                continue;
            }
            elseif (is_object($option)) {
                $keys = array_keys($option->option);
                $key = array_shift($keys);
                if (isset($this->options['value'][$key])) {
                    $options[$id] = $option;
                }
            }
            elseif (isset($this->options['value'][$id])) {
                $options[$id] = $option;
            }
        }
        return $options;
    }
    
    /**
     * {@inheritdoc}
     */
    public function accept_exposed_input($input) {
        // A very special override because the All state for this type of
        // filter could have a default.
        if (empty($this->options['exposed'])) {
            return TRUE;
        }
        // If this is non-multiple and non-required, then this filter will
        // participate, but using the default settings, *if* 'limit is true.
        if (empty($this->options['expose']['multiple']) && empty($this->options['expose']['required']) && !empty($this->options['expose']['limit'])) {
            $identifier = $this->options['expose']['identifier'];
            if ($input[$identifier] == 'All') {
                return TRUE;
            }
        }
        return parent::accept_exposed_input($input);
    }
    
    /**
     * {@inheritdoc}
     */
    public function value_submit($form, &$form_state) {
        // Drupal's FAPI system automatically puts '0' in for any checkbox that
        // was not set, and the key to the checkbox if it is set.
        // Unfortunately, this means that if the key to that checkbox is 0,
        // we are unable to tell if that checkbox was set or not.
        // Luckily, the '#value' on the checkboxes form actually contains
        // *only* a list of checkboxes that were set, and we can use that
        // instead.
        $form_state['values']['options']['value'] = $form['value']['#value'];
    }
    
    /**
     * {@inheritdoc}
     */
    public function admin_summary() {
        if ($this->is_a_group()) {
            return t('grouped');
        }
        if (!empty($this->options['exposed'])) {
            return t('exposed');
        }
        $info = $this->operators();
        $this->get_value_options();
        if (!is_array($this->value)) {
            return;
        }
        $operator = check_plain($info[$this->operator]['short']);
        $values = '';
        if (in_array($this->operator, $this->operator_values(1))) {
            // Remove every element which is not known.
            foreach ($this->value as $value) {
                if (!isset($this->value_options[$value])) {
                    unset($this->value[$value]);
                }
            }
            // Choose different kind of ouput for 0, a single and multiple values.
            if (count($this->value) == 0) {
                $values = t('Unknown');
            }
            elseif (count($this->value) == 1) {
                // If any, use the 'single' short name of the operator instead.
                if (isset($info[$this->operator]['short_single'])) {
                    $operator = check_plain($info[$this->operator]['short_single']);
                }
                $keys = $this->value;
                $value = array_shift($keys);
                if (isset($this->value_options[$value])) {
                    $values = check_plain($this->value_options[$value]);
                }
                else {
                    $values = '';
                }
            }
            else {
                foreach ($this->value as $value) {
                    if ($values !== '') {
                        $values .= ', ';
                    }
                    if (drupal_strlen($values) > 8) {
                        $values .= '...';
                        break;
                    }
                    if (isset($this->value_options[$value])) {
                        $values .= check_plain($this->value_options[$value]);
                    }
                }
            }
        }
        return $operator . ($values !== '' ? ' ' . $values : '');
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $info = $this->operators();
        if (!empty($info[$this->operator]['method'])) {
            $this->{$info[$this->operator]['method']}();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function op_simple() {
        if (empty($this->value)) {
            return;
        }
        $this->ensure_my_table();
        // We use array_values() because the checkboxes keep keys and that can cause
        // array addition problems.
        $this->query
            ->add_where($this->options['group'], "{$this->table_alias}.{$this->real_field}", array_values($this->value), $this->operator);
    }
    
    /**
     * {@inheritdoc}
     */
    public function op_empty() {
        $this->ensure_my_table();
        if ($this->operator == 'empty') {
            $operator = "IS NULL";
        }
        else {
            $operator = "IS NOT NULL";
        }
        $this->query
            ->add_where($this->options['group'], "{$this->table_alias}.{$this->real_field}", NULL, $operator);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validate() {
        $this->get_value_options();
        $errors = array();
        // If the operator is an operator which doesn't require a value, there is
        // no need for additional validation.
        if (in_array($this->operator, $this->operator_values(0))) {
            return array();
        }
        if (!in_array($this->operator, $this->operator_values(1))) {
            $errors[] = t('The operator is invalid on filter: @filter.', array(
                '@filter' => $this->ui_name(TRUE),
            ));
        }
        if (is_array($this->value)) {
            if (!isset($this->value_options)) {
                // Don't validate if there are none value options provided, for example
                // for special handlers.
                return $errors;
            }
            if ($this->options['exposed'] && !$this->options['expose']['required'] && empty($this->value)) {
                // Don't validate if the field is exposed and no default value is
                // provided.
                return $errors;
            }
            // Some filter_in_operator usage uses optgroups forms, so flatten it.
            $flat_options = form_options_flatten($this->value_options, TRUE);
            // Remove every element which is not known.
            foreach ($this->value as $value) {
                if (!isset($flat_options[$value])) {
                    unset($this->value[$value]);
                }
            }
            // Choose different kind of ouput for 0, a single and multiple values.
            if (count($this->value) == 0) {
                $errors[] = t('No valid values found on filter: @filter.', array(
                    '@filter' => $this->ui_name(TRUE),
                ));
            }
        }
        elseif (!empty($this->value) && ($this->operator == 'in' || $this->operator == 'not in')) {
            $errors[] = t('The value @value is not an array for @operator on filter: @filter', array(
                '@value' => views_var_export($this->value),
                '@operator' => $this->operator,
                '@filter' => $this->ui_name(TRUE),
            ));
        }
        return $errors;
    }

}