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<?php namespace ProcessWire;

/**
 * ProcessWire Fieldgroups Array
 *
 * WireArray of Fieldgroup instances as used by Fieldgroups class. 
 *
 * ProcessWire 3.x, Copyright 2016 by Ryan Cramer
 * https://processwire.com
 *
 *
 */
class FieldgroupsArray extends WireArray {

    /**
     * Per WireArray interface, this class only carries Fieldgroup instances
     *
     */
    public function isValidItem($item) {
        return $item instanceof Fieldgroup;
    }

    /**
     * Per WireArray interface, items are keyed by their ID
     *
     */
    public function getItemKey($item) {
        return $item->id;
    }

    /**
     * Per WireArray interface, keys must be integers
     *
     */
    public function isValidKey($key) {
        return is_int($key);
    }

    /**
     * Per WireArray interface, return a blank Fieldgroup
     *
     */
    public function makeBlankItem() {
        return $this->wire(new Fieldgroup());
    }

}