<?php
/**
 * Field query
 *
 * @uses Elastica_Query_Abstract
 * @category Xodoa
 * @package Elastica
 * @author Nicolas Ruflin <hide@address.com>
 * @link http://www.elasticsearch.org/guide/reference/query-dsl/field-query.html
 */
class Elastica_Query_Field extends Elastica_Query_Abstract
{
    /**
     * Field for object
     *
     * @var string Field for object
     */
    protected $_field = '';

    /**
     * Query string
     *
     * @var string Query string
     */
    protected $_queryString = '';

    /**
     * Creates field query object. Calls setField and setQuery with argument
     *
     * @param string $field       OPTIONAL field for object
     * @param string $queryString OPTIONAL Query string for object
     */
    public function __construct($field = '', $queryString = '')
    {
        $this->setField($field);
        $this->setQueryString($queryString);
    }

    /**
     * Sets the field
     *
     * @param  string               $field Field
     * @return Elastica_Query_Field Current object
     */
    public function setField($field)
    {
        $this->_field = $field;

        return $this;
    }

    /**
     * Sets a new query string for the object
     *
     * @param  string               $queryString Query string
     * @return Elastica_Query_Field Current object
     */
    public function setQueryString($queryString)
    {
        if (!is_string($queryString)) {
            throw new Elastica_Exception_Invalid('Parameter has to be a string');
        }

        $this->_queryString = $queryString;

        return $this;
    }

    /**
     * Converts query to array
     *
     * @return array Query array
     * @see Elastica_Query_Abstract::toArray()
     */
    public function toArray()
    {
        $this->setParam($this->_field, array('query' => $this->_queryString));

        return parent::toArray();
    }
}