<?php
/**
 * Copyright 2017 Wim van Ravesteijn
 *
 * This file is part of AEGEE-Europe Statutory Event Applications.
 *
 * AEGEE-Europe Statutory Event Applications is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * AEGEE-Europe Statutory Event Applications is distributed in the hope
 * that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with AEGEE-Europe Statutory Event Applications.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

interface DBMethod {
	public function toQuery(IDB $db);
}

class DBMethodConcat implements DBMethod {
	private $field;

	private $appendValue;

	public function __construct($field, $appendValue) {
		$this->field = $field;
		$this->appendValue = $appendValue;
	}

	public function toQuery(IDB $db) {
		return "CONCAT(" . $db->escapeField($this->field) . ", " . $db->escapeValue($this->appendValue) . ")";
	}
}

class DBMethodCount implements DBMethod {
	private $field;

	public function __construct($field) {
		$this->field = $field;
	}

	public function toQuery(IDB $db) {
		return "COUNT(" . $db->escapeField($this->field) . ")";
	}
}

class DBMethodLeft implements DBMethod {
	private $field;

	private $length;

	public function __construct($field, $length) {
		$this->field = $field;
		$this->length = $length;
	}

	public function toQuery(IDB $db) {
		return "LEFT(" . $db->escapeField($this->field) . ", " . $db->escapeValue($this->length) . ")";
	}
}

class DBMethodLength implements DBMethod {
	private $field;

	public function __construct($field) {
		$this->field = $field;
	}

	public function toQuery(IDB $db) {
		return "LENGTH(" . $db->escapeField($this->field) . ")";
	}
}

class DBMethodLower implements DBMethod {
	private $field;

	public function __construct($field) {
		$this->field = $field;
	}

	public function toQuery(IDB $db) {
		return "LOWER(" . $db->escapeField($this->field) . ")";
	}
}

class DBMethodMax implements DBMethod {
	private $field;

	public function __construct($field) {
		$this->field = $field;
	}

	public function toQuery(IDB $db) {
		return "MAX(" . $db->escapeField($this->field) . ")";
	}
}

class DBMethodMin implements DBMethod {
	private $field;

	public function __construct($field) {
		$this->field = $field;
	}

	public function toQuery(IDB $db) {
		return "MIN(" . $db->escapeField($this->field) . ")";
	}
}
?>