120 lines
2.8 KiB
PHP
120 lines
2.8 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2011, The volkszaehler.org project
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* @package default
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* @license http://www.opensource.org/licenses/gpl-license.php GNU Public License
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*/
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/*
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* This file is part of volkzaehler.org
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*
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* volkzaehler.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* volkzaehler.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with volkszaehler.org. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace Volkszaehler\Interpreter;
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/**
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* Sensor interpreter
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*
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* @package default
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* @author Steffen Vogel <info@steffenvogel.de>
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*/
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use Volkszaehler\Util;
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class SensorInterpreter extends Interpreter {
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protected $consumption = NULL; // in Wms (Watt milliseconds)
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protected $min = NULL;
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protected $max = NULL;
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protected $first = NULL;
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protected $last = NULL;
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/**
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* Calculates the consumption
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*
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* @return float total consumption in Wh
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*/
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public function getConsumption() {
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return $this->consumption / 3600000; // convert to Wh
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}
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/**
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* Get minimum
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*
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* @return array (0 => timestamp, 1 => value)
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*/
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public function getMin() {
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return ($this->min) ? array_map('floatval', array_slice($this->min, 0 , 2)) : NULL;
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}
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/**
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* Get maximum
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*
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* @return array (0 => timestamp, 1 => value)
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*/
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public function getMax() {
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return ($this->max) ? array_map('floatval', array_slice($this->max, 0 , 2)) : NULL;
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}
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/**
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* Get Average
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*
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* @return float 3600: 3600 s/h; 1000: ms -> s
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*/
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public function getAverage() {
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if ($consumption = $this->getConsumption()) {
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$delta = $this->last[0] - $this->first[0];
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return (3600 * 1000 * $consumption) / $delta;
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}
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else { // prevents division by zero
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return 0;
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}
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}
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public function processData($callback) {
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$data = parent::getData();
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$tuples = array();
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$last = $data->rewind();
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$next = $data->next();
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while ($data->valid()) {
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$tuple = $callback(array(
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(float) $next[0],
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(float) $next[1] / $next[2],
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(int) $next[2]
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));
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if (is_null($this->max) || $tuple[1] > $this->max[1]) {
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$this->max = $tuple;
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}
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if (is_null($this->min) || $tuple[1] < $this->min[1]) {
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$this->min = $tuple;
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}
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$this->consumption += $next[1] * ($next[0] - $last[0]);
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$tuples[] = $tuple;
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$last = $next;
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$next = $data->next();
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}
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$this->first = reset($tuples);
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$this->last = end($tuples);
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return $tuples;
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}
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}
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?>
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