137 lines
3.3 KiB
PHP
137 lines
3.3 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2010, 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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* Meter 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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*/
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use Volkszaehler;
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use Volkszaehler\Util;
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class MeterInterpreter extends Interpreter {
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protected $min = NULL;
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protected $max = NULL;
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protected $consumption = NULL;
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protected $resolution;
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/**
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* Calculates the consumption
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* @return float total consumption
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*/
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public function getConsumption() {
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if (is_null($this->consumption)) throw new \Exception('Data has to be processed first!');
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return $this->consumption / $this->resolution;
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}
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/**
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* Get minimum
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* @return array (0 => timestamp, 1 => value)
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*/
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public function getMin() {
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if (is_null($this->min)) throw new \Exception('Data has to be processed first!');
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return $this->min;
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}
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/**
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* Get maximum
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* @return array (0 => timestamp, 1 => value)
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*/
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public function getMax() {
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if (is_null($this->max)) throw new \Exception('Data has to be processed first!');
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return $this->max;
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}
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/**
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* Get Average
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* @return float
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*/
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public function getAverage() {
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// 3600: 3600 s/h; 1000: ms -> s; 1000: KW -> W
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return (3600 * 1000 * 1000 * $this->getConsumption()) / ($this->to - $this->from);
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}
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/**
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* Raw pulses to power conversion
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*
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* @todo untested
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* @return array with timestamp, values, and pulse count
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*/
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public function processData($count, $groupBy, $callback) {
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$this->resolution = $this->channel->getProperty('resolution');
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$this->consumption = 0;
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$pulses = parent::getData($count, $groupBy);
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$tuples = array();
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$last = $pulses->rewind();
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$next = $pulses->next();
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$next = $pulses->current();
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while ($pulses->valid()) {
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$tuple = $callback($this->raw2differential($last, $next));
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if (is_null($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 += $tuple[2];
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$tuples[] = $tuple;
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$last = $next;
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$next = $pulses->next();
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}
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return $tuples;
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}
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/**
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* Calculates the differential quotient of two consecutive pulses
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*
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* @param array $last the last pulse
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* @param array $next the next pulse
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*/
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protected function raw2differential(array $last, array $next) {
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$delta = $next[0] - $last[0];
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return array(
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($next[0] - $delta / 2), // timestamp
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$next[1] * (3600000 / (($this->resolution / 1000) * $delta)), // value
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$next[2] // num of pulses
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);
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}
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}
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?>
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