0305a6ce3b
updated proxies renamed Definition class improved JSON definitions of entities and properties
140 lines
No EOL
3.2 KiB
PHP
140 lines
No EOL
3.2 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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class MeterInterpreter extends Interpreter {
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/**
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* Calculates the consumption for interval speciefied by $from and $to
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*
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* @todo untested
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*/
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public function getConsumption() {
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$sql = 'SELECT SUM(value) AS count
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FROM data
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WHERE
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channel_id = ' . (int) $this->id . ' &&
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' . self::buildTimeFilterSQL($this->from, $this->to) . '
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GROUP BY channel_id';
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$result = $this->dbh->query($sql)->rewind();
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return $result['count'] / $this->resolution / 1000; // returns Wh
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}
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/**
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*
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*/
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public function getMin() {
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$data = $this->getData();
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$min = current($data);
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foreach ($data as $reading) {
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if ($reading['value '] < $min['value']) {
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$min = $reading;
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}
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}
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return $min;
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}
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/**
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* @return array
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*/
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public function getMax() {
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$data = $this->getData();
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$max = current($data);
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foreach ($data as $reading) {
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if ($reading['value '] > $max['value']) {
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$max = $reading;
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}
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}
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return $max;
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}
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/**
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* @todo calculate timeinterval if no params were given
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* @return float
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*/
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public function getAverage() {
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return $this->getConsumption() / ($this->to - $this->from) / 1000; // return W
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}
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/**
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* Just a passthrough of raw data
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*/
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public function getPulses($groupBy = NULL) {
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return parent::getData($groupBy);
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}
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/**
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* Raw pulses to power conversion
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*
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* @todo untested
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* @return array with timestamp and values in [W]
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*/
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public function getValues($groupBy = NULL) {
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$pulses = parent::getData($groupBy);
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$values = array();
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foreach ($pulses as $pulse) {
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if (isset($last)) {
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$values[] = $this->raw2differential($last, $pulse);
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$last = $pulse;
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}
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else {
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$last = $pulse;
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}
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}
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return $values;
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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] - $last[0];
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return array(
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(int) ($next[0] - $delta / 2), // timestamp
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$next[1] * (3600000 / (($this->channel->getProperty('resolution')->getValue() / 1000) * $delta)), // value
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(isset($next[2])) ? $next[2] : 1
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);
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}
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}
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?>
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