0305a6ce3b
updated proxies renamed Definition class improved JSON definitions of entities and properties
118 lines
No EOL
2.8 KiB
PHP
118 lines
No EOL
2.8 KiB
PHP
<?php
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/**
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* @package default
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* @copyright Copyright (c) 2010, The volkszaehler.org project
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* @license http://www.gnu.org/licenses/gpl.txt 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\Iterator;
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use Doctrine\DBAL;
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/**
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* @author Steffen Vogel <info@steffenvogel.de>
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* @package default
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*/
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class DataAggregationIterator extends DataIterator {
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protected $packageSize; // count of readings in tuple
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protected $aggregatedSize; // total readings
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protected $aggregatedKey = -1;
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/**
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* Constructor
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*
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* @param \PDOStatement $stmt
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* @param unknown_type $size
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* @param unknown_type $tuples
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*/
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public function __construct(\PDOStatement $stmt, $size, $tuples) {
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parent::__construct($stmt, $size);
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if ($tuples < $this->size) { // return $tuples values
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$this->packageSize = floor($this->size / $tuples);
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$this->aggregatedSize = $tuples;
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}
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else { // return all values or grouped by year, month, week...
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$this->packageSize = 1;
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$this->aggregatedSize = $this->size;
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}
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}
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/**
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* Aggregate data
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*/
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public function next() {
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$current = array (0, 0);
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for ($c = 0; $c < $this->packageSize; $c++) {
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parent::next();
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if (parent::valid()) {
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$tuple = parent::current();
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$current[1] += $tuple[1];
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}
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else {
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$this->current = FALSE;
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return;
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}
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}
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$this->aggregatedKey++;
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$this->current = $current;
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$this->current[0] = $tuple[0]; // the last timestamp of a package
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$this->current[2] = $this->packageSize; // how many pulses do we have aggregated? how accurate is our result?
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}
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/**
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* @return array with data
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*/
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public function current() {
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return $this->current;
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}
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/**
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* @return integer the nth data row
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*/
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public function key() {
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return $this->aggregatedKey;
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}
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/**
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* Rewind the iterator
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*
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* Should only be called once
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* PDOStatements doest support rewind()
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*/
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public function rewind() {
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parent::rewind();
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$offset = $this->size - 1 - $this->aggregatedSize * $this->packageSize;
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for ($i = 0; $i < $offset; $i++) {
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parent::next();
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}
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$this->next();
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}
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/**
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* Getter & setter
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*/
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public function getPackageSize() { return $this->packageSize; }
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}
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?>
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