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460 lines
16 KiB
PHP
460 lines
16 KiB
PHP
<?php
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/**
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* Class representing vFreebusy components.
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*
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* $Horde: framework/iCalendar/iCalendar/vfreebusy.php,v 1.16.10.17 2008/09/17 08:46:57 jan Exp $
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*
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* Copyright 2003-2008 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you
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* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
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*
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* @todo Don't use timestamps
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*
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* @author Mike Cochrane <mike@graftonhall.co.nz>
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* @since Horde 3.0
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* @package Horde_iCalendar
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*/
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class Horde_iCalendar_vfreebusy extends Horde_iCalendar {
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var $_busyPeriods = array();
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var $_extraParams = array();
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/**
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* Returns the type of this calendar component.
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*
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* @return string The type of this component.
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*/
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function getType()
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{
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return 'vFreebusy';
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}
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/**
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* Parses a string containing vFreebusy data.
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*
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* @param string $data The data to parse.
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*/
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function parsevCalendar($data, $type = null, $charset = null)
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{
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parent::parsevCalendar($data, 'VFREEBUSY', $charset);
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// Do something with all the busy periods.
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foreach ($this->_attributes as $key => $attribute) {
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if ($attribute['name'] != 'FREEBUSY') {
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continue;
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}
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foreach ($attribute['values'] as $value) {
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$params = isset($attribute['params'])
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? $attribute['params']
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: array();
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if (isset($value['duration'])) {
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$this->addBusyPeriod('BUSY', $value['start'], null,
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$value['duration'], $params);
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} else {
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$this->addBusyPeriod('BUSY', $value['start'],
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$value['end'], null, $params);
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}
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}
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unset($this->_attributes[$key]);
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}
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}
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/**
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* Returns the component exported as string.
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*
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* @return string The exported vFreeBusy information according to the
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* iCalender format specification.
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*/
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function exportvCalendar()
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{
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foreach ($this->_busyPeriods as $start => $end) {
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$periods = array(array('start' => $start, 'end' => $end));
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$this->setAttribute('FREEBUSY', $periods,
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isset($this->_extraParams[$start])
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? $this->_extraParams[$start] : array());
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}
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$res = parent::_exportvData('VFREEBUSY');
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foreach ($this->_attributes as $key => $attribute) {
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if ($attribute['name'] == 'FREEBUSY') {
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unset($this->_attributes[$key]);
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}
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}
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return $res;
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}
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/**
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* Returns a display name for this object.
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*
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* @return string A clear text name for displaying this object.
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*/
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function getName()
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{
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$name = '';
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$method = !empty($this->_container) ?
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$this->_container->getAttribute('METHOD') : 'PUBLISH';
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if (is_a($method, 'PEAR_Error') || $method == 'PUBLISH') {
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$attr = 'ORGANIZER';
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} elseif ($method == 'REPLY') {
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$attr = 'ATTENDEE';
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}
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$name = $this->getAttribute($attr, true);
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if (!is_a($name, 'PEAR_Error') && isset($name[0]['CN'])) {
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return $name[0]['CN'];
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}
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$name = $this->getAttribute($attr);
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if (is_a($name, 'PEAR_Error')) {
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return '';
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} else {
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$name = parse_url($name);
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return $name['path'];
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}
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}
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/**
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* Returns the email address for this object.
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*
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* @return string The email address of this object's owner.
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*/
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function getEmail()
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{
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$name = '';
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$method = !empty($this->_container)
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? $this->_container->getAttribute('METHOD') : 'PUBLISH';
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if (is_a($method, 'PEAR_Error') || $method == 'PUBLISH') {
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$attr = 'ORGANIZER';
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} elseif ($method == 'REPLY') {
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$attr = 'ATTENDEE';
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}
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$name = $this->getAttribute($attr);
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if (is_a($name, 'PEAR_Error')) {
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return '';
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} else {
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$name = parse_url($name);
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return $name['path'];
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}
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}
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/**
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* Returns the busy periods.
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*
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* @return array All busy periods.
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*/
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function getBusyPeriods()
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{
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return $this->_busyPeriods;
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}
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/**
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* Returns any additional freebusy parameters.
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*
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* @return array Additional parameters of the freebusy periods.
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*/
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function getExtraParams()
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{
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return $this->_extraParams;
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}
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/**
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* Returns all the free periods of time in a given period.
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*
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* @param integer $startStamp The start timestamp.
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* @param integer $endStamp The end timestamp.
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*
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* @return array A hash with free time periods, the start times as the
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* keys and the end times as the values.
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*/
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function getFreePeriods($startStamp, $endStamp)
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{
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$this->simplify();
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$periods = array();
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// Check that we have data for some part of this period.
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if ($this->getEnd() < $startStamp || $this->getStart() > $endStamp) {
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return $periods;
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}
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// Locate the first time in the requested period we have data for.
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$nextstart = max($startStamp, $this->getStart());
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// Check each busy period and add free periods in between.
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foreach ($this->_busyPeriods as $start => $end) {
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if ($start <= $endStamp && $end >= $nextstart) {
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if ($nextstart <= $start) {
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$periods[$nextstart] = min($start, $endStamp);
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}
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$nextstart = min($end, $endStamp);
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}
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}
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// If we didn't read the end of the requested period but still have
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// data then mark as free to the end of the period or available data.
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if ($nextstart < $endStamp && $nextstart < $this->getEnd()) {
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$periods[$nextstart] = min($this->getEnd(), $endStamp);
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}
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return $periods;
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}
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/**
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* Adds a busy period to the info.
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*
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* This function may throw away data in case you add a period with a start
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* date that already exists. The longer of the two periods will be chosen
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* (and all information associated with the shorter one will be removed).
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*
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* @param string $type The type of the period. Either 'FREE' or
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* 'BUSY'; only 'BUSY' supported at the moment.
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* @param integer $start The start timestamp of the period.
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* @param integer $end The end timestamp of the period.
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* @param integer $duration The duration of the period. If specified, the
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* $end parameter will be ignored.
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* @param array $extra Additional parameters for this busy period.
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*/
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function addBusyPeriod($type, $start, $end = null, $duration = null,
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$extra = array())
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{
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if ($type == 'FREE') {
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// Make sure this period is not marked as busy.
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return false;
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}
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// Calculate the end time if duration was specified.
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$tempEnd = is_null($duration) ? $end : $start + $duration;
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// Make sure the period length is always positive.
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$end = max($start, $tempEnd);
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$start = min($start, $tempEnd);
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if (isset($this->_busyPeriods[$start])) {
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// Already a period starting at this time. Change the current
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// period only if the new one is longer. This might be a problem
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// if the callee assumes that there is no simplification going
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// on. But since the periods are stored using the start time of
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// the busy periods we have to throw away data here.
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if ($end > $this->_busyPeriods[$start]) {
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$this->_busyPeriods[$start] = $end;
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$this->_extraParams[$start] = $extra;
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}
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} else {
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// Add a new busy period.
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$this->_busyPeriods[$start] = $end;
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$this->_extraParams[$start] = $extra;
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}
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return true;
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}
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/**
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* Returns the timestamp of the start of the time period this free busy
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* information covers.
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*
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* @return integer A timestamp.
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*/
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function getStart()
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{
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if (!is_a($this->getAttribute('DTSTART'), 'PEAR_Error')) {
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return $this->getAttribute('DTSTART');
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} elseif (count($this->_busyPeriods)) {
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return min(array_keys($this->_busyPeriods));
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} else {
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return false;
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}
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}
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/**
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* Returns the timestamp of the end of the time period this free busy
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* information covers.
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*
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* @return integer A timestamp.
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*/
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function getEnd()
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{
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if (!is_a($this->getAttribute('DTEND'), 'PEAR_Error')) {
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return $this->getAttribute('DTEND');
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} elseif (count($this->_busyPeriods)) {
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return max(array_values($this->_busyPeriods));
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} else {
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return false;
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}
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}
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/**
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* Merges the busy periods of another Horde_iCalendar_vfreebusy object
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* into this one.
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*
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* This might lead to simplification no matter what you specify for the
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* "simplify" flag since periods with the same start date will lead to the
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* shorter period being removed (see addBusyPeriod).
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*
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* @param Horde_iCalendar_vfreebusy $freebusy A freebusy object.
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* @param boolean $simplify If true, simplify() will
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* called after the merge.
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*/
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function merge($freebusy, $simplify = true)
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{
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if (!is_a($freebusy, 'Horde_iCalendar_vfreebusy')) {
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return false;
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}
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$extra = $freebusy->getExtraParams();
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foreach ($freebusy->getBusyPeriods() as $start => $end) {
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// This might simplify the busy periods without taking the
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// "simplify" flag into account.
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$this->addBusyPeriod('BUSY', $start, $end, null,
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isset($extra[$start])
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? $extra[$start] : array());
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}
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$thisattr = $this->getAttribute('DTSTART');
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$thatattr = $freebusy->getAttribute('DTSTART');
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if (is_a($thisattr, 'PEAR_Error') && !is_a($thatattr, 'PEAR_Error')) {
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$this->setAttribute('DTSTART', $thatattr, array(), false);
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} elseif (!is_a($thatattr, 'PEAR_Error')) {
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if ($thatattr < $thisattr) {
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$this->setAttribute('DTSTART', $thatattr, array(), false);
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}
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}
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$thisattr = $this->getAttribute('DTEND');
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$thatattr = $freebusy->getAttribute('DTEND');
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if (is_a($thisattr, 'PEAR_Error') && !is_a($thatattr, 'PEAR_Error')) {
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$this->setAttribute('DTEND', $thatattr, array(), false);
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} elseif (!is_a($thatattr, 'PEAR_Error')) {
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if ($thatattr > $thisattr) {
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$this->setAttribute('DTEND', $thatattr, array(), false);
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}
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}
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if ($simplify) {
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$this->simplify();
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}
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return true;
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}
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/**
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* Removes all overlaps and simplifies the busy periods array as much as
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* possible.
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*/
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function simplify()
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{
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$clean = false;
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$busy = array($this->_busyPeriods, $this->_extraParams);
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while (!$clean) {
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$result = $this->_simplify($busy[0], $busy[1]);
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$clean = $result === $busy;
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$busy = $result;
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}
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ksort($result[1], SORT_NUMERIC);
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$this->_extraParams = $result[1];
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ksort($result[0], SORT_NUMERIC);
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$this->_busyPeriods = $result[0];
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}
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function _simplify($busyPeriods, $extraParams = array())
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{
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$checked = array();
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$checkedExtra = array();
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$checkedEmpty = true;
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foreach ($busyPeriods as $start => $end) {
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if ($checkedEmpty) {
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$checked[$start] = $end;
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$checkedExtra[$start] = isset($extraParams[$start])
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? $extraParams[$start] : array();
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$checkedEmpty = false;
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} else {
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$added = false;
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foreach ($checked as $testStart => $testEnd) {
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// Replace old period if the new period lies around the
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// old period.
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if ($start <= $testStart && $end >= $testEnd) {
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// Remove old period entry.
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unset($checked[$testStart]);
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unset($checkedExtra[$testStart]);
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// Add replacing entry.
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$checked[$start] = $end;
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$checkedExtra[$start] = isset($extraParams[$start])
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? $extraParams[$start] : array();
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$added = true;
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} elseif ($start >= $testStart && $end <= $testEnd) {
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// The new period lies fully within the old
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// period. Just forget about it.
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$added = true;
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} elseif (($end <= $testEnd && $end >= $testStart) ||
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($start >= $testStart && $start <= $testEnd)) {
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// Now we are in trouble: Overlapping time periods. If
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// we allow for additional parameters we cannot simply
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// choose one of the two parameter sets. It's better
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// to leave two separated time periods.
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$extra = isset($extraParams[$start])
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? $extraParams[$start] : array();
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$testExtra = isset($checkedExtra[$testStart])
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? $checkedExtra[$testStart] : array();
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// Remove old period entry.
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unset($checked[$testStart]);
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unset($checkedExtra[$testStart]);
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// We have two periods overlapping. Are their
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// additional parameters the same or different?
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$newStart = min($start, $testStart);
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$newEnd = max($end, $testEnd);
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if ($extra === $testExtra) {
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// Both periods have the same information. So we
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// can just merge.
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$checked[$newStart] = $newEnd;
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$checkedExtra[$newStart] = $extra;
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} else {
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// Extra parameters are different. Create one
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// period at the beginning with the params of the
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// first period and create a trailing period with
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// the params of the second period. The break
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// point will be the end of the first period.
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$break = min($end, $testEnd);
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$checked[$newStart] = $break;
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$checkedExtra[$newStart] =
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isset($extraParams[$newStart])
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? $extraParams[$newStart] : array();
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$checked[$break] = $newEnd;
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$highStart = max($start, $testStart);
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$checkedExtra[$break] =
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isset($extraParams[$highStart])
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? $extraParams[$highStart] : array();
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// Ensure we also have the extra data in the
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// extraParams.
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$extraParams[$break] =
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isset($extraParams[$highStart])
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? $extraParams[$highStart] : array();
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}
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$added = true;
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}
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if ($added) {
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break;
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}
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}
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if (!$added) {
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$checked[$start] = $end;
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$checkedExtra[$start] = isset($extraParams[$start])
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? $extraParams[$start] : array();
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}
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}
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}
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return array($checked, $checkedExtra);
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}
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}
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