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<?php
/**
* Hoa
*
*
* @license
*
* New BSD License
*
* Copyright © 2007-2017, Hoa community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Hoa nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
namespace Psy\Readline\Hoa;
/**
* A contrario of events, listeners are synchronous, identified at use and
* useful for close interactions between one or some components.
*/
class EventListener
{
/**
* Source of listener (for `Hoa\Event\Bucket`).
*/
protected $_source = null;
/**
* All listener IDs and associated listeners.
*/
protected $_callables = [];
/**
* Build a listener.
*/
public function __construct(EventListenable $source, array $ids)
{
$this->_source = $source;
$this->addIds($ids);
return;
}
/**
* Adds acceptable ID (or reset).
*/
public function addIds(array $ids)
{
foreach ($ids as $id) {
$this->_callables[$id] = [];
}
}
/**
* Attaches a callable to a listenable component.
*/
public function attach(string $listenerId, $callable): self
{
if (false === $this->listenerExists($listenerId)) {
throw new EventException('Cannot listen %s because it is not defined.', 0, $listenerId);
}
$callable = Xcallable::from($callable);
$this->_callables[$listenerId][$callable->getHash()] = $callable;
return $this;
}
/**
* Detaches a callable from a listenable component.
*/
public function detach(string $listenerId, $callable): self
{
unset($this->_callables[$listenerId][Xcallable::from($callable)->getHash()]);
return $this;
}
/**
* Detaches all callables from a listenable component.
*/
public function detachAll(string $listenerId): self
{
unset($this->_callables[$listenerId]);
return $this;
}
/**
* Checks if a listener exists.
*/
public function listenerExists(string $listenerId): bool
{
return \array_key_exists($listenerId, $this->_callables);
}
/**
* Sends/fires a bucket to a listener.
*/
public function fire(string $listenerId, EventBucket $data): array
{
if (false === $this->listenerExists($listenerId)) {
throw new EventException('Cannot fire on %s because it is not defined.', 1, $listenerId);
}
$data->setSource($this->_source);
$out = [];
foreach ($this->_callables[$listenerId] as $callable) {
$out[] = $callable($data);
}
return $out;
}
}
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