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<?php
/**
* Static class to handle a slot-listening system.
*
* Unlike the slots/signals Qt model, this class manages something that is
* more like a simple hashtable, where each slot has only one value. For that
* reason "Registers" makes more sense, the reference being to CPU registers.
*
* This could be used for anything, but it's been built for a pretty specific phing
* need, and that is to allow access to dynamic values that are set by logic
* that is not represented in a build file. For exampe, we need a system for getting
* the current resource (file) that is being processed by a filterchain in a fileset.
*
* Each slot corresponds to only one read-only, dynamic-value RegisterSlot object. In
* a build.xml register slots are expressed using a syntax similar to variables:
*
* <replaceregexp>
* <regexp pattern="\n" replace="%{task.current_file}"/>
* </replaceregexp>
*
* The task/type must provide a supporting setter for the attribute:
*
* <code>
* function setListeningReplace(RegisterSlot $slot) {
* $this->replace = $slot;
* }
*
* // in main()
* if ($this->replace instanceof RegisterSlot) {
* $this->regexp->setReplace($this->replace->getValue());
* } else {
* $this->regexp->setReplace($this->replace);
* }
* </code>
*
* @author Hans Lellelid <hans@xmpl.org>
* @version $Id$
* @package phing.system.util
*/
class Register {
/** Slots that have been registered */
private static $slots = array();
/**
* Returns RegisterSlot for specified key.
*
* If not slot exists a new one is created for key.
*
* @param string $key
* @return RegisterSlot
*/
public static function getSlot($key) {
if (!isset(self::$slots[$key])) {
self::$slots[$key] = new RegisterSlot($key);
}
return self::$slots[$key];
}
}
/**
* Represents a slot in the register.
*
* @package phing.system.util
*/
class RegisterSlot {
/** The name of this slot. */
private $key;
/** The value for this slot. */
private $value;
/**
* Constructs a new RegisterSlot, setting the key to passed param.
* @param string $key
*/
public function __construct($key) {
$this->key = (string) $key;
}
/**
* Sets the key / name for this slot.
* @param string $k
*/
public function setKey($k) {
$this->key = (string) $k;
}
/**
* Gets the key / name for this slot.
* @return string
*/
public function getKey() {
return $this->key;
}
/**
* Sets the value for this slot.
* @param mixed
*/
public function setValue($v) {
$this->value = $v;
}
/**
* Returns the value at this slot.
* @return mixed
*/
public function getValue() {
return $this->value;
}
/**
* Recursively implodes an array to a comma-separated string
* @param array $arr
* @return string
*/
private function implodeArray(array $arr) {
$values = array();
foreach ($arr as $value) {
if (is_array($value)) {
$values[] = $this->implodeArray($value);
} else {
$values[] = $value;
}
}
return "{" . implode(",", $values) . "}";
}
/**
* Returns the value at this slot as a string value.
* @return string
*/
public function __toString()
{
if (is_array($this->value)) {
return $this->implodeArray($this->value);
} else {
return (string) $this->value;
}
}
}
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