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diff --git a/buildscripts/phing/classes/phing/system/util/Register.php b/buildscripts/phing/classes/phing/system/util/Register.php
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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;
+        }
+    }
+    
+}
+