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<?php
/*
* $Id: UnknownElement.php,v 1.9 2005/11/08 20:45:59 hlellelid Exp $
*
* 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
* OWNER OR 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.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information please see
* <http://phing.info>.
*/
require_once 'phing/Task.php';
/**
* Wrapper class that holds all information necessary to create a task
* that did not exist when Phing started.
*
* <em> This has something to do with phing encountering an task XML element
* it is not aware of at start time. This is a situation where special steps
* need to be taken so that the element is then known.</em>
*
* @author Andreas Aderhold <andi@binarycloud.com>
* @author Hans Lellelid <hans@xmpl.org>
* @version $Revision: 1.9 $
* @package phing
*/
class UnknownElement extends Task {
private $elementName;
private $realThing;
private $children = array();
/**
* Constructs a UnknownElement object
*
* @param string The XML element name that is unknown
* @access public
*/
function __construct($elementName) {
$this->elementName = (string) $elementName;
}
/**
* Return the XML element name that this <code>UnnownElement</code>
* handles.
*
* @return string The XML element name that is unknown
*/
public function getTag() {
return (string) $this->elementName;
}
/**
* Tries to configure the unknown element
*
* @throws BuildException if the element can not be configured
*/
public function maybeConfigure() {
$this->realThing = $this->makeObject($this, $this->wrapper);
$this->wrapper->setProxy($this->realThing);
if ($this->realThing instanceof Task) {
$this->realThing->setRuntimeConfigurableWrapper($this->wrapper);
}
$this->handleChildren($this->realThing, $this->wrapper);
$this->wrapper->maybeConfigure($this->getProject());
}
/**
* Called when the real task has been configured for the first time.
*
* @throws BuildException if the task can not be created
*/
public function main() {
if ($this->realThing === null) {
// plain impossible to get here, maybeConfigure should
// have thrown an exception.
throw new BuildException("Should not be executing UnknownElement::main() -- task/type: {$this->elementName}");
}
if ($this->realThing instanceof Task) {
$this->realThing->main();
}
}
/**
* Add a child element to the unknown element
*
* @param object The object representing the child element
*/
public function addChild(UnknownElement $child) {
$this->children[] = $child;
}
/**
* Handle child elemets of the unknown element, if any.
*
* @param ProjectComponent The parent object the unkown element belongs to
* @param object The parent wrapper object
*/
function handleChildren(ProjectComponent $parent, $parentWrapper) {
if ($parent instanceof TaskAdapter) {
$parent = $parent->getProxy();
}
$parentClass = get_class($parent);
$ih = IntrospectionHelper::getHelper($parentClass);
for ($i=0, $childrenCount=count($this->children); $i < $childrenCount; $i++) {
$childWrapper = $parentWrapper->getChild($i);
$child = $this->children[$i];
$realChild = null;
if ($parent instanceof TaskContainer) {
$realChild = $this->makeTask($child, $childWrapper, false);
$parent->addTask($realChild);
} else {
$realChild = $ih->createElement($this->project, $parent, $child->getTag());
}
$childWrapper->setProxy($realChild);
if ($realChild instanceof Task) {
$realChild->setRuntimeConfigurableWrapper($childWrapper);
}
$child->handleChildren($realChild, $childWrapper);
if ($realChild instanceof Task) {
$realChild->maybeConfigure();
}
}
}
/**
* Creates a named task or data type. If the real object is a task,
* it is configured up to the init() stage.
*
* @param UnknownElement $ue The unknown element to create the real object for.
* Must not be <code>null</code>.
* @param RuntimeConfigurable $w Ignored in this implementation.
* @return object The Task or DataType represented by the given unknown element.
*/
protected function makeObject(UnknownElement $ue, RuntimeConfigurable $w) {
$o = $this->makeTask($ue, $w, true);
if ($o === null) {
$o = $this->project->createDataType($ue->getTag());
}
if ($o === null) {
throw new BuildException("Could not create task/type: '".$ue->getTag()."'. Make sure that this class has been declared using taskdef / typedef.");
}
return $o;
}
/**
* Create a named task and configure it up to the init() stage.
*
* @param UnknownElement $ue The unknwon element to create a task from
* @param RuntimeConfigurable $w The wrapper object
* @param boolean $onTopLevel Whether to treat this task as if it is top-level.
* @return Task The freshly created task
*/
protected function makeTask(UnknownElement $ue, RuntimeConfigurable $w, $onTopLevel = false) {
$task = $this->project->createTask($ue->getTag());
if ($task === null) {
if (!$onTopLevel) {
throw new BuildException("Could not create task of type: '".$this->elementName."'. Make sure that this class has been declared using taskdef.");
}
return null;
}
// used to set the location within the xmlfile so that exceptions can
// give detailed messages
$task->setLocation($this->getLocation());
$attrs = $w->getAttributes();
if (isset($attrs['id'])) {
$this->project->addReference($attrs['id'], $task);
}
// UnknownElement always has an associated target
$task->setOwningTarget($this->target);
$task->init();
return $task;
}
/**
* Get the name of the task to use in logging messages.
*
* @return string The task's name
*/
function getTaskName() {
return $this->realThing === null ? parent::getTaskName() : $this->realThing->getTaskName();
}
}
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