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<?php
/*
* $Id: DataType.php,v 1.9 2005/11/02 13:55:34 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/ProjectComponent.php';
include_once 'phing/BuildException.php';
/**
* Base class for those classes that can appear inside the build file
* as stand alone data types.
*
* This class handles the common description attribute and provides
* a default implementation for reference handling and checking for
* circular references that is appropriate for types that can not be
* nested inside elements of the same type (i.e. patternset but not path)
*
* @package phing.types
*/
class DataType extends ProjectComponent {
/** The descriptin the user has set. */
public $description = null;
/** Value to the refid attribute. Type of Reference*/
public $ref = null;
/**
* Are we sure we don't hold circular references?
*
* Subclasses are responsible for setting this value to false
* if we'd need to investigate this condition (usually because a
* child element has been added that is a subclass of DataType).
* @var boolean
*/
protected $checked = true;
/**
* Sets a description of the current data type. It will be useful
* in commenting what we are doing.
*/
function setDescription($desc) {
$this->description = (string) $desc;
}
/** Return the description for the current data type. */
function getDescription() {
return $this->description;
}
/** Has the refid attribute of this element been set? */
function isReference() {
return ($this->ref !== null);
}
/**
* Set the value of the refid attribute.
*
* Subclasses may need to check whether any other attributes
* have been set as well or child elements have been created and
* thus override this method. if they do they must call parent::setRefid()
*
* @param Reference $r
* @return void
*/
function setRefid(Reference $r) {
$this->ref = $r;
$this->checked = false;
}
/**
* Check to see whether any DataType we hold references to is
* included in the Stack (which holds all DataType instances that
* directly or indirectly reference this instance, including this
* instance itself).
*
* If one is included, throw a BuildException created by circularReference
*
* This implementation is appropriate only for a DataType that
* cannot hold other DataTypes as children.
*
* The general contract of this method is that it shouldn't do
* anything if checked is true and set it to true on exit.
*/
function dieOnCircularReference(&$stk, Project $p) {
if ($this->checked || !$this->isReference()) {
return;
}
$o = $this->ref->getReferencedObject($p);
if ($o instanceof DataType) {
// TESTME - make sure that in_array() works just as well here
//
// check if reference is in stack
//$contains = false;
//for ($i=0, $size=count($stk); $i < $size; $i++) {
// if ($stk[$i] === $o) {
// $contains = true;
// break;
// }
//}
if (in_array($o, $stk, true)) {
// throw build exception
throw $this->circularReference();
} else {
array_push($stk, $o);
$o->dieOnCircularReference($stk, $p);
array_pop($stk);
}
}
$this->checked = true;
}
/** Performs the check for circular references and returns the referenced object. */
function getCheckedRef($requiredClass, $dataTypeName) {
if (!$this->checked) {
// should be in stack
$stk = array();
$stk[] = $this;
$this->dieOnCircularReference($stk, $this->getProject());
}
$o = $this->ref->getReferencedObject($this->getProject());
if (!($o instanceof $requiredClass) ) {
throw new BuildException($this->ref->getRefId()." doesn't denote a " . $dataTypeName);
} else {
return $o;
}
}
/**
* Creates an exception that indicates that refid has to be the
* only attribute if it is set.
*/
function tooManyAttributes() {
return new BuildException( "You must not specify more than one attribute when using refid" );
}
/**
* Creates an exception that indicates that this XML element must
* not have child elements if the refid attribute is set.
*/
function noChildrenAllowed() {
return new BuildException("You must not specify nested elements when using refid");
}
/**
* Creates an exception that indicates the user has generated a
* loop of data types referencing each other.
*/
function circularReference() {
return new BuildException("This data type contains a circular reference.");
}
/**
* Template method being called when the data type has been
* parsed completely.
* @return void
*/
function parsingComplete() {}
}
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