<?php
/*
 *  $Id: IsSetCondition.php 2004 2004-08-16 08:04:56Z chregu $
 *
 * 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';
require_once 'phing/tasks/system/condition/Condition.php';

/**
 * Condition that tests whether a given property has been set.
 *
 * @author Hans Lellelid <hans@xmpl.org> (Phing)
 * @author Stefan Bodewig <stefan.bodewig@epost.de> (Ant)
 * @version $Revision: 1.4 $
 * @package phing.tasks.system.condition
 */
class IsSetCondition extends ProjectComponent implements Condition {
    
    private $property;

    public function setProperty($p) {
        $this->property = $p;
    }

    /**
     * Check whether property is set.
     * @throws BuildException
     */
    public function evaluate()  {
        if ($this->property === null) {
            throw new BuildException("No property specified for isset "
                                     . "condition");
        }        
        return $this->project->getProperty($this->property) !== null;
    }

}
