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   1  <?php
   2  /*
   3   *  $Id: NotCondition.php 3076 2006-12-18 08:52:12Z fabien $
   4   *
   5   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   6   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   7   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   8   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   9   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  10   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  11   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  12   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  13   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  14   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  15   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  16   *
  17   * This software consists of voluntary contributions made by many individuals
  18   * and is licensed under the LGPL. For more information please see
  19   * <http://phing.info>.
  20   */
  21  
  22  require_once 'phing/tasks/system/condition/ConditionBase.php';
  23  
  24  /**
  25   *  <not> condition.
  26   *
  27   *  Evaluates to true if the single condition nested into it is false
  28   *  and vice versa.
  29   *
  30   *  @author    Andreas Aderhold <andi@binarycloud.com>
  31   *  @copyright © 2001,2002 THYRELL. All rights reserved
  32   *  @version   $Revision: 1.6 $ $Date: 2006-04-28 16:49:47 +0200 (Fri, 28 Apr 2006) $
  33   *  @access    public
  34   *  @package   phing.tasks.system.condition
  35   */
  36  class NotCondition extends ConditionBase implements Condition {
  37  
  38      function evaluate() {
  39          if ($this->countConditions() > 1) {
  40              throw new BuildException("You must not nest more than one condition into <not>");
  41          }
  42          if ($this->countConditions() < 1) {
  43              throw new BuildException("You must nest a condition into <not>");
  44          }
  45          $conds = $this->getIterator();
  46          return !$conds->current()->evaluate();
  47      }
  48  }