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   1  <?php
   2  /*
   3   *  $Id: IsFalseCondition.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/ProjectComponent.php';
  23  require_once 'phing/tasks/system/condition/Condition.php';
  24  
  25  /**
  26   * Condition that tests whether a given string evals to false.
  27   * 
  28   * @author Hans Lellelid (Phing)
  29   * @author Steve Loughran (Ant)
  30   * @version $Revision: 1.4 $
  31   * @package phing.tasks.system.condition
  32   */
  33  class IsFalseCondition extends ProjectComponent implements Condition {
  34      
  35      /**  
  36       * what we eval
  37       */ 
  38      private $value;
  39  
  40      /**
  41       * Set the value to be tested.
  42       * @param boolean $value
  43       */ 
  44      public function setValue($value) {
  45          $this->value = $value;
  46      }
  47  
  48      /**
  49       * return the inverted value;
  50       * @throws BuildException if someone forgot to spec a value
  51       */ 
  52      public function evaluate() {
  53          if ($this->value === null) {
  54              throw new BuildException("Nothing to test for falsehood");
  55          }
  56          return !$this->value;
  57      }
  58  
  59  }
  60