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