<?php
/*
 * $Id: Target.php 175 2007-03-14 13:52:03Z hans $
 *
 * 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>.
 */

include_once 'phing/TaskContainer.php';

/**
 *  The Target component. Carries all required target data. Implements the
 *  abstract class {@link TaskContainer}
 *
 *  @author    Andreas Aderhold <andi@binarycloud.com>
 *  @copyright � 2001,2002 THYRELL. All rights reserved
 *  @version   $Revision: 1.10 $ $Date: 2007-03-14 14:52:03 +0100 (Wed, 14 Mar 2007) $
 *  @access    public
 *  @see       TaskContainer
 *  @package   phing
 */

class Target implements TaskContainer {
    
    /** name of target */
    private $name;
    
    /** dependencies */
    private $dependencies = array();
    
    /** holds objects of children of this target */
    private $children = array();
    
    /** the if cond. from xml */
    private $ifCondition = "";
    
    /** the unless cond. from xml */
    private $unlessCondition = "";
    
    /** description of this target */
    private $description;
    
    /** reference to project */
    private $project;

    /**
     *  References the project to the current component.
     *
     *  @param Project The reference to the current project
     */
    public function setProject(Project $project) {
        $this->project = $project;
    }

    /**
     *  Returns reference to current project
     *
     *  @return Project Reference to current porject object
     */
    public function getProject() {
        return $this->project;
    }

    /**
     *  Sets the target dependencies from xml
     *
     *  @param string $depends Comma separated list of targetnames that depend on
     *                  this target
     *  @throws BuildException
     */
    public function setDepends($depends) {
        // explode should be faster than strtok
        $deps = explode(',', $depends);
        for ($i=0, $size=count($deps); $i < $size; $i++) {
            $trimmed = trim($deps[$i]);
            if ($trimmed === "") {
                throw new BuildException("Syntax Error: Depend attribute for target ".$this->getName()." is malformed.");
            } 
            $this->addDependency($trimmed);
        }
    }

    /**
     *  Adds a singular dependent target name to the list
     *
     *  @param   string   The dependency target to add
     *  @access  public
     */
    public function addDependency($dependency) {
        $this->dependencies[] = (string) $dependency;
    }

    /**
     *  Returns reference to indexed array of the dependencies this target has.
     *
     *  @return  array  Referece to target dependencoes
     */
    public function getDependencies() {
        return $this->dependencies;
    }

    /**
     *  Sets the name of the target
     *
     *  @param  string   Name of this target
     */
    public function setName($name) {
        $this->name = (string) $name;
    }

    /**
     *  Returns name of this target.
     *
     *  @return  string     The name of the target
     *  @access   public
     */
    function getName() {
        return (string) $this->name;
    }

    /**
     *  Adds a task element to the list of this targets child elements
     *
     *  @param   object  The task object to add
     *  @access  public
     */
    function addTask(Task $task) {
        $this->children[] = $task;
    }

    /**
     *  Adds a runtime configurable element to the list of this targets child
     *  elements.
     *
     *  @param   object  The RuntimeConfigurabel object
     *  @access  public
     */
    function addDataType($rtc) {
        $this->children[] = $rtc;
    }

    /**
     *  Returns an array of all tasks this target has as childrens.
     *
     *  The task objects are copied here. Don't use this method to modify
     *  task objects.
     *
     *  @return  array  Task[]
     */
    public function getTasks() {
        $tasks = array();
        for ($i=0,$size=count($this->children); $i < $size; $i++) {
            $tsk = $this->children[$i];
            if ($tsk instanceof Task) {
                // note: we're copying objects here!
                $tasks[] = clone $tsk;
            }
        }
        return $tasks;
    }

    /**
     *  Set the if-condition from the XML tag, if any. The property name given
     *  as parameter must be present so the if condition evaluates to true
     *
     *  @param   string  The property name that has to be present
     *  @access  public
     */
    public function setIf($property) {
        $this->ifCondition = ($property === null) ? "" : $property;
    }

    /**
     *  Set the unless-condition from the XML tag, if any. The property name
     *  given as parameter must be present so the unless condition evaluates
     *  to true
     *
     *  @param   string  The property name that has to be present
     *  @access  public
     */
    public function setUnless($property) {
        $this->unlessCondition = ($property === null) ? "" : $property;
    }

    /**
     *  Sets a textual description of this target.
     *
     *  @param string The description text
     */
    public function setDescription($description) {
        if ($description !== null && strcmp($description, "") !== 0) {
            $this->description = (string) $description;
        } else {
            $this->description = null;
        }
    }

    /**
     *  Returns the description of this target.
     *
     *  @return string The description text of this target
     */
    public function getDescription() {
        return $this->description;
    }

    /**
     *  Returns a string representation of this target. In our case it
     *  simply returns the target name field
     *
     *  @return string The string representation of this target
     */
    function toString() {
        return (string) $this->name;
    }

    /**
     *  The entry point for this class. Does some checking, then processes and
     *  performs the tasks for this target.
     *
     */
    public function main() {
        if ($this->testIfCondition() && $this->testUnlessCondition()) {
            foreach($this->children as $o) {
                if ($o instanceof Task) {
                    // child is a task
                    $o->perform();
                } else {
                    // child is a RuntimeConfigurable
                    $o->maybeConfigure($this->project);
                }
            }
        } elseif (!$this->testIfCondition()) {
            $this->project->log("Skipped target '".$this->name."' because property '".$this->ifCondition."' not set.", Project::MSG_VERBOSE);
        } else {
            $this->project->log("Skipped target '".$this->name."' because property '".$this->unlessCondition."' set.", Project::MSG_VERBOSE);
        }
    }

    /**
     *  Performs the tasks by calling the main method of this target that
     *  actually executes the tasks.
     *
     *  This method is for ZE2 and used for proper exception handling of
     *  task exceptions.
     */
    public function performTasks() {
        try {// try to execute this target
            $this->project->fireTargetStarted($this);
            $this->main();
            $this->project->fireTargetFinished($this, $null=null);
        } catch (BuildException $exc) {
            // log here and rethrow
            $this->project->fireTargetFinished($this, $exc);
            throw $exc;
        }
    }    

    /**
     *  Tests if the property set in ifConfiditon exists.
     *
     *  @return  boolean  <code>true</code> if the property specified
     *                    in <code>$this->ifCondition</code> exists;
     *                    <code>false</code> otherwise
     */
    private function testIfCondition() {
        if ($this->ifCondition === "") {
            return true;
        }

        $properties = explode(",", $this->ifCondition);

        $result = true;
        foreach ($properties as $property) {
            $test = ProjectConfigurator::replaceProperties($this->getProject(), $property, $this->project->getProperties());
            $result = $result && ($this->project->getProperty($test) !== null);
        }

        return $result;
    }

    /**
     *  Tests if the property set in unlessCondition exists.
     *
     *  @return  boolean  <code>true</code> if the property specified
     *                    in <code>$this->unlessCondition</code> exists;
     *                    <code>false</code> otherwise
     */
    private function testUnlessCondition() {
        if ($this->unlessCondition === "") {
            return true;
        }
        
        $properties = explode(",", $this->unlessCondition);

        $result = true;
        foreach ($properties as $property) {
            $test = ProjectConfigurator::replaceProperties($this->getProject(), $property, $this->project->getProperties());
            $result = $result && ($this->project->getProperty($test) === null);
        }
        return $result;
    }

}
