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<?php
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/**
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information please see
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* <http://phing.info>.
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*/
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/**
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* Perform some tasks based on whether a given condition holds true or
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* not.
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*
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* <p>This task is heavily based on the Condition framework that can
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* be found in Ant 1.4 and later, therefore it cannot be used in
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* conjunction with versions of Ant prior to 1.4.</p>
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*
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* <p>This task doesn't have any attributes, the condition to test is
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* specified by a nested element - see the documentation of your
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* <code><condition></code> task (see
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* <a href="http://jakarta.apache.org/ant/manual/CoreTasks/condition.html">the
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* online documentation</a> for example) for a complete list of nested
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* elements.</p>
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*
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* <p>Just like the <code><condition></code> task, only a single
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* condition can be specified - you combine them using
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* <code><and></code> or <code><or></code> conditions.</p>
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*
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* <p>In addition to the condition, you can specify three different
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* child elements, <code><elseif></code>, <code><then></code> and
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* <code><else></code>. All three subelements are optional.
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*
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* Both <code><then></code> and <code><else></code> must not be
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* used more than once inside the if task. Both are
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* containers for Ant tasks, just like Ant's
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* <code><parallel></code> and <code><sequential></code>
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* tasks - in fact they are implemented using the same class as Ant's
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* <code><sequential></code> task.</p>
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*
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* The <code><elseif></code> behaves exactly like an <code><if></code>
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* except that it cannot contain the <code><else></code> element
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* inside of it. You may specify as may of these as you like, and the
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* order they are specified is the order they are evaluated in. If the
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* condition on the <code><if></code> is false, then the first
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* <code><elseif></code> who's conditional evaluates to true
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* will be executed. The <code><else></code> will be executed
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* only if the <code><if></code> and all <code><elseif></code>
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* conditions are false.
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*
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* <p>Use the following task to define the <code><if></code>
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* task before you use it the first time:</p>
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*
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* <pre><code>
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* <taskdef name="if" classname="net.sf.antcontrib.logic.IfTask" />
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* </code></pre>
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*
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* <h3>Crude Example</h3>
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*
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* <code>
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* <if>
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* <equals arg1="${foo}" arg2="bar" />
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* <then>
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* <echo message="The value of property foo is bar" />
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* </then>
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* <else>
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* <echo message="The value of property foo is not bar" />
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* </else>
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* </if>
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* </code>
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*
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* <code>
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* <if>
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* <equals arg1="${foo}" arg2="bar" />
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* <then>
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* <echo message="The value of property foo is 'bar'" />
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* </then>
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*
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* <elseif>
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* <equals arg1="${foo}" arg2="foo" />
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* <then>
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* <echo message="The value of property foo is 'foo'" />
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* </then>
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* </elseif>
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*
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* <else>
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* <echo message="The value of property foo is not 'foo' or 'bar'" />
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* </else>
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* </if>
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* </code>
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*
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* @author <a href="mailto:stefan.bodewig@freenet.de">Stefan Bodewig</a>
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* @package phing.tasks.system
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*/
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class IfTask extends ConditionBase
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{
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private $thenTasks = null;
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private $elseIfTasks = [];
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private $elseTasks = null;
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/***
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* A nested Else if task
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* @param ElseIfTask $ei
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*/
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public function addElseIf(ElseIfTask $ei)
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{
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$this->elseIfTasks[] = $ei;
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}
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/**
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* A nested <then> element - a container of tasks that will
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* be run if the condition holds true.
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*
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* <p>Not required.</p>
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*
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* @param SequentialTask $t
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* @throws BuildException
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*/
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public function addThen(SequentialTask $t)
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{
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if ($this->thenTasks != null) {
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throw new BuildException("You must not nest more than one <then> into <if>");
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}
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$this->thenTasks = $t;
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}
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/**
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* A nested <else> element - a container of tasks that will
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* be run if the condition doesn't hold true.
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*
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* <p>Not required.</p>
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*
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* @param SequentialTask $e
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* @throws BuildException
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*/
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public function addElse(SequentialTask $e)
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{
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if ($this->elseTasks != null) {
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throw new BuildException("You must not nest more than one <else> into <if>");
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}
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$this->elseTasks = $e;
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}
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public function main()
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{
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if ($this->countConditions() > 1) {
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throw new BuildException("You must not nest more than one condition into <if>");
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}
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if ($this->countConditions() < 1) {
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throw new BuildException("You must nest a condition into <if>");
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}
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$conditions = $this->getConditions();
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$c = $conditions[0];
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if ($c->evaluate()) {
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if ($this->thenTasks != null) {
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$this->thenTasks->main();
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}
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} else {
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$done = false;
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$sz = count($this->elseIfTasks);
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for ($i = 0; $i < $sz && !$done; $i++) {
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$ei = $this->elseIfTasks[$i];
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if ($ei->evaluate()) {
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$done = true;
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$ei->main();
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}
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}
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1
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if (!$done && $this->elseTasks != null) {
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$this->elseTasks->main();
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}
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}
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}
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}
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siad007