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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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 * Condition that tests whether a given string evals to true.
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 *
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 * @author  Hans Lellelid <hans@xmpl.org> (Phing)
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 * @author  Steve Loughran (Ant)
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 * @package phing.tasks.system.condition
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 */
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class IsTrueCondition extends ProjectComponent implements Condition
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{
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    /**
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     * what we eval
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     */
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    private $value;
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    /**
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     * Set the value to be tested.
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     *
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     * @param mixed $value
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     */
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    public function setValue($value)
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    {
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        $this->value = (bool) $value;
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    }
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    /**
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     * return the inverted value;
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     *
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     * @throws BuildException if someone forgot to spec a value
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     */
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    public function evaluate()
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    {
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        if ($this->value === null) {
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            throw new BuildException("Nothing to test for falsehood");
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        }
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        return $this->value;
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    }
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}

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