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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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 * This selector has one other selectors whose meaning it inverts. It
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 * actually relies on NoneSelector for its implementation of the
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 * isSelected() method, but it adds a check to ensure there is only one
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 * other selector contained within.
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 *
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 * @author  Hans Lellelid <hans@xmpl.org> (Phing)
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 * @author  Bruce Atherton <bruce@callenish.com> (Ant)
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 * @package phing.types.selectors
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 */
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class NotSelector extends NoneSelector
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{
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    /**
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     * @return string
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     */
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    public function __toString()
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    {
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        $buf = "";
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        if ($this->hasSelectors()) {
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            $buf .= "{notselect: ";
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            $buf .= parent::__toString();
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            $buf .= "}";
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        }
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        return $buf;
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    }
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    /**
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     * Makes sure that there is only one entry, sets an error message if
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     * not.
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     */
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    public function verifySettings()
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    {
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        if ($this->count() !== 1) {
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            $this->setError(
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                "One and only one selector is allowed within the " .
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                "<not> tag"
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            );
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        }
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    }
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}

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