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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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 * A <code>ContainerMapper</code> that chains the results of the first
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 * nested <code>FileNameMapper</code>s into sourcefiles for the second,
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 * the second to the third, and so on, returning the resulting mapped
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 * filenames from the last nested <code>FileNameMapper</code>.
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 */
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class ChainedMapper extends ContainerMapper
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{
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    /**
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     * {@inheritDoc}.
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     */
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    public function main($sourceFileName)
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    {
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        $results[] = $sourceFileName;
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        $mapper = null;
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        foreach ($this->getMappers() as $mapper) {
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            if ($mapper !== null) {
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                $inputs = $results;
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                $results = [];
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                foreach ($inputs as $input) {
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                    $mapped = $mapper->getImplementation()->main($input);
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                    if ($mapped != null) {
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                        $results = $mapped;
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                    }
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                }
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            }
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        }
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        return !empty($results) ? $results : null;
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    }
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}

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