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1 efrain 1 
<?php
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namespace Aws\Api;
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/**
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 * Represents a list shape.
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 */
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class ListShape extends Shape
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{
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    private $member;
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    public function __construct(array $definition, ShapeMap $shapeMap)
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    {
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        $definition['type'] = 'list';
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        parent::__construct($definition, $shapeMap);
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    }
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    /**
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     * @return Shape
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     * @throws \RuntimeException if no member is specified
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     */
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    public function getMember()
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    {
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        if (!$this->member) {
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            if (!isset($this->definition['member'])) {
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                throw new \RuntimeException('No member attribute specified');
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            }
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            $this->member = Shape::create(
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                $this->definition['member'],
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                $this->shapeMap
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            );
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        }
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        return $this->member;
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    }
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}