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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 structure shape and resolve member shape references.
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 */
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class StructureShape extends Shape
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{
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    /**
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     * @var Shape[]
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     */
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    private $members;
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    public function __construct(array $definition, ShapeMap $shapeMap)
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    {
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        $definition['type'] = 'structure';
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        if (!isset($definition['members'])) {
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            $definition['members'] = [];
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        }
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        parent::__construct($definition, $shapeMap);
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    }
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    /**
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     * Gets a list of all members
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     *
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     * @return Shape[]
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     */
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    public function getMembers()
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    {
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        if (empty($this->members)) {
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            $this->generateMembersHash();
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        }
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        return $this->members;
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    }
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    /**
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     * Check if a specific member exists by name.
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     *
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     * @param string $name Name of the member to check
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     *
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     * @return bool
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     */
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    public function hasMember($name)
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    {
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        return isset($this->definition['members'][$name]);
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    }
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    /**
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     * Retrieve a member by name.
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     *
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     * @param string $name Name of the member to retrieve
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     *
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     * @return Shape
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     * @throws \InvalidArgumentException if the member is not found.
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     */
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    public function getMember($name)
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    {
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        $members = $this->getMembers();
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        if (!isset($members[$name])) {
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            throw new \InvalidArgumentException('Unknown member ' . $name);
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        }
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        return $members[$name];
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    }
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    private function generateMembersHash()
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    {
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        $this->members = [];
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        foreach ($this->definition['members'] as $name => $definition) {
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            $this->members[$name] = $this->shapeFor($definition);
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        }
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    }
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}