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