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1 efrain 1 
<?php
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namespace Aws\Api;
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/**
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 * Base class that is used by most API shapes
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 */
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abstract class AbstractModel implements \ArrayAccess
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{
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    /** @var array */
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    protected $definition;
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    /** @var ShapeMap */
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    protected $shapeMap;
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    /** @var array */
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    protected $contextParam;
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    /**
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     * @param array    $definition Service description
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     * @param ShapeMap $shapeMap   Shapemap used for creating shapes
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     */
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    public function __construct(array $definition, ShapeMap $shapeMap)
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    {
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        $this->definition = $definition;
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        $this->shapeMap = $shapeMap;
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        if (isset($definition['contextParam'])) {
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            $this->contextParam = $definition['contextParam'];
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        }
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    }
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    public function toArray()
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    {
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        return $this->definition;
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    }
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    /**
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     * @return mixed|null
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     */
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    #[\ReturnTypeWillChange]
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    public function offsetGet($offset)
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    {
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        return isset($this->definition[$offset])
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            ? $this->definition[$offset] : null;
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    }
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    /**
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     * @return void
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     */
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    #[\ReturnTypeWillChange]
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    public function offsetSet($offset, $value)
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    {
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        $this->definition[$offset] = $value;
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    }
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    /**
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     * @return bool
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     */
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    #[\ReturnTypeWillChange]
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    public function offsetExists($offset)
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    {
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        return isset($this->definition[$offset]);
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    }
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    /**
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     * @return void
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     */
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    #[\ReturnTypeWillChange]
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    public function offsetUnset($offset)
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    {
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        unset($this->definition[$offset]);
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    }
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    protected function shapeAt($key)
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    {
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        if (!isset($this->definition[$key])) {
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            throw new \InvalidArgumentException('Expected shape definition at '
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                . $key);
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        }
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        return $this->shapeFor($this->definition[$key]);
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    }
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    protected function shapeFor(array $definition)
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    {
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        return isset($definition['shape'])
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            ? $this->shapeMap->resolve($definition)
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            : Shape::create($definition, $this->shapeMap);
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    }
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}