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Editing: ShapeMap.php

<?php
namespace Aws\Api;

/**
 * Builds shape based on shape references.
 */
class ShapeMap
{
    /** @var array */
    private $definitions;

/** @var Shape[] */
    private $simple;

/**
     * @param array $shapeModels Associative array of shape definitions.
     */
    public function __construct(array $shapeModels)
    {
        $this->definitions = $shapeModels;
    }

/**
     * Get an array of shape names.
     *
     * @return array
     */
    public function getShapeNames()
    {
        return array_keys($this->definitions);
    }

/**
     * Resolve a shape reference
     *
     * @param array $shapeRef Shape reference shape
     *
     * @return Shape
     * @throws \InvalidArgumentException
     */
    public function resolve(array $shapeRef)
    {
        $shape = $shapeRef['shape'];

if (!isset($this->definitions[$shape])) {
            throw new \InvalidArgumentException('Shape not found: ' . $shape);
        }

$isSimple = count($shapeRef) == 1;
        if ($isSimple && isset($this->simple[$shape])) {
            return $this->simple[$shape];
        }

$definition = $shapeRef + $this->definitions[$shape];
        $definition['name'] = $definition['shape'];
        if (isset($definition['shape'])) {
            unset($definition['shape']);
        }

$result = Shape::create($definition, $this);

if ($isSimple) {
            $this->simple[$shape] = $result;
        }

return $result;
    }
}

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