kronostechnologies/graphql-framework

<?php


namespace Kronos\GraphQLFramework\Utils\Reflection;


use Kronos\GraphQLFramework\Utils\Reflection\Exception\NoClassMethodFoundException;
use ReflectionClass;
use ReflectionMethod;

class ClassMethodsReader
{
    /**
     * @var string
     */
    protected $classFQN;

    /**
     * @var array
     */
    protected $knownMethods;

    /**
     * @param string $classFQN
     */
    public function __construct($classFQN)
    {
        $this->classFQN = $classFQN;
    }

    /**
     * Returns an array of 'lowercasemethod' => 'lowercaseMethod' which corresponds to '(LowercasedMethodName)' => '(ActualMethodName)'.
     * Only public methods are returned.
     *
     * @return string[]
     * @throws \ReflectionException
     */
    public function getLowercaseMethodsAssociations()
    {
        if ($this->knownMethods === null) {
            $reflectionClass = new ReflectionClass($this->classFQN);
            $methods = $reflectionClass->getMethods(ReflectionMethod::IS_PUBLIC);

            $this->knownMethods = [];
            foreach ($methods as $method) {
                $this->knownMethods[strtolower($method->getName())] = $method->getName();
            }
        }

        return $this->knownMethods;
    }

    /**
     * @param string $soughtName
     * @return string
     * @throws \ReflectionException
     * @throws NoClassMethodFoundException
     */
    public function getMethodForName($soughtName)
    {
        $lowercaseSoughtName = strtolower($soughtName);

        $knownMethods = $this->getLowercaseMethodsAssociations();

        foreach ($knownMethods as $lowercasedKnownMethod => $knownMethod) {
            if ($lowercasedKnownMethod === $lowercaseSoughtName) {
                return $knownMethod;
            }
        }

        throw new NoClassMethodFoundException($soughtName, $this->classFQN);
    }
}