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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Lesser General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
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To protect your rights, we need to make restrictions that forbid
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you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
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the term "modification".) Each licensee is addressed as "you".
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Whether that is true depends on what the Program does.
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and give any other recipients of the Program a copy of this License
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In addition, mere aggregation of another work not based on the Program
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integrity of the free software distribution system, which is
implemented by public license practices. Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
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This section is intended to make thoroughly clear what is believed to
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original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
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NO WARRANTY
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FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License.

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<?php
namespace Drupal\Component\ProxyBuilder;
/**
* Generates the string representation of the proxy service.
*/
class ProxyBuilder {
/**
* Generates the used proxy class name from a given class name.
*
* @param string $class_name
* The class name of the actual service.
*
* @return string
* The class name of the proxy.
*/
public static function buildProxyClassName($class_name) {
$match = [];
preg_match('/([a-zA-Z0-9_]+\\\\[a-zA-Z0-9_]+)\\\\(.+)/', $class_name, $match);
$root_namespace = $match[1];
$rest_fqcn = $match[2];
$proxy_class_name = $root_namespace . '\\ProxyClass\\' . $rest_fqcn;
return $proxy_class_name;
}
/**
* Generates the used proxy namespace from a given class name.
*
* @param string $class_name
* The class name of the actual service.
*
* @return string
* The namespace name of the proxy.
*/
public static function buildProxyNamespace($class_name) {
$proxy_classname = static::buildProxyClassName($class_name);
preg_match('/(.+)\\\\[a-zA-Z0-9]+/', $proxy_classname, $match);
$proxy_namespace = $match[1];
return $proxy_namespace;
}
/**
* Builds a proxy class string.
*
* @param string $class_name
* The class name of the actual service.
* @param string $proxy_class_name
* (optional) The class name of the proxy service.
*
* @return string
* The full string with namespace class and methods.
*/
public function build($class_name, $proxy_class_name = '') {
$reflection = new \ReflectionClass($class_name);
if ($proxy_class_name) {
$proxy_class_reflection = new \ReflectionClass($proxy_class_name);
$proxy_namespace = $proxy_class_reflection->getNamespaceName();
}
else {
$proxy_class_name = $this->buildProxyClassName($class_name);
$proxy_namespace = $this->buildProxyNamespace($class_name);
$proxy_class_shortname = str_replace($proxy_namespace . '\\', '', $proxy_class_name);
}
$output = '';
$class_documentation = <<<'EOS'
namespace {{ namespace }}{
/**
* Provides a proxy class for \{{ class_name }}.
*
* @see \Drupal\Component\ProxyBuilder
*/
EOS;
$class_start = ' class {{ proxy_class_shortname }}';
// For cases in which the implemented interface is a child of another
// interface, getInterfaceNames() also returns the parent. This causes a
// PHP error.
// In order to avoid that, check for each interface, whether one of its
// parents is also in the list and exclude it.
if ($interfaces = $reflection->getInterfaces()) {
foreach ($interfaces as $interface_name => $interface) {
// Exclude all parents from the list of implemented interfaces of the
// class.
if ($parent_interfaces = $interface->getInterfaceNames()) {
foreach ($parent_interfaces as $parent_interface) {
unset($interfaces[$parent_interface]);
}
}
}
$interface_names = [];
foreach ($interfaces as $interface) {
$interface_names[] = '\\' . $interface->getName();
}
$class_start .= ' implements ' . implode(', ', $interface_names);
}
$output .= $this->buildUseStatements();
// The actual class;
$properties = <<<'EOS'
/**
* The id of the original proxied service.
*
* @var string
*/
protected $drupalProxyOriginalServiceId;
/**
* The real proxied service, after it was lazy loaded.
*
* @var \{{ class_name }}
*/
protected $service;
/**
* The service container.
*
* @var \Symfony\Component\DependencyInjection\ContainerInterface
*/
protected $container;
EOS;
$output .= $properties;
// Add all the methods.
$methods = [];
$methods[] = $this->buildConstructorMethod();
$methods[] = $this->buildLazyLoadItselfMethod();
// Add all the methods of the proxied service.
$reflection_methods = $reflection->getMethods();
foreach ($reflection_methods as $method) {
if ($method->getName() === '__construct') {
continue;
}
if ($method->isPublic()) {
$methods[] = $this->buildMethod($method) . "\n";
}
}
$output .= implode("\n", $methods);
// Indent the output.
$output = implode("\n", array_map(function ($value) {
if ($value === '') {
return $value;
}
return " $value";
}, explode("\n", $output)));
$final_output = $class_documentation . $class_start . "\n {\n\n" . $output . "\n }\n\n}\n";
$final_output = str_replace('{{ class_name }}', $class_name, $final_output);
$final_output = str_replace('{{ namespace }}', $proxy_namespace ? $proxy_namespace . ' ' : '', $final_output);
$final_output = str_replace('{{ proxy_class_shortname }}', $proxy_class_shortname, $final_output);
return $final_output;
}
/**
* Generates the string for the method which loads the actual service.
*
* @return string
*/
protected function buildLazyLoadItselfMethod() {
$output = <<<'EOS'
/**
* Lazy loads the real service from the container.
*
* @return object
* Returns the constructed real service.
*/
protected function lazyLoadItself()
{
if (!isset($this->service)) {
$this->service = $this->container->get($this->drupalProxyOriginalServiceId);
}
return $this->service;
}
EOS;
return $output;
}
/**
* Generates the string representation of a single method: signature, body.
*
* @param \ReflectionMethod $reflection_method
* A reflection method for the method.
*
* @return string
*/
protected function buildMethod(\ReflectionMethod $reflection_method) {
$parameters = [];
foreach ($reflection_method->getParameters() as $parameter) {
$parameters[] = $this->buildParameter($parameter);
}
$function_name = $reflection_method->getName();
$reference = '';
if ($reflection_method->returnsReference()) {
$reference = '&';
}
$signature_line = <<<'EOS'
/**
* {@inheritdoc}
*/
EOS;
if ($reflection_method->isStatic()) {
$signature_line .= 'public static function ' . $reference . $function_name . '(';
}
else {
$signature_line .= 'public function ' . $reference . $function_name . '(';
}
$signature_line .= implode(', ', $parameters);
$signature_line .= ')';
$output = $signature_line . "\n{\n";
$output .= $this->buildMethodBody($reflection_method);
$output .= "\n" . '}';
return $output;
}
/**
* Builds a string for a single parameter of a method.
*
* @param \ReflectionParameter $parameter
* A reflection object of the parameter.
*
* @return string
*/
protected function buildParameter(\ReflectionParameter $parameter) {
$parameter_string = '';
if ($parameter->isArray()) {
$parameter_string .= 'array ';
}
elseif ($parameter->isCallable()) {
$parameter_string .= 'callable ';
}
elseif ($class = $parameter->getClass()) {
$parameter_string .= '\\' . $class->getName() . ' ';
}
if ($parameter->isPassedByReference()) {
$parameter_string .= '&';
}
$parameter_string .= '$' . $parameter->getName();
if ($parameter->isDefaultValueAvailable()) {
$parameter_string .= ' = ';
$parameter_string .= var_export($parameter->getDefaultValue(), TRUE);
}
return $parameter_string;
}
/**
* Builds the body of a wrapped method.
*
* @param \ReflectionMethod $reflection_method
* A reflection method for the method.
*
* @return string
*/
protected function buildMethodBody(\ReflectionMethod $reflection_method) {
$output = '';
$function_name = $reflection_method->getName();
if (!$reflection_method->isStatic()) {
$output .= ' return $this->lazyLoadItself()->' . $function_name . '(';
}
else {
$class_name = $reflection_method->getDeclaringClass()->getName();
$output .= " \\$class_name::$function_name(";
}
// Add parameters;
$parameters = [];
foreach ($reflection_method->getParameters() as $parameter) {
$parameters[] = '$' . $parameter->getName();
}
$output .= implode(', ', $parameters) . ');';
return $output;
}
/**
* Builds the constructor used to inject the actual service ID.
*
* @return string
*/
protected function buildConstructorMethod() {
$output = <<<'EOS'
/**
* Constructs a ProxyClass Drupal proxy object.
*
* @param \Symfony\Component\DependencyInjection\ContainerInterface $container
* The container.
* @param string $drupal_proxy_original_service_id
* The service ID of the original service.
*/
public function __construct(\Symfony\Component\DependencyInjection\ContainerInterface $container, $drupal_proxy_original_service_id)
{
$this->container = $container;
$this->drupalProxyOriginalServiceId = $drupal_proxy_original_service_id;
}
EOS;
return $output;
}
/**
* Build the required use statements of the proxy class.
*
* @return string
*/
protected function buildUseStatements() {
$output = '';
return $output;
}
}

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The Drupal Proxy Builder Component
Thanks for using this Drupal component.
You can participate in its development on Drupal.org, through our issue system:
https://www.drupal.org/project/issues/drupal
You can get the full Drupal repo here:
https://www.drupal.org/project/drupal/git-instructions
You can browse the full Drupal repo here:
http://cgit.drupalcode.org/drupal

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HOW-TO: Test this Drupal component
In order to test this component, you'll need to get the entire Drupal repo and
run the tests there.
You'll find the tests under core/tests/Drupal/Tests/Component.
You can get the full Drupal repo here:
https://www.drupal.org/project/drupal/git-instructions
You can find more information about running PHPUnit tests with Drupal here:
https://www.drupal.org/node/2116263
Each component in the Drupal\Component namespace has its own annotated test
group. You can use this group to run only the tests for this component. Like
this:
$ ./vendor/bin/phpunit -c core --group proxy_builder

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{
"name": "drupal/core-proxy-builder",
"description": "Provides a lightweight mechanism to provide lazy loaded proxies.",
"keywords": ["drupal", "proxy"],
"homepage": "https://www.drupal.org/project/drupal",
"license": "GPL-2.0+",
"require": {
"php": ">=5.5.9"
},
"autoload": {
"psr-4": {
"Drupal\\Component\\ProxyBuilder\\": ""
}
}
}