<?php

declare(strict_types=1);

namespace PHPJava\Kernel\Structures\Annotations;

use PHPJava\Exceptions\RuntimeException;

final class ElementValue implements AnnotationInterface

{

use \PHPJava\Kernel\Core\BinaryReader;

use \PHPJava\Kernel\Core\ConstantPool;

use \PHPJava\Kernel\Core\DebugTool;

/**

* @var string

*/

private $tag;

/**

* @var int|int[]|(int|static[])[]|Annotation

*/

private $value;

/**

* @throws RuntimeException

* @see https://docs.oracle.com/javase/specs/jvms/se11/html/jvms-4.html#jvms-4.7.16

*/

public function execute(): void

{

$this->tag = chr($this->readByte());

switch ($this->tag) {

case 'B': // const_value_index

case 'C':

case 'D':

case 'F':

case 'I':

case 'J':

case 'S':

case 'Z':

case 's':

$this->value = $this->readUnsignedShort();

break;

case 'e': // enum_const_value

$this->value = [

'type_name_index' => $this->readUnsignedShort(),

'const_name_index' => $this->readUnsignedShort(),

];

break;

case 'c': // class_info_index

$this->value = $this->readUnsignedShort();

break;

case '@': // annotation_value

$this->value = new Annotation($this->reader);

$this->value->setConstantPool($this->getConstantPool());

$this->value->setDebugTool($this->getDebugTool());

$this->value->execute();

break;

case '[': // array_value

$this->value = [

'num_values' => $this->readUnsignedShort(),

'values' => [],

];

for ($i = 0; $i < $this->value['num_values']; $i++) {

$value = new static($this->reader);

$value->setConstantPool($this->getConstantPool());

$value->setDebugTool($this->getDebugTool());

$value->execute();

$this->value['values'][] = $value;

}

break;

default:

throw new RuntimeException('Invalid tag "' . $this->tag . '" in element_value structure.');

}

}

public function getValue()

{

return $this->value;

}

}