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<?php

declare(strict_types=1);

namespace Laminas\Di\Resolver;

use Laminas\Di\Exception\LogicException;
use Psr\Container\ContainerInterface;

/**
 * Encapsulates the injection to perform for a parameter
 *
 * Implementations of this class will handle how the resolved dependency is provided and how (if possible) it can
 * be generated to PHP code for AoT compilation.
 *
 * For example the `TypeInjection`, that implements this interface, handles when the injection resolves to a specific
 * type. It will provide the injection with help of the di container. `ValueInjection` on the other hand handles
 * when a concrete value or instance should be injected.
 *
 * `DependencyResolverInterface::resolveParameters()` will provide an instance of this type for each injection.
 * `InjectorInterface` implementations will use these to obtain the actual injection value with `toValue()` while code
 * generators will use it to generate a factory.
 *
 * @internal
 *
 * @see DependencyResolverInterface::resolveParameters() The resolver method's return type
 * @see \Laminas\Di\Injector::getInjectionValue()        The default injector implementation
 * @see TypeInjection                                    Implementation for injecting an instance of a specific type
 * @see ValueInjection                                   Implementation for injecting an existing value
 */
interface InjectionInterface
{
    /**
     * Provides the actual value for injection, that will be passed to the constructor
     *
     * Implementations may utilize the provided ioc container to fulfill this purpose.
     *
     * @return mixed The resulting injection value
     */
    public function toValue(ContainerInterface $container);

    /**
     * Export the injection to PHP code
     *
     * This will be used by code generators to provide AoT factories
     *
     * @throws LogicException When the injection is not exportable.
     */
    public function export(): string;

    /**
     * Whether this injection can be exported as code or not
     *
     * Implementations may use this method to indicate if they may be exported to PHP code. This may not be possible
     * in some situations, for example when the injection is a `resource` that cannot be provided with a piece
     * of PHP code.
     *
     * When this method returns false, a call to `export()` should throw a
     * `Laminas\Di\Exception\LogicException`
     */
    public function isExportable(): bool;
}