Introducing HasDefaultOptions Interface

[sandrokeil]

The configuration described in #8 Introducing HasOptionalOptions Interface has default options.

So why not have an interface which returns the options with default values?

namespace Interop\Config;

interface HasDefaultOptions
{
    /**
     * Returns a list of default options with their values
     *
     * @return string[] List of default options with their values
     */
    public function defaultOptions();
}

Implementation for the configuration looks like

public function defaultOptions()
{
    return [
        'metadata_cache' => 'array',
        'query_cache' => 'array',
        'result_cache' => 'array',
        'hydration_cache' => 'array',
    ];
}

This does not replace the HasOptionalOptions interface, because optional means null (not provided). I think the interface HasOptionalOptions and HasDefaultOptions can be combined.

For this feature the ConfigurationTrait must be updated with an extra interface check. What do you think?

[prolic]

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[codeliner]

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