<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Config\Definition;

use Symfony\Component\Config\Definition\Exception\ForbiddenOverwriteException;
use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
use Symfony\Component\Config\Definition\Exception\InvalidTypeException;

/**
* Common Interface among all nodes.
*
* In most cases, it is better to inherit from BaseNode instead of implementing
* this interface yourself.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
*/
interface NodeInterface
{
/**
* Returns the name of the node.
*
* @return string The name of the node
*/
public function getName();

/**
* Returns the path of the node.
*
* @return string The node path
*/
public function getPath();

/**
* Returns true when the node is required.
*
* @return bool If the node is required
*/
public function isRequired();

/**
* Returns true when the node has a default value.
*
* @return bool If the node has a default value
*/
public function hasDefaultValue();

/**
* Returns the default value of the node.
*
* @return mixed The default value
*
* @throws \RuntimeException if the node has no default value
*/
public function getDefaultValue();

/**
* Normalizes a value.
*
* @param mixed $value The value to normalize
*
* @return mixed The normalized value
*
* @throws InvalidTypeException if the value type is invalid
*/
public function normalize($value);

/**
* Merges two values together.
*
* @param mixed $leftSide
* @param mixed $rightSide
*
* @return mixed The merged value
*
* @throws ForbiddenOverwriteException if the configuration path cannot be overwritten
* @throws InvalidTypeException if the value type is invalid
*/
public function merge($leftSide, $rightSide);

/**
* Finalizes a value.
*
* @param mixed $value The value to finalize
*
* @return mixed The finalized value
*
* @throws InvalidTypeException if the value type is invalid
* @throws InvalidConfigurationException if the value is invalid configuration
*/
public function finalize($value);
}