SimpleNode.php

<?php

/**
 * Hoa
 *
 *
 * @license
 *
 * New BSD License
 *
 * Copyright © 2007-2017, Hoa community. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Hoa nor the names of its contributors may be
 *       used to endorse or promote products derived from this software without
 *       specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

namespace Hoa\Graph;

/**
 * Class \Hoa\Graph\SimpleNode.
 *
 * A very simple node.
 *
 * @copyright  Copyright © 2007-2017 Hoa community
 * @license    New BSD License
 */
class SimpleNode implements Node
{
    /**
     * Node ID.
     *
     * @var string
     */
    protected $_id    = null;

    /**
     * Node value.
     *
     * @var string
     */
    protected $_value = null;



    /**
     * Build a node that contains a string.
     *
     * @param   string  $id       ID.
     * @param   string  $value    Value.
     */
    public function __construct($id, $value = null)
    {
        $this->setNodeId($id);
        $this->setNodeValue($value);

        return;
    }

    /**
     * Set node ID.
     *
     * @param   string  $id    Node ID.
     * @return  string
     */
    protected function setNodeId($id)
    {
        $old       = $this->_id;
        $this->_id = $id;

        return $old;
    }

    /**
     * Get node ID.
     *
     * @return  string
     */
    public function getNodeId()
    {
        return $this->_id;
    }

    /**
     * Set node value.
     *
     * @param   string  $value    Node value.
     * @return  string
     */
    public function setNodeValue($value = null)
    {
        $old          = $this->_value;
        $this->_value = $value;

        return $old;
    }

    /**
     * Get node value.
     *
     * @return  string
     */
    public function getNodeValue()
    {
        return $this->_value;
    }
}