/branches/v1.6.1/Classes/PHPExcel/HashTable.php

<?php

/**

 * PHPExcel

 *

 * Copyright (c) 2006 - 2008 PHPExcel

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 * 

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 * 

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 * @category   PHPExcel

 * @package    PHPExcel

 * @copyright  Copyright (c) 2006 - 2008 PHPExcel (http://www.codeplex.com/PHPExcel)

 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL

 * @version    ##VERSION##, ##DATE##

 */





/** PHPExcel_IComparable */

require_once 'PHPExcel/IComparable.php';





/**

 * PHPExcel_HashTable

 *

 * @category   PHPExcel

 * @package    PHPExcel

 * @copyright  Copyright (c) 2006 - 2008 PHPExcel (http://www.codeplex.com/PHPExcel)

 */

class PHPExcel_HashTable

{

    /**

     * HashTable elements

     *

     * @var array

     */

    public $_items = array();

    

    /**

     * HashTable key map

     *

     * @var array

     */

    public $_keyMap = array();

	

    /**

     * Create a new PHPExcel_HashTable

     *

     * @param 	PHPExcel_IComparable[] $pSource	Optional source array to create HashTable from

     * @throws 	Exception

     */

    public function __construct($pSource = null)

    {

    	if (!is_null($pSource)) {

	        // Create HashTable

	        $this->addFromSource($pSource);

    	}

    }

    

    /**

     * Add HashTable items from source

     *

     * @param 	PHPExcel_IComparable[] $pSource	Source array to create HashTable from

     * @throws 	Exception

     */

    public function addFromSource($pSource = null) {

    	// Check if an array was passed

        if ($pSource == null) {

            return;

        } else if (!is_array($pSource)) {

            throw new Exception('Invalid array parameter passed.');

        }

        

        foreach ($pSource as $item) {

            $this->add($item);

        }

    }



    /**

     * Add HashTable item

     *

     * @param 	PHPExcel_IComparable $pSource	Item to add

     * @throws 	Exception

     */

    public function add(PHPExcel_IComparable $pSource = null) {

   		if (!isset($this->_items[  $pSource->getHashCode()  ])) {

            $this->_items[  $pSource->getHashCode()  ] = $pSource;

            $this->_keyMap[  count($this->_items) - 1  ] = $pSource->getHashCode();

   		}

    }

    

    /**

     * Remove HashTable item

     *

     * @param 	PHPExcel_IComparable $pSource	Item to remove

     * @throws 	Exception

     */

    public function remove(PHPExcel_IComparable $pSource = null) {

    	if (isset($this->_items[  $pSource->getHashCode()  ])) {

	   		unset($this->_items[  $pSource->getHashCode()  ]);

	    		

	   		$deleteKey = -1;

	   		foreach ($this->_keyMap as $key => $value) {    			

	   			if ($deleteKey >= 0) {

	   				$this->_keyMap[$key - 1] = $value;

	   			}

	    			

	   			if ($value == $pSource->getHashCode()) {

	   				$deleteKey = $key;

	   			}

	   		}

	   		unset($this->_keyMap[ count($this->_keyMap) - 1 ]);   

    	}         

    }

    

    /**

     * Clear HashTable

     *

     */

    public function clear() {

    	$this->_items = array();

    	$this->_keyMap = array();

    }

    

    /**

     * Count

     *

     * @return int

     */

    public function count() {

    	return count($this->_items);

    }

    

    /**

     * Get index for hash code

     *

     * @param 	string 	$pHashCode

     * @return 	int 	Index

     */

    public function getIndexForHashCode($pHashCode = '') {

    	return array_search($pHashCode, $this->_keyMap);

    }

    

    /**

     * Get by index

     *

     * @param	int	$pIndex

     * @return 	PHPExcel_IComparable

     *

     */

    public function getByIndex($pIndex = 0) {

    	if (isset($this->_keyMap[$pIndex])) {

    		return $this->getByHashCode( $this->_keyMap[$pIndex] );

    	}

    	

    	return null;

    }

    

    /**

     * Get by hashcode

     *

     * @param	string	$pHashCode

     * @return 	PHPExcel_IComparable

     *

     */

    public function getByHashCode($pHashCode = '') {

    	if (isset($this->_items[$pHashCode])) {

    		return $this->_items[$pHashCode];

    	}

    	

    	return null;

    }

    

    /**

     * HashTable to array

     *

     * @return PHPExcel_IComparable[]

     */

    public function toArray() {

    	return $this->_items;

    }

        

	/**

	 * Implement PHP __clone to create a deep clone, not just a shallow copy.

	 */

	public function __clone() {

		$vars = get_object_vars($this);

		foreach ($vars as $key => $value) {

			if (is_object($value)) {

				$this->$key = clone $value;

			}

		}

	}

}