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<?php
/**
* PHPPowerPoint
*
* Copyright (c) 2009 - 2010 PHPPowerPoint
*
* 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 PHPPowerPoint
* @package PHPPowerPoint
* @copyright Copyright (c) 2009 - 2010 PHPPowerPoint (http://www.codeplex.com/PHPPowerPoint)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 0.1.0, 2009-04-27
*/
/** PHPPowerPoint_IComparable */
require_once 'PHPPowerPoint/IComparable.php';
/**
* PHPPowerPoint_HashTable
*
* @category PHPPowerPoint
* @package PHPPowerPoint
* @copyright Copyright (c) 2009 - 2010 PHPPowerPoint (http://www.codeplex.com/PHPPowerPoint)
*/
class PHPPowerPoint_HashTable
{
/**
* HashTable elements
*
* @var array
*/
public $_items = array();
/**
* HashTable key map
*
* @var array
*/
public $_keyMap = array();
/**
* Create a new PHPPowerPoint_HashTable
*
* @param PHPPowerPoint_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 PHPPowerPoint_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 PHPPowerPoint_IComparable $pSource Item to add
* @throws Exception
*/
public function add(PHPPowerPoint_IComparable $pSource = null) {
// Determine hashcode
$hashCode = null;
$hashIndex = $pSource->getHashIndex();
if ( is_null ( $hashIndex ) ) {
$hashCode = $pSource->getHashCode();
} else if ( isset ( $this->_keyMap[$hashIndex] ) ) {
$hashCode = $this->_keyMap[$hashIndex];
} else {
$hashCode = $pSource->getHashCode();
}
// Add value
if (!isset($this->_items[ $hashCode ])) {
$this->_items[ $hashCode ] = $pSource;
$index = count($this->_items) - 1;
$this->_keyMap[ $index ] = $hashCode;
$pSource->setHashIndex( $index );
} else {
$pSource->setHashIndex( $this->_items[ $hashCode ]->getHashIndex() );
}
}
/**
* Remove HashTable item
*
* @param PHPPowerPoint_IComparable $pSource Item to remove
* @throws Exception
*/
public function remove(PHPPowerPoint_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 $pIndex
* @return PHPPowerPoint_IComparable
*
*/
public function getByIndex($pIndex = 0) {
if (isset($this->_keyMap[$pIndex])) {
return $this->getByHashCode( $this->_keyMap[$pIndex] );
}
return null;
}
/**
* Get by hashcode
*
* @param string $pHashCode
* @return PHPPowerPoint_IComparable
*
*/
public function getByHashCode($pHashCode = '') {
if (isset($this->_items[$pHashCode])) {
return $this->_items[$pHashCode];
}
return null;
}
/**
* HashTable to array
*
* @return PHPPowerPoint_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;
}
}
}
}
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