WebSVN – lars-tiefland.prado – /framework/Collections/TList.php

<?php
/**
 * TList, TListIterator classes
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2008 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @version $Id: TList.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Collections
 */

/**
 * TList class
 *
 * TList implements an integer-indexed collection class.
 *
 * You can access, append, insert, remove an item by using
 * {@link itemAt}, {@link add}, {@link insert}, {@link remove}, and {@link removeAt}.
 * To get the number of the items in the list, use {@link getCount}.
 * TList can also be used like a regular array as follows,
 * <code>
 * $list[]=$item;  // append at the end
 * $list[$index]=$item; // $index must be between 0 and $list->Count
 * unset($list[$index]); // remove the item at $index
 * if(isset($list[$index])) // if the list has an item at $index
 * foreach($list as $index=>$item) // traverse each item in the list
 * $n=count($list); // returns the number of items in the list
 * </code>
 *
 * To extend TList by doing additional operations with each addition or removal
 * operation, override {@link insertAt()}, and {@link removeAt()}.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id: TList.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Collections
 * @since 3.0
 */
class TList extends TComponent implements IteratorAggregate,ArrayAccess,Countable
{
        /**
         * internal data storage
         * @var array
         */
        private $_d=array();
        /**
         * number of items
         * @var integer
         */
        private $_c=0;
        /**
         * @var boolean whether this list is read-only
         */
        private $_r=false;

        /**
         * Constructor.
         * Initializes the list with an array or an iterable object.
         * @param array|Iterator the initial data. Default is null, meaning no initialization.
         * @param boolean whether the list is read-only
         * @throws TInvalidDataTypeException If data is not null and neither an array nor an iterator.
         */
        public function __construct($data=null,$readOnly=false)
        {
                if($data!==null)
                        $this->copyFrom($data);
                $this->setReadOnly($readOnly);
        }

        /**
         * @return boolean whether this list is read-only or not. Defaults to false.
         */
        public function getReadOnly()
        {
                return $this->_r;
        }

        /**
         * @param boolean whether this list is read-only or not
         */
        protected function setReadOnly($value)
        {
                $this->_r=TPropertyValue::ensureBoolean($value);
        }

        /**
         * Returns an iterator for traversing the items in the list.
         * This method is required by the interface IteratorAggregate.
         * @return Iterator an iterator for traversing the items in the list.
         */
        public function getIterator()
        {
                return new TListIterator($this->_d);
        }

        /**
         * Returns the number of items in the list.
         * This method is required by Countable interface.
         * @return integer number of items in the list.
         */
        public function count()
        {
                return $this->getCount();
        }

        /**
         * @return integer the number of items in the list
         */
        public function getCount()
        {
                return $this->_c;
        }

        /**
         * Returns the item at the specified offset.
         * This method is exactly the same as {@link offsetGet}.
         * @param integer the index of the item
         * @return mixed the item at the index
         * @throws TInvalidDataValueException if the index is out of the range
         */
        public function itemAt($index)
        {
                if($index>=0 && $index<$this->_c)
                        return $this->_d[$index];
                else
                        throw new TInvalidDataValueException('list_index_invalid',$index);
        }

        /**
         * Appends an item at the end of the list.
         * @param mixed new item
         * @return integer the zero-based index at which the item is added
         */
        public function add($item)
        {
                $this->insertAt($this->_c,$item);
                return $this->_c-1;
        }

        /**
         * Inserts an item at the specified position.
         * Original item at the position and the next items
         * will be moved one step towards the end.
         * @param integer the specified position.
         * @param mixed new item
         * @throws TInvalidDataValueException If the index specified exceeds the bound
         * @throws TInvalidOperationException if the list is read-only
         */
        public function insertAt($index,$item)
        {
                if(!$this->_r)
                {
                        if($index===$this->_c)
                                $this->_d[$this->_c++]=$item;
                        else if($index>=0 && $index<$this->_c)
                        {
                                array_splice($this->_d,$index,0,array($item));
                                $this->_c++;
                        }
                        else
                                throw new TInvalidDataValueException('list_index_invalid',$index);
                }
                else
                        throw new TInvalidOperationException('list_readonly',get_class($this));
        }

        /**
         * Removes an item from the list.
         * The list will first search for the item.
         * The first item found will be removed from the list.
         * @param mixed the item to be removed.
         * @return integer the index at which the item is being removed
         * @throws TInvalidDataValueException If the item does not exist
         */
        public function remove($item)
        {
                if(($index=$this->indexOf($item))>=0)
                {
                        $this->removeAt($index);
                        return $index;
                }
                else
                        throw new TInvalidDataValueException('list_item_inexistent');
        }

        /**
         * Removes an item at the specified position.
         * @param integer the index of the item to be removed.
         * @return mixed the removed item.
         * @throws TInvalidDataValueException If the index specified exceeds the bound
         * @throws TInvalidOperationException if the list is read-only
         */
        public function removeAt($index)
        {
                if(!$this->_r)
                {
                        if($index>=0 && $index<$this->_c)
                        {
                                $this->_c--;
                                if($index===$this->_c)
                                        return array_pop($this->_d);
                                else
                                {
                                        $item=$this->_d[$index];
                                        array_splice($this->_d,$index,1);
                                        return $item;
                                }
                        }
                        else
                                throw new TInvalidDataValueException('list_index_invalid',$index);
                }
                else
                        throw new TInvalidOperationException('list_readonly',get_class($this));
        }

        /**
         * Removes all items in the list.
         */
        public function clear()
        {
                for($i=$this->_c-1;$i>=0;--$i)
                        $this->removeAt($i);
        }

        /**
         * @param mixed the item
         * @return boolean whether the list contains the item
         */
        public function contains($item)
        {
                return $this->indexOf($item)>=0;
        }

        /**
         * @param mixed the item
         * @return integer the index of the item in the list (0 based), -1 if not found.
         */
        public function indexOf($item)
        {
                if(($index=array_search($item,$this->_d,true))===false)
                        return -1;
                else
                        return $index;
        }

        /**
         * @return array the list of items in array
         */
        public function toArray()
        {
                return $this->_d;
        }

        /**
         * Copies iterable data into the list.
         * Note, existing data in the list will be cleared first.
         * @param mixed the data to be copied from, must be an array or object implementing Traversable
         * @throws TInvalidDataTypeException If data is neither an array nor a Traversable.
         */
        public function copyFrom($data)
        {
                if(is_array($data) || ($data instanceof Traversable))
                {
                        if($this->_c>0)
                                $this->clear();
                        foreach($data as $item)
                                $this->add($item);
                }
                else if($data!==null)
                        throw new TInvalidDataTypeException('list_data_not_iterable');
        }

        /**
         * Merges iterable data into the map.
         * New data will be appended to the end of the existing data.
         * @param mixed the data to be merged with, must be an array or object implementing Traversable
         * @throws TInvalidDataTypeException If data is neither an array nor an iterator.
         */
        public function mergeWith($data)
        {
                if(is_array($data) || ($data instanceof Traversable))
                {
                        foreach($data as $item)
                                $this->add($item);
                }
                else if($data!==null)
                        throw new TInvalidDataTypeException('list_data_not_iterable');
        }

        /**
         * Returns whether there is an item at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to check on
         * @return boolean
         */
        public function offsetExists($offset)
        {
                return ($offset>=0 && $offset<$this->_c);
        }

        /**
         * Returns the item at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to retrieve item.
         * @return mixed the item at the offset
         * @throws TInvalidDataValueException if the offset is invalid
         */
        public function offsetGet($offset)
        {
                return $this->itemAt($offset);
        }

        /**
         * Sets the item at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to set item
         * @param mixed the item value
         */
        public function offsetSet($offset,$item)
        {
                if($offset===null || $offset===$this->_c)
                        $this->insertAt($this->_c,$item);
                else
                {
                        $this->removeAt($offset);
                        $this->insertAt($offset,$item);
                }
        }

        /**
         * Unsets the item at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to unset item
         */
        public function offsetUnset($offset)
        {
                $this->removeAt($offset);
        }
}


/**
 * TListIterator class
 *
 * TListIterator implements Iterator interface.
 *
 * TListIterator is used by TList. It allows TList to return a new iterator
 * for traversing the items in the list.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id: TList.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Collections
 * @since 3.0
 */
class TListIterator implements Iterator
{
        /**
         * @var array the data to be iterated through
         */
        private $_d;
        /**
         * @var integer index of the current item
         */
        private $_i;
        /**
         * @var integer count of the data items
         */
        private $_c;

        /**
         * Constructor.
         * @param array the data to be iterated through
         */
        public function __construct(&$data)
        {
                $this->_d=&$data;
                $this->_i=0;
                $this->_c=count($this->_d);
        }

        /**
         * Rewinds internal array pointer.
         * This method is required by the interface Iterator.
         */
        public function rewind()
        {
                $this->_i=0;
        }

        /**
         * Returns the key of the current array item.
         * This method is required by the interface Iterator.
         * @return integer the key of the current array item
         */
        public function key()
        {
                return $this->_i;
        }

        /**
         * Returns the current array item.
         * This method is required by the interface Iterator.
         * @return mixed the current array item
         */
        public function current()
        {
                return $this->_d[$this->_i];
        }

        /**
         * Moves the internal pointer to the next array item.
         * This method is required by the interface Iterator.
         */
        public function next()
        {
                $this->_i++;
        }

        /**
         * Returns whether there is an item at current position.
         * This method is required by the interface Iterator.
         * @return boolean
         */
        public function valid()
        {
                return $this->_i<$this->_c;
        }
}
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