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

<?php
/**
 * TMap, TMapIterator 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: TMap.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Collections
 */

/**
 * TMap class
 *
 * TMap implements a collection that takes key-value pairs.
 *
 * You can access, add or remove an item with a key by using
 * {@link itemAt}, {@link add}, and {@link remove}.
 * To get the number of the items in the map, use {@link getCount}.
 * TMap can also be used like a regular array as follows,
 * <code>
 * $map[$key]=$value; // add a key-value pair
 * unset($map[$key]); // remove the value with the specified key
 * if(isset($map[$key])) // if the map contains the key
 * foreach($map as $key=>$value) // traverse the items in the map
 * $n=count($map);  // returns the number of items in the map
 * </code>
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id: TMap.php 2541 2008-10-21 15:05:13Z qiang.xue $
 * @package System.Collections
 * @since 3.0
 */
class TMap extends TComponent implements IteratorAggregate,ArrayAccess,Countable
{
        /**
         * @var array internal data storage
         */
        private $_d=array();
        /**
         * @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 intial 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 map 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 TMapIterator($this->_d);
        }

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

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

        /**
         * @return array the key list
         */
        public function getKeys()
        {
                return array_keys($this->_d);
        }

        /**
         * Returns the item with the specified key.
         * This method is exactly the same as {@link offsetGet}.
         * @param mixed the key
         * @return mixed the element at the offset, null if no element is found at the offset
         */
        public function itemAt($key)
        {
                return isset($this->_d[$key]) ? $this->_d[$key] : null;
        }

        /**
         * Adds an item into the map.
         * Note, if the specified key already exists, the old value will be overwritten.
         * @param mixed key
         * @param mixed value
         * @throws TInvalidOperationException if the map is read-only
         */
        public function add($key,$value)
        {
                if(!$this->_r)
                        $this->_d[$key]=$value;
                else
                        throw new TInvalidOperationException('map_readonly',get_class($this));
        }

        /**
         * Removes an item from the map by its key.
         * @param mixed the key of the item to be removed
         * @return mixed the removed value, null if no such key exists.
         * @throws TInvalidOperationException if the map is read-only
         */
        public function remove($key)
        {
                if(!$this->_r)
                {
                        if(isset($this->_d[$key]) || array_key_exists($key,$this->_d))
                        {
                                $value=$this->_d[$key];
                                unset($this->_d[$key]);
                                return $value;
                        }
                        else
                                return null;
                }
                else
                        throw new TInvalidOperationException('map_readonly',get_class($this));
        }

        /**
         * Removes all items in the map.
         */
        public function clear()
        {
                foreach(array_keys($this->_d) as $key)
                        $this->remove($key);
        }

        /**
         * @param mixed the key
         * @return boolean whether the map contains an item with the specified key
         */
        public function contains($key)
        {
                return isset($this->_d[$key]) || array_key_exists($key,$this->_d);
        }

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

        /**
         * Copies iterable data into the map.
         * Note, existing data in the map 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 an iterator.
         */
        public function copyFrom($data)
        {
                if(is_array($data) || $data instanceof Traversable)
                {
                        if($this->getCount()>0)
                                $this->clear();
                        foreach($data as $key=>$value)
                                $this->add($key,$value);
                }
                else if($data!==null)
                        throw new TInvalidDataTypeException('map_data_not_iterable');
        }

        /**
         * Merges iterable data into the map.
         * Existing data in the map will be kept and overwritten if the keys are the same.
         * @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 $key=>$value)
                                $this->add($key,$value);
                }
                else if($data!==null)
                        throw new TInvalidDataTypeException('map_data_not_iterable');
        }

        /**
         * Returns whether there is an element at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param mixed the offset to check on
         * @return boolean
         */
        public function offsetExists($offset)
        {
                return $this->contains($offset);
        }

        /**
         * Returns the element at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to retrieve element.
         * @return mixed the element at the offset, null if no element is found at the offset
         */
        public function offsetGet($offset)
        {
                return $this->itemAt($offset);
        }

        /**
         * Sets the element at the specified offset.
         * This method is required by the interface ArrayAccess.
         * @param integer the offset to set element
         * @param mixed the element value
         */
        public function offsetSet($offset,$item)
        {
                $this->add($offset,$item);
        }

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

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

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

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

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

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

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

        /**
         * Returns whether there is an element at current position.
         * This method is required by the interface Iterator.
         * @return boolean
         */
        public function valid()
        {
                return $this->_key!==false;
        }
}
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