Added TPagedDataSource.

author: xue <> 2006-01-17 04:05:08 +0000
committer: xue <> 2006-01-17 04:05:08 +0000
commit: 4317038c3cceecfc0f4bbe6565c78df48f4b556b (patch)
tree: f16a2b53390273731bb8245f43d4964ebecd4fb7 /framework/Collections/TPagedDataSource.php
parent: 473e29dfcec480bd146bc31e42f0f9438b7210f9 (diff)
1 files changed, 389 insertions, 0 deletions
diff --git a/framework/Collections/TPagedDataSource.php b/framework/Collections/TPagedDataSource.php
new file mode 100644
index 00000000..5632e778
--- /dev/null
+++ b/framework/Collections/TPagedDataSource.php
@@ -0,0 +1,389 @@
+<?php
+
+class TPagedDataSource extends TComponent implements IteratorAggregate
+{
+	/**
+	 * @var mixed original data source
+	 */
+	private $_dataSource=null;
+	/**
+	 * @var integer number of items in each page
+	 */
+	private $_pageSize=10;
+	/**
+	 * @var integer current page index
+	 */
+	private $_currentPageIndex=0;
+	/**
+	 * @var boolean whether to allow paging
+	 */
+	private $_allowPaging=false;
+	/**
+	 * @var boolean whether to allow custom paging
+	 */
+	private $_allowCustomPaging=false;
+	/**
+	 * @var integer user-assigned number of items in data source
+	 */
+	private $_virtualCount=0;
+
+	/**
+	 * @return mixed original data source. Defaults to null.
+	 */
+	public function getDataSource()
+	{
+		return $this->_dataSource;
+	}
+
+	/**
+	 * @param mixed original data source
+	 */
+	public function setDataSource($value)
+	{
+		if(!($value instanceof TMap) && !($value instanceof TList))
+		{
+			if(is_array($value) || ($value instanceof Traversable))
+				$value=new TMap($value);
+			else if($value!==null)
+				throw new TInvalidDataTypeException('pageddatasource_datasource_invalid');
+		}
+		$this->_dataSource=$value;
+	}
+
+	/**
+	 * @return integer number of items in each page. Defaults to 10.
+	 */
+	public function getPageSize()
+	{
+		return $this->_pageSize;
+	}
+
+	/**
+	 * @param integer number of items in each page
+	 */
+	public function setPageSize($value)
+	{
+		if(($value=TPropertyValue::ensureInteger($value))>0)
+			$this->_pageSize=$value;
+		else
+			throw new TInvalidDataValueException('pageddatasource_pagesize_invalid');
+	}
+
+	/**
+	 * @return integer current page index. Defaults to 0.
+	 */
+	public function getCurrentPageIndex()
+	{
+		return $this->_currentPageIndex;
+	}
+
+	/**
+	 * @param integer current page index
+	 */
+	public function setCurrentPageIndex($value)
+	{
+		if(($value=TPropertyValue::ensureInteger($value))<0)
+			$value=0;
+		$this->_currentPageIndex=$value;
+	}
+
+	/**
+	 * @return boolean whether to allow paging. Defaults to false.
+	 */
+	public function getAllowPaging()
+	{
+		return $this->_allowPaging;
+	}
+
+	/**
+	 * @param boolean whether to allow paging
+	 */
+	public function setAllowPaging($value)
+	{
+		$this->_allowPaging=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return boolean whether to allow custom paging. Defaults to false.
+	 */
+	public function getAllowCustomPaging()
+	{
+		return $this->_allowCustomPaging;
+	}
+
+	/**
+	 * @param boolean whether to allow custom paging
+	 */
+	public function setAllowCustomPaging($value)
+	{
+		$this->_allowCustomPaging=TPropertyValue::ensureBoolean($value);
+	}
+
+	/**
+	 * @return integer user-assigned number of items in data source Defaults to 0.
+	 */
+	public function getVirtualCount()
+	{
+		return $this->_virtualCount;
+	}
+
+	/**
+	 * @param integer user-assigned number of items in data source
+	 */
+	public function setVirtualCount($value)
+	{
+		if(($value=TPropertyValue::ensureInteger($value))>=0)
+			$this->_virtualCount=$value;
+		else
+			throw new TInvalidDataValueException('pageddatasource_virtualcount_invalid');
+	}
+
+	/**
+	 * @return integer number of items in current page
+	 */
+	public function getCount()
+	{
+		if($this->_dataSource===null)
+			return 0;
+		if(!$this->_allowPaging)
+			return $this->getDataSourceCount();
+		if(!$this->_allowCustomPaging && $this->getIsLastPage())
+			return $this->getDataSourceCount()-$this->getFirstIndexInPage();
+		return $this->_pageSize;
+	}
+
+	/**
+	 * @return integer number of pages
+	 */
+	public function getPageCount()
+	{
+		if($this->_dataSource===null)
+			return 0;
+		$count=$this->getDataSourceCount();
+		if(!$this->_allowPaging || $count<=0)
+			return 1;
+		return (int)(($count+$this->_pageSize-1)/$this->_pageSize);
+	}
+
+	/**
+	 * @return boolean whether the current page is the first page Defaults to false.
+	 */
+	public function getIsFirstPage()
+	{
+		if($this->_allowPaging)
+			return $this->_currentPageIndex===0;
+		else
+			return true;
+	}
+
+	/**
+	 * @return boolean whether the current page is the last page
+	 */
+	public function getIsLastPage()
+	{
+		if($this->_allowPaging)
+			return $this->_currentPageIndex===$this->getPageCount()-1;
+		else
+			return true;
+	}
+
+	/**
+	 * @return integer the index of the item in data source, where the item is the first in
+	 * current page
+	 */
+	public function getFirstIndexInPage()
+	{
+		if($this->_dataSource!==null && $this->_allowPaging && !$this->_allowCustomPaging)
+			return $this->_currentPageIndex*$this->_pageSize;
+		else
+			return 0;
+	}
+
+	/**
+	 * @return integer number of items in data source, if available
+	 */
+	public function getDataSourceCount()
+	{
+		if($this->_dataSource===null)
+			return 0;
+		else if($this->_allowCustomPaging)
+			return $this->_virtualCount;
+		else
+			return $this->_dataSource->getCount();
+	}
+
+	public function getIterator()
+	{
+		if($this->_dataSource instanceof TList)
+			return new TPagedListIterator($this->_dataSource,$this->getFirstIndexInPage(),$this->getCount());
+		else if($this->_dataSource instanceof TMap)
+			return new TPagedMapIterator($this->_dataSource,$this->getFirstIndexInPage(),$this->getCount());
+		else
+			return null;
+	}
+}
+
+
+
+/**
+ * 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 $Revision: $  $Date: $
+ * @package System.Collections
+ * @since 3.0
+ */
+class TPagedListIterator implements Iterator
+{
+	private $_list;
+	private $_startIndex;
+	private $_count;
+	private $_index;
+
+	/**
+	 * Constructor.
+	 * @param array the data to be iterated through
+	 */
+	public function __construct(TList $list,$startIndex,$count)
+	{
+		$this->_list=$list;
+		$this->_index=0;
+		$this->_startIndex=$startIndex;
+		if($startIndex+$count>$list->getCount())
+			$this->_count=$list->getCount()-$startIndex;
+		else
+			$this->_count=$count;
+	}
+
+	/**
+	 * Rewinds internal array pointer.
+	 * This method is required by the interface Iterator.
+	 */
+	public function rewind()
+	{
+		$this->_index=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->_index;
+	}
+
+	/**
+	 * Returns the current array item.
+	 * This method is required by the interface Iterator.
+	 * @return mixed the current array item
+	 */
+	public function current()
+	{
+		return $this->_list->itemAt($this->_startIndex+$this->_index);
+	}
+
+	/**
+	 * Moves the internal pointer to the next array item.
+	 * This method is required by the interface Iterator.
+	 */
+	public function next()
+	{
+		$this->_index++;
+	}
+
+	/**
+	 * Returns whether there is an item at current position.
+	 * This method is required by the interface Iterator.
+	 * @return boolean
+	 */
+	public function valid()
+	{
+		return $this->_index<$this->_count;
+	}
+}
+
+class TPagedMapIterator implements Iterator
+{
+	private $_map;
+	private $_startIndex;
+	private $_count;
+	private $_index;
+	private $_iterator;
+
+	/**
+	 * Constructor.
+	 * @param array the data to be iterated through
+	 */
+	public function __construct(TMap $map,$startIndex,$count)
+	{
+		$this->_map=$map;
+		$this->_index=0;
+		$this->_startIndex=$startIndex;
+		if($startIndex+$count>$map->getCount())
+			$this->_count=$map->getCount()-$startIndex;
+		else
+			$this->_count=$count;
+		$this->_iterator=$map->getIterator();
+	}
+
+	/**
+	 * Rewinds internal array pointer.
+	 * This method is required by the interface Iterator.
+	 */
+	public function rewind()
+	{
+		$this->_iterator->rewind();
+		for($i=0;$i<$this->_startIndex;++$i)
+			$this->_iterator->next();
+		$this->_index=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->_iterator->key();
+	}
+
+	/**
+	 * Returns the current array item.
+	 * This method is required by the interface Iterator.
+	 * @return mixed the current array item
+	 */
+	public function current()
+	{
+		return $this->_iterator->current();
+	}
+
+	/**
+	 * Moves the internal pointer to the next array item.
+	 * This method is required by the interface Iterator.
+	 */
+	public function next()
+	{
+		$this->_index++;
+		$this->_iterator->next();
+	}
+
+	/**
+	 * Returns whether there is an item at current position.
+	 * This method is required by the interface Iterator.
+	 * @return boolean
+	 */
+	public function valid()
+	{
+		return $this->_index<$this->_count;
+	}
+}
+
+?>
+\ No newline at end of file
author	xue <>	2006-01-17 04:05:08 +0000
committer	xue <>	2006-01-17 04:05:08 +0000
commit	4317038c3cceecfc0f4bbe6565c78df48f4b556b (patch)
tree	f16a2b53390273731bb8245f43d4964ebecd4fb7 /framework/Collections/TPagedDataSource.php
parent	473e29dfcec480bd146bc31e42f0f9438b7210f9 (diff)