diff options
Diffstat (limited to 'framework/Collections')
| -rw-r--r-- | framework/Collections/TPagedDataSource.php | 389 |
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;
+ }
+}
+
+?>
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