From f97358b8da7a2cbb1bf6438298286f7290616381 Mon Sep 17 00:00:00 2001
From: xue <>
Date: Sat, 4 Feb 2006 04:43:40 +0000
Subject: Fixed a bug in TList and TMap about the usage of isset.

---
 framework/Collections/TList.php            | 27 +++++++++++++++++----------
 framework/Collections/TMap.php             | 14 ++++----------
 framework/Web/UI/WebControls/TDataGrid.php |  4 +++-
 3 files changed, 24 insertions(+), 21 deletions(-)

diff --git a/framework/Collections/TList.php b/framework/Collections/TList.php
index f2628231..132f2be6 100644
--- a/framework/Collections/TList.php
+++ b/framework/Collections/TList.php
@@ -90,7 +90,7 @@ class TList extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function itemAt($index)
 	{
-		if(isset($this->_d[$index]))
+		if($index>=0 && $index<$this->_c)
 			return $this->_d[$index];
 		else
 			throw new TInvalidDataValueException('list_index_invalid',$index);
@@ -149,15 +149,17 @@ class TList extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function removeAt($index)
 	{
-		if(isset($this->_d[$index]))
+		if($index>=0 && $index<$this->_c)
 		{
-			$item=$this->_d[$index];
-			if($index===$this->_c-1)
-				unset($this->_d[$index]);
+			$this->_c--;
+			if($index===$this->_c)
+				return array_pop($this->_d);
 			else
+			{
+				$item=$this->_d[$index];
 				array_splice($this->_d,$index,1);
-			$this->_c--;
-			return $item;
+				return $item;
+			}
 		}
 		else
 			throw new TInvalidDataValueException('list_index_invalid',$index);
@@ -245,7 +247,7 @@ class TList extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function offsetExists($offset)
 	{
-		return isset($this->_d[$offset]);
+		return ($offset>=0 && $offset<$this->_c);
 	}
 
 	/**
@@ -257,7 +259,7 @@ class TList extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function offsetGet($offset)
 	{
-		if(isset($this->_d[$offset]))
+		if($offset>=0 && $offset<$this->_c)
 			return $this->_d[$offset];
 		else
 			throw new TInvalidDataValueException('list_index_invalid',$offset);
@@ -317,6 +319,10 @@ class TListIterator implements Iterator
 	 * @var integer index of the current item
 	 */
 	private $_i;
+	/**
+	 * @var integer count of the data items
+	 */
+	private $_c;
 
 	/**
 	 * Constructor.
@@ -326,6 +332,7 @@ class TListIterator implements Iterator
 	{
 		$this->_d=&$data;
 		$this->_i=0;
+		$this->_c=count($this->_d);
 	}
 
 	/**
@@ -373,7 +380,7 @@ class TListIterator implements Iterator
 	 */
 	public function valid()
 	{
-		return isset($this->_d[$this->_i]);
+		return $this->_i<$this->_c;
 	}
 }
 
diff --git a/framework/Collections/TMap.php b/framework/Collections/TMap.php
index be37a46b..4d810503 100644
--- a/framework/Collections/TMap.php
+++ b/framework/Collections/TMap.php
@@ -97,14 +97,12 @@ class TMap extends TComponent implements IteratorAggregate,ArrayAccess
 
 	/**
 	 * Adds an item into the map.
-	 * Note, if the specified key already exists, the old value will be removed first.
+	 * Note, if the specified key already exists, the old value will be overwritten.
 	 * @param mixed key
 	 * @param mixed value
 	 */
 	public function add($key,$value)
 	{
-		if(isset($this->_d[$key]))
-			$this->remove($key);
 		$this->_d[$key]=$value;
 	}
 
@@ -116,7 +114,7 @@ class TMap extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function remove($key)
 	{
-		if(isset($this->_d[$key]))
+		if(isset($this->_d[$key]) || array_key_exists($key,$this->_d))
 		{
 			$value=$this->_d[$key];
 			unset($this->_d[$key]);
@@ -141,7 +139,7 @@ class TMap extends TComponent implements IteratorAggregate,ArrayAccess
 	 */
 	public function contains($key)
 	{
-		return isset($this->_d[$key]);
+		return isset($this->_d[$key]) || array_key_exists($key,$this->_d);
 	}
 
 	/**
@@ -305,11 +303,7 @@ class TMapIterator implements Iterator
 	 */
 	public function next()
 	{
-		do
-		{
-			$this->_key=next($this->_keys);
-		}
-		while(!isset($this->_d[$this->_key]) && $this->_key!==false);
+		$this->_key=next($this->_keys);
 	}
 
 	/**
diff --git a/framework/Web/UI/WebControls/TDataGrid.php b/framework/Web/UI/WebControls/TDataGrid.php
index f8dd0b17..f7f51e04 100644
--- a/framework/Web/UI/WebControls/TDataGrid.php
+++ b/framework/Web/UI/WebControls/TDataGrid.php
@@ -773,7 +773,7 @@ class TDataGrid extends TBaseDataList
 			else
 				$this->_autoColumns=null;
 			$state=$this->getViewState('Columns',array());
-			if($this->_columns)
+			if($this->_columns && $this->_columns->getCount()===count($state))
 			{
 				$i=0;
 				foreach($this->_columns as $column)
@@ -824,6 +824,8 @@ class TDataGrid extends TBaseDataList
 		$columns=new TList($this->getColumns());
 		$columns->mergeWith($this->_autoColumns);
 
+		$items=$this->getItems();
+
 		if($columns->getCount()>0)
 		{
 			foreach($columns as $column)
-- 
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