From b8afe4bc5ecc7bcd371d7bd9ca05df356f7aca18 Mon Sep 17 00:00:00 2001
From: xue <>
Date: Tue, 14 Feb 2006 17:30:53 +0000
Subject: Added TDataFieldAccessor and modified TDataGridColumn accordingly.

---
 framework/Data/TDataFieldAccessor.php | 118 ++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 framework/Data/TDataFieldAccessor.php

(limited to 'framework/Data/TDataFieldAccessor.php')

diff --git a/framework/Data/TDataFieldAccessor.php b/framework/Data/TDataFieldAccessor.php
new file mode 100644
index 00000000..2c2be00f
--- /dev/null
+++ b/framework/Data/TDataFieldAccessor.php
@@ -0,0 +1,118 @@
+<?php
+/**
+ * TDataFieldAccessor class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Revision: $  $Date: $
+ * @package System.Data
+ */
+
+/**
+ * TDataFieldAccessor class
+ *
+ * TDataFieldAccessor is a utility class that provides access to a field of some data.
+ * The accessor attempts to obtain the field value in the following order:
+ * - If the data is an array, then the field is treated as an array index
+ *   and the corresponding element value is returned;
+ * - If the data is a TMap or TList object, then the field is treated as a key
+ *   into the map or list, and the corresponding value is returned.
+ * - If the data is an object, the field is treated as a property or subproperty
+ *   defined with getter methods. For example, if the object has a method called
+ *   getMyValue(), then field 'MyValue' will retrive the result of this method call.
+ *   If getMyValue() returns an object which contains a method getMySubValue(),
+ *   then field 'MyValue.MySubValue' will return that method call result.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Revision: $  $Date: $
+ * @package System.Data
+ * @since 3.0
+ */
+class TDataFieldAccessor
+{
+	/**
+	 * Evaluates the data value at the specified field.
+	 * - If the data is an array, then the field is treated as an array index
+	 *   and the corresponding element value is returned;
+	 * - If the data is a TMap or TList object, then the field is treated as a key
+	 *   into the map or list, and the corresponding value is returned.
+	 * - If the data is an object, the field is treated as a property or subproperty
+	 *   defined with getter methods. For example, if the object has a method called
+	 *   getMyValue(), then field 'MyValue' will retrive the result of this method call.
+	 *   If getMyValue() returns an object which contains a method getMySubValue(),
+	 *   then field 'MyValue.MySubValue' will return that method call result.
+	 * @param mixed data containing the field value, can be an array, TMap, TList or object.
+	 * @param mixed field value
+	 * @return mixed value at the specified field
+	 * @throw TInvalidDataValueException if field or data is invalid
+	 */
+	public static function getDataFieldValue($data,$field)
+	{
+		if(Prado::getApplication()->getMode()===TApplication::STATE_PERFORMANCE)
+		{
+			if(is_array($data))
+				return $data[$field];
+			else if(($data instanceof TMap) || ($data instanceof TList))
+				return $data->itemAt($field);
+			else if(is_object($data))
+			{
+				if(strpos($field,'.')===false)  // simple field
+					return call_user_func(array($data,'get'.$field));
+				else // field in the format of xxx.yyy.zzz
+				{
+					$object=$data;
+					foreach(explode('.',$field) as $f)
+						$object=call_user_func(array($object,'get'.$f));
+					return $object;
+				}
+			}
+			else
+				throw new TInvalidDataValueException('datafieldaccessor_data_invalid',$field);
+		}
+		else
+		{
+			if(is_array($data))
+			{
+				if(isset($data[$field]))
+					return $data[$field];
+				else
+					throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field);
+			}
+			else if(($data instanceof TMap) || ($data instanceof TList))
+			{
+				if($data->contains($field))
+					return $data->itemAt($field);
+				else
+					throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field);
+			}
+			else if(is_object($data))
+			{
+				if(strpos($field,'.')===false)  // simple field
+				{
+					$getter='get'.$field;
+					if(is_callable(array($data,$getter)))
+						return call_user_func(array($data,$getter));
+				}
+				else // field in the format of xxx.yyy.zzz
+				{
+					$object=$data;
+					foreach(explode('.',$field) as $f)
+					{
+						$getter='get'.$f;
+						if(is_callable(array($object,$getter)))
+							$object=call_user_func(array($object,$getter));
+						else
+							throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field);
+					}
+					return $object;
+				}
+			}
+			else
+				throw new TInvalidDataValueException('datafieldaccessor_data_invalid',$field);
+		}
+	}
+}
+
+?>
\ No newline at end of file
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