diff options
| author | xue <> | 2006-03-31 12:42:22 +0000 |
|---|---|---|
| committer | xue <> | 2006-03-31 12:42:22 +0000 |
| commit | 6845c00a3f752abecd9ef763848329bceaf63df4 (patch) | |
| tree | d573c37ad864edde9a04f1c7b415afe6c2a9c1ef /framework/Util/TDataFieldAccessor.php | |
| parent | 06fdd252452217716b1062b632fd2fc2195a66e2 (diff) | |
Reorganized folders under framework. This may break existing applications.
Diffstat (limited to 'framework/Util/TDataFieldAccessor.php')
| -rw-r--r-- | framework/Util/TDataFieldAccessor.php | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/framework/Util/TDataFieldAccessor.php b/framework/Util/TDataFieldAccessor.php new file mode 100644 index 00000000..09512a28 --- /dev/null +++ b/framework/Util/TDataFieldAccessor.php @@ -0,0 +1,117 @@ +<?php
+/**
+ * TDataFieldAccessor class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright © 2005 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Revision: $ $Date: $
+ * @package System.Util
+ */
+
+/**
+ * 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.Util
+ * @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($data) || ($data instanceof ArrayAccess))
+ return $data[$field];
+ else if(is_object($data))
+ {
+ if(strpos($field,'.')===false) // simple field
+ {
+ if(property_exists($data,$field))
+ return $data->{$field};
+ else
+ 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($data) || ($data instanceof ArrayAccess))
+ {
+ if(isset($data[$field]) || $data[$field]===null)
+ return $data[$field];
+ else
+ throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field);
+ }
+ else if(is_object($data))
+ {
+ if(strpos($field,'.')===false) // simple field
+ {
+ if(property_exists($data,$field))
+ return $data->{$field};
+ else if(is_callable(array($data,'get'.$field)))
+ return call_user_func(array($data,'get'.$field));
+ else
+ throw new TInvalidDataValueException('datafieldaccessor_datafield_invalid',$field);
+ }
+ 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);
+ }
+ }
+}
+
+?>
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