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Diffstat (limited to 'framework/Data/TDataFieldAccessor.php')
| -rw-r--r-- | framework/Data/TDataFieldAccessor.php | 118 |
1 files changed, 118 insertions, 0 deletions
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 © 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);
+ }
+ }
+}
+
+?>
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