ahc.generic
Interface AttributeGetter
- public interface AttributeGetter
This interface serves to retrieve attributes from an object by successively calling get methods. The
methods that are to be called are encoded in the "accessPath" parameter.
For example,
attributeGetter.get (person, "address/city/name")
is equivalent to
person.getAddress().getCity().getName()
This sort of programming should be avoided when possible because it prevents compile time checks for
consistency and is slower than directly calling the attributes. It is however sometimes helpful when writing
generic code that should handle different situations and not know about the details of concrete business
classes, e.g. in a framework.
Note that such an approach can only work if all get methods that are called on the way are
public
, otherwise the generic code doing the lookup will not be able to "see" them and an
exception will result.
Several implementations of this interface are available; see
AttributeGetterFactory for details.
- Author:
- Arno Haase
Method Summary |
java.lang.Object |
get(java.lang.Object obj,
java.lang.String accessPath)
|
CHAR_SEPARATOR
public static final java.lang.String CHAR_SEPARATOR
- See Also:
- Constant Field Values
get
public java.lang.Object get(java.lang.Object obj,
java.lang.String accessPath)