objectify-led, a Java library for binding properties at runtime has just been released at Objectify.
Instead of having chunks of code such as
public class Foo
{
private static String BLAH = "default-value";
private String myString;
private int myInt = -1;
public static void main(String[] args)
{
if (System.getProperty("blah.value) != null)
{
BLAH = System.getProperty("blah.value");
}
Foo foo = new Foo();
if (System.getProperty("mystring.value) != null)
{
foo.myString = System.getProperty("mystring.value");
}
if (System.getProperty("myint.value) != null)
{
try
{
String intValue = System.getProperty("myint.value");
foo.myInt = Integer.parseInt(intValue;
}
catch (NumberFormatException e)
{
...
}
}
}
...
}
you can instead use objectify-led to bind the properties for you :
public class Foo
{
@Property("blah.value");
private static String BLAH = "default-value";
@Property("mystring.value");
private String myString;
@Property("myint.value");
private int myInt = -1;
public static void main(String[] args)
{
Foo foo = new Foo();
new PropertySetter().process(foo);
}
...
}
By default, Strings and all primitive/wrapper classes are handled. If you wish to convert a property value into a specific class, you just need to plug in your own object factory.
Additionally, the source of the properties is completely up to you. By default, properties are taken from the system environment and any Properties objects you may have plugged in; custom property contexts can be used to provide a facade to more complex value stores.
Static values are handled in two ways. If an instance of a class is processed, both its instance and static members are populated if necessary. If a class is processed, just the static members are populated (what with the lack of an instance and everything…).
Final properties- despite the ability to do so via reflection – are not set. This may or may not change depending on feedback.
If you want to try out objectify-led, you can get the binaries and sources from the links below, or directly from http://www.objectify.be. They will be submitted to the well-known Maven repositories in the coming days.
Binaries:
Sources: