Develop Reference

how to send string constant to a field value using dozer mapping?

'<mapping map-id="vehicle Info">
<class-a>vehicle Info</class-a>
<class-b>uninsured</class-b>
<field>
<a>CONSTANT_CAR</a>
<b>car.value</b>
</field>
</mapping>'
I'm trying to send the constant value of "CONSTANT_CAR" into the field of "car.value" which is located inside the vehicle
Can someone please guide me how can I pass the constant value to a setter which is located in the destination class.

You should be able to access the constant by setting the 'is-accessible="true"' for the constant field. So, your mapping could look something like this:
<mapping map-id="vehicle-info">
<class-a>path.to.VehicleInfo</class-a>
<class-b>path.to.Uninsured</class-b>
<field>
<a is-accessible="true">CONSTANT_CAR</a>
<b>car.value</b>
</field>
</mapping>
Make sure when naming the classes in the <class-a> and <class-b> tags you put the full path to the class.
I just tested with some sample code and it mapped the constant as expected. Let me know if it works for you!

Call custom converter after default in dozer

Does Dozer could call custom converter after default?
I want to create something like chain. At first I want to call default converter to make most of convertion work and only after that call custom converter to populate complex fields?
EDIT
by default when I create custom converter I need to override two methods. Each of this method has 2 arguments source object and target object. But when we call convertTo method second argument(target object) equals to null. So may be I need to specify something in mapping file to make dozer process default converter before custom?
Sorry for bad english

After look into source code I understand that this probably imposible. Instead of this dozer library propose using custom-converters at field level like this:
<mapping wildcard="false" >
<class-a>package.A</class-a>
<class-b>package.B</class-b>
<field>
<a>id</a>
<b>id</b>
</field>
<field custom-converter="test.AtoBNameFieldCustomConverter">
<a>name</a>
<b>name</b>
</field>
</mapping>
May be this help someone.

Is there a way to utilize a generic mapping in dozer instead of duplicating it?

I am working on writing a dozer mapping to map fields from ClassA to ClassB. I have two use cases to address:
Use Case 1: Map all fields from ClassA to ClassB including "null" fields. This way I would be able to wipe out the value of a field from ClassB if it doesn't have a value in ClassA.
Use Case 2: Map only "not null" fields from ClassA to ClassB. This way I would be able to preserve fields in ClassB even when they don't have values in ClassA.
Currently, I have to write two different mappings to address this situation. The mappings are exactly alike, apart from the value of the attribute "map-null".
Question:
Is there a way to avoid this duplication of mappings and set the "map-null" attribute at runtime and just have one generic mapping defined in Dozer?
<mapping map-id="myMappings1" map-null="true">
<class-a>test.ClassA</class-a>
<class-b>test.ClassB</class-b>
<field>
<a>sampleVariable</a>
<b>samplevariable</b>
</field>
</mapping>
<mapping map-id="myMappings2" map-null="false">
<class-a>test.ClassA</class-a>
<class-b>test.ClassB</class-b>
<field>
<a>sampleVariable</a>
<b>samplevariable</b>
</field>
</mapping>

Dozer custom converter - passing the whole object as field 'A'

I'd like to map a CustomConverter in dozer but I'd like to pass the whole current object as the source. All of the examples in the dozer CustomConverter documentation pass a field of the input object as the source and not the whole object.
I'd like to do something like this:
<mapping>
<class-a>foo.bar.InputObject</class-a>
<class-b>foo.bar.OutputObject</class-b>
<field custom-converter="foo.bar.MyConverter">
<a>this</a> <!-- how do I access the whole value and not just a field? -->
<b>custom</b>
</field>
<field>
<a>anotherField</a>
<b>anotherField</b>
</field>
</mapping>
And
public class MyConverter extends DozerConverter<InputObject, String> {
...
public String convertTo(InputObject input, String custom) {
// do some transformation
}
}
CustomConverter docs here:
http://dozer.sourceforge.net/documentation/customconverter.html

Try implementing the CustomConverter instead of DozerConverter and try passing it as:
<field custom-converter="my.custom.converter">
<a>this</a>
<b>myfield</b>
</field>

If you use the field mapping you want to identify the attribute by using "key":
<field custom-converter="de.xyz.custom.MyConverter">
<a key="variablename">this</a>
<b>targetvariablename</b>
</field>
You can then proceed to implement the converter. You will be given the Object containing the field "variablename" as source. If for example you do not have a setter for a list value (like I had for whatever reason...) you are now able to manipulate the source object the way you need to.

How to find mappings of attribute in Dozer at runtime?

I use Dozer to map between Java beans. I have a dozer mapping file with all the mappings present in it. A sample mapping is shown below:
<mapping>
<class-a>com.xyz.A</class-a>
<class-b>com.xyz.B</class-b>
<field>
<a>key</a>
<b>id</b>
</field>
<field>
<a>actionId</a>
<b>action</b>
</field>
</mapping>
Now I want to find the mappings at runtime. For example, give a field as a string com.xyz.A.key, I want to find that it maps to com.xyz.B.id programatically. I looked into the Dozer API (org.dozer.Mapper interface) and it exposes methods only to map beans.
So my question is: is there an API to find the mappings programatically?