Idempiere extend product model

Question

I want to create a class that extends the idempiere product model to create a code from other fields but I don't know which class I should import or what method I should override.

org.compiere.model.MProduct:

public MProduct (X_I_Product impP)
{
    this (impP.getCtx(), 0, impP.get_TrxName());
    setClientOrg(impP);
    setUpdatedBy(impP.getUpdatedBy());

    // Value field:
    setValue(impP.getValue());
    setName(impP.getName());
    setDescription(impP.getDescription());
    setDocumentNote(impP.getDocumentNote());
    setHelp(impP.getHelp());
    setUPC(impP.getUPC());
    setSKU(impP.getSKU());
    setC_UOM_ID(impP.getC_UOM_ID());
    setM_Product_Category_ID(impP.getM_Product_Category_ID());
    setProductType(impP.getProductType());
    setImageURL(impP.getImageURL());
    setDescriptionURL(impP.getDescriptionURL());
    setVolume(impP.getVolume());
    setWeight(impP.getWeight());
}   //  MProduct

Answer 1

In one of the comments, you clarified that your intent is to "extend the MProduct class and override the method that saves the "VALUE" column".

To answer that, first let's define a simple version of MProduct class, with a few edits:

• it has only the setValue() method, since that's the only part relevant to your question (the other methods on MProduct are not relevant)
• the input parameter for setValue() was changed to int vs. the original type is in your example (whatever the return type is from impP.getValue())

Here's a simple version of MProduct:

class MProduct {
    void setValue(int value) {
        System.out.println("setValue() on MProduct");
    }
}

Here's a simple class which extends MProduct by overriding the setValue() method:

class CustomProduct extends MProduct {
    @Override
    void setValue(int value) {
        System.out.println("setValue() on CustomProduct");
        // custom code goes here
    }
}

Finally, here's a simple example showing usage of both of the above classes (both MProduct and CustomProduct):

public static void main(String[] args) {
    new CustomProduct().setValue(123);
    new MProduct().setValue(123);
}

And here's the output from running that example:

setValue() on CustomProduct
setValue() on MProduct