Copy POJO content from one bean to another

Question

I have few Pojos in different packages, each POJO contains set of the another pojo from the same package. I need to copy all items with the same name from Package B Pojos to

Answer 1

Using PropertyUtils, you can copy onky the non null properties as follows:

    private void copyNonNullProperties(Object destination,
            Object source) {
        try {
            PropertyUtils.describe(source).entrySet().stream()
                    .filter(source -> source.getValue() != null)
                    .filter(source -> !source.getKey().equals("class"))
                    .forEach(source -> {
                        try {
                            PropertyUtils.setProperty(destination, source.getKey(), source.getValue());
                        } catch (Exception e22) {
                            log.error("Error setting properties : {}", e22.getMessage());
                        }
                    });

        } catch (Exception e1) {
            log.error("Error setting properties : {}", e1.getMessage());
        }

    }

Answer 2

Well.. Dozer may be just the thing you're looking for.

. . . its an object to object mapping framework. The idea is that:

• Usually it will map by convention.
• You can override this convention with a mapping file.

. . therefore mapping files are as compact as possible. Its useful for many cases, such as mapping a use-case specify service payload on to the reusable core model objects.

When delivering the SpringSource training courses we used to point out this framework very often.

Answer 3

Copying fields values are a need I almost every project, for example for do the clone(). I also think that for accomplish some goals isn't necessary import .jars for using only one function. I would like share some little code in which I was working, there are some things that I left in the inkwell but in general it do the work. In this case I use reflection.

public class ObjectCopyTools {

static String[] bases = new String[] {"byte", "short", "int", "long", "float", "double", "char", "boolean"};
static String[] equivalents = new String[] {"Byte", "Short", "Integer", "Long", "Float", "Double", "Character", "Boolean"};

static {

}

private static boolean areEquivalents(String type1, String type2){
    for (int i = 0; i < bases.length; i++) {
        if((type1.equals(bases[i]) && type2.equals(equivalents[i])) 
                || (type2.equals(bases[i]) && type1.equals(equivalents[i]))){
            return true;
        }
    }
    return false;
}

public static <T extends Object, Y extends Object> Y deepReflectionObjectCopy(T origin, Class<Y> resultClass) {
    Class<? extends Object> origClass = origin.getClass();
    Y resultObject = null;
    for (Constructor<?> constructor : resultClass.getConstructors()) {
        if (constructor.getParameterCount() == 0) {
            try {
                resultObject = (Y) constructor.newInstance();
            }catch (InstantiationException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            }
            break;
        }
    }
    if(resultObject == null){
        return null;
    }
    Field[] origFields = origClass.getDeclaredFields();
    Field[] destFields = resultObject.getClass().getDeclaredFields();

    Object value = null;
    for(Field dstField: destFields){
        try {
            Field tempOrigField = origClass.getDeclaredField(dstField.getName());
            if(tempOrigField.getType().equals(dstField.getType())
                    || areEquivalents(tempOrigField.getType().getSimpleName(), dstField.getType().getSimpleName())){
                dstField.set(resultObject, tempOrigField.get(origin));
            }
        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
        }
    }
    return resultObject;
}

Hope this help.

Answer 4

If you already have spring dependencies you could use org.springframework.beans.BeanUtils

BeanUtils.copyProperties(from, to);

Answer 5

Any reason why Apache BeanUtils.copyProperties does not work?

Answer 6

If DRY is a bedrock principle of computer science, what reason can you give for two identical, parallel object graphs? Not only have you doubled your maintenance burden, but now you have to develop a recursive method to do nothing but ferry data from one to the other.