CODEWITHSUNDEEP
javareflectionprimitive-typesgeneric-programming
John Jerrby
John Jerrby

Reputation: 1703

Check in reflection if type is primitive or type is object

Im using the following code to find class members in reflection that are primitive and some object ,my question is there is a way to identify if field is type primitive ,object ,class reference because i want to call to specific method according to the type. for example if field is primitive call to handlePrimitive if field type other type reference (in the example below SalesOrderItemPK primaryKey; )call to method handleClassReferance etc

just of understanding i need to get the class and invistigate it and create data according to the member type...

for (Object clsObj : listClsObj) {
        Field[] declaredFields = clsObj.getClass().getDeclaredFields();
        numOfEntries = 1;
        do {
            Object newInstance = clsObj.getClass().newInstance();

            for (Field field : declaredFields) {

                // Get member name & types

                Class<?> fieldType = field.getType();
                Type genericType = field.getGenericType();
                String fieldTypeName = fieldType.getName();
                String memberName = field.getName();


                if (genericType instanceof ParameterizedType) {
                    ParameterizedType pt = (ParameterizedType) genericType;
                    for (Type typeOfReferance : pt.getActualTypeArguments()) {

                        String classTypeName = typeOfReferance.toString();
                        String[] parts = classTypeName.split(" ");
                        memberReferance = parts[1];

here i want to call to specific method that can handle fields according to the data types

public static SwitchInputType<?> switchInput(final String typeName, final String memberName, final int cnt) {
    if (typeName.equals("java.lang.String")) {
        return new SwitchInputType<String>(new String(memberName + " " + cnt));
    } else if (typeName.equals("char")) {
        return new SwitchInputType<Character>(new Character('a'));

the class for example should look like this and I need to know for primaryKey key to create an object.

@Entity
public class SalesOrderItem 
{
    @EmbeddedId
    SalesOrderItemPK primaryKey; 
    private String ProductId;
    private String Notes;

Upvotes: 4

Views: 15746

Answers (1)

Bozho
Bozho

Reputation: 597076

If you don't call .toString(), but instead cast Type to Class, you get .isPrimitive()

Upvotes: 17

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