I have the following complex POJO class Invoice
public class Measure {
private String id;
private Float value;
public String getId() { return id; }
public void setId(String id) { this.id = id; }
public Float getValue() { return value; }
public void setValue(Float value) { this.value = value; }
}
public class LineItem {
private Integer lineNumber;
private Measure shipped;
private List<LineItem> lineItems;
public Integer getLineNumber() { return lineNumber; }
public void setLineNumber(Integer lineNumber) { this.lineNumber = lineNumber; }
public Measure getShipped() { return shipped; }
public void setShipped(Measure shipped) { this.shipped = shipped; }
public List<LineItem> getLineItems() { return lineItems; }
public void setLineItems(List<LineItem> lineItems) { this.lineItems = lineItems; }
}
public class Invoice {
private String originUid;
private String vehicleUid;
private List<LineItem> lineItems;
public String getOriginUid() { return originUid; }
public void setOriginUid(String originUid) { this.originUid = originUid; }
public String getVehicleUid() { return vehicleUid; }
public void setVehicleUid(String vehicleUid) { this.vehicleUid = vehicleUid; }
public List<LineItem> getLineItems() { return lineItems; }
public void setLineItems(List<LineItem> lineItems) { this.lineItems = lineItems; }
}
Now I want to traverse deep into every single field including nested objects in the Invoice object and update them using Reflection.
I can call updateIncomingObject() recursively. But I need to know how to get the nested objects out of the field as shown in the commented section.
public Object updateIncomingObject(Object incomingObject) {
Field[] incoming = incomingObject.getClass().getDeclaredFields();
for (Field incomingField : incoming) {
incomingField.setAccessible(true);
if (incomingField.getType().isArray()) {
// for (each occurrence in thisArray ???) {
// Object result = updateIncomingObject(occurrence);
// thisArray.set(index,result);
// }
// incomingField.set(incomingObject, thisArray);
}
else if (!incomingField.getType().getName().startsWith("java.lang")) {
// Object objInstance = incomingField.???;
// Object result = updateIncomingObject(objInstance);
// incomingField.set(incomingObject, result);
}
else {
if (incomingField.getType().equals(String.class) && incomingField.get(incomingObject) != null) {
String trimmed = incomingField.get(incomingObject).toString().trim();
incomingField.set(incomingObject, trimmed);
}
}
}
return incomingObject;
}
How do I turn field into object instance?
