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Nilus Checker
Can check a Nilus class to see if it's missing required objects and be used to remove empty fields (e.g. zero length strings) from an object.
This commit is contained in:
Douglas Gillespie
parent
b78bbe8b9e
commit
fdfa9a20d8
@ -1,9 +1,17 @@
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package tethys.niluswraps;
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import java.lang.annotation.Annotation;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.ArrayList;
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import java.util.List;
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import org.renjin.methods.Methods;
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import nilus.Calibration;
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import nilus.Calibration.QualityAssurance;
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import nilus.Helper;
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import nilus.ResponsibleParty;
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/**
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@ -14,11 +22,282 @@ import nilus.ResponsibleParty;
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*/
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public class NilusChecker {
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public static void main(String args[]) {
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Calibration cal = new Calibration();
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try {
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Helper.createRequiredElements(cal);
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} catch (IllegalArgumentException | IllegalAccessException | InstantiationException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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QualityAssurance qa;
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cal.setQualityAssurance(qa = new QualityAssurance());
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qa.setComment("Nothing to comment on ");
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int removed = removeEmptyFields(cal);
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System.out.printf("%d fields removed from object %s\n", removed, cal);
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ArrayList<Field> missing = checkEmptyFields(cal);
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for (Field field : missing) {
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System.out.printf("Field %s is required but empty in %s\n", field.getName(), field.getDeclaringClass().toString());
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}
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}
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public static ArrayList<Field> findEmptyFields(Object nilusObject) {
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return findEmptyFields(nilusObject, new ArrayList<Field>());
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}
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public static ArrayList<Field> findEmptyFields(Object nilusObject, ArrayList<Field> found) {
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if (nilusObject == null) {
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return found;
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}
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int removed = 0;
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Class<? extends Object> nilusClass = nilusObject.getClass();
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if (nilusClass.getCanonicalName().contains("java.lang")) {
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return found;
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}
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Method[] methods = nilusClass.getDeclaredMethods();
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Field[] fields = nilusClass.getDeclaredFields();
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for (int i = 0; i < fields.length; i++) {
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Method getter = findGetter(fields[i], methods);
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if (getter == null) {
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System.out.printf("Unable to find getter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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}
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// if (setter == null) {
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// System.out.printf("Unable to find setter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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// }
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boolean required = isRequired(fields[i]);
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// System.out.printf("Field %30s is %s required\n", fields[i].getName(), required ? " " : "NOT");
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Object gotObj = null;
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try {
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gotObj = getter.invoke(nilusObject, new Object[0]);
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} catch (IllegalAccessException | InvocationTargetException e) {
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System.out.printf("Unable to invoce getter %s on %s\n", getter.getName(), nilusObject);
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continue;
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}
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boolean empty = isEmpty(gotObj);
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if (empty) {
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found.add(fields[i]);
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}
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else {
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found = findEmptyFields(gotObj, found);
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}
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}
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return found;
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}
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/**
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* Remove empty fields from a nilus object. <br>
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* An empty field is a field that is null, or has a String that is empty, or
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* only contains elements which are all themselves empty. i.e. an object that references
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* empty objects will be considered empty.
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* @param nilusObject
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* @return number of empty fields removed.
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*/
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public static int removeEmptyFields(Object nilusObject) {
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if (nilusObject == null) {
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return 0;
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}
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int removed = 0;
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Class<? extends Object> nilusClass = nilusObject.getClass();
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if (nilusClass.getCanonicalName().contains("java.lang")) {
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return 0;
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}
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Method[] methods = nilusClass.getDeclaredMethods();
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Field[] fields = nilusClass.getDeclaredFields();
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for (int i = 0; i < fields.length; i++) {
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Method getter = findGetter(fields[i], methods);
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Method setter = findSetter(fields[i], methods);
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if (getter == null) {
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System.out.printf("Unable to find getter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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}
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if (setter == null) {
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System.out.printf("Unable to find setter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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}
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boolean required = isRequired(fields[i]);
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// System.out.printf("Field %30s is %s required\n", fields[i].getName(), required ? " " : "NOT");
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Object gotObj = null;
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try {
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gotObj = getter.invoke(nilusObject, null);
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} catch (IllegalAccessException | InvocationTargetException e) {
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System.out.printf("Unable to invoce getter %s on %s\n", getter.getName(), nilusObject);
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continue;
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}
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boolean empty = isEmpty(gotObj);
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if (empty && gotObj != null) {
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try {
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System.out.printf("Removing empty field %s in object %s\n", fields[i].getName(), nilusObject);
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// Object args = new Object[1];
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setter.invoke(nilusObject, new Object[1]);
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removed++;
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} catch (IllegalAccessException | InvocationTargetException e) {
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System.out.printf("Unable to invoce setter %s on %s\n", getter.getName(), nilusObject);
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continue;
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}
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}
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else {
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removed += removeEmptyFields(gotObj);
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}
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}
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return removed;
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}
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/**
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* Check an object for empty and required fields.
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* @param nilusObject
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* @return a list of required empty fields in the nilusObjec and any objects references by that object.
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*/
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public static ArrayList<Field> checkEmptyFields(Object nilusObject) {
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return checkEmptyFields(nilusObject, new ArrayList<Field>());
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}
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/**
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* Check an object for empty and required fields.
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* @param nilusObject
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* @param emptyFields
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* @return
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*/
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private static ArrayList<Field> checkEmptyFields(Object nilusObject, ArrayList<Field> emptyFields) {
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if (nilusObject == null) {
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return emptyFields;
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}
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Class<? extends Object> nilusClass = nilusObject.getClass();
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if (nilusClass.isPrimitive()) {
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return emptyFields;
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}
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if (nilusClass.getCanonicalName().contains("java.lang")) {
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return emptyFields;
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}
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Method[] methods = nilusClass.getDeclaredMethods();
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Field[] fields = nilusClass.getDeclaredFields();
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for (int i = 0; i < fields.length; i++) {
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Method getter = findGetter(fields[i], methods);
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Method setter = findSetter(fields[i], methods);
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if (getter == null) {
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System.out.printf("Unable to find getter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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}
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if (setter == null) {
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System.out.printf("Unable to find setter for field %s in %s\n", fields[i].getName(), nilusClass.getName());
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}
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boolean required = isRequired(fields[i]);
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// System.out.printf("Field %30s is %s required\n", fields[i].getName(), required ? " " : "NOT");
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Object gotObj = null;
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try {
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gotObj = getter.invoke(nilusObject, null);
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} catch (IllegalAccessException | InvocationTargetException e) {
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System.out.printf("Unable to invoce getter %s on %s\n", getter.getName(), nilusObject);
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continue;
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}
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boolean empty = isEmpty(gotObj);
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if (empty) {
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if (required) {
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emptyFields.add(fields[i]);
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}
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}
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else {
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checkEmptyFields(gotObj, emptyFields);
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}
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// if (required == true && empty == true) {
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// System.out.printf("Field %s is required but empty in %s\n", fields[i].getName(), nilusObject.toString());
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// }
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}
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return emptyFields;
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}
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/**
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* See if afield has an annotation that indicates it's required.
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* @param field field
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* @return required
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*/
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private static boolean isRequired(Field field) {
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Annotation[] annots = field.getAnnotations();
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for (int a = 0; a < annots.length; a++) {
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// System.out.printf("Field %s has annotation %d %s\n", fields[i].getName(), a, annots[a].toString());
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String str = annots[a].toString();
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if (str.contains("required=true")) {
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return true;
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}
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}
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return false;
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}
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/**
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* Find a getter for a field. This will either be get... or is...
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* @param field
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* @param methods list of methods to search
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* @return found method or null
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*/
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private static Method findGetter(Field field, Method[] methods) {
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String name = field.getName();
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String poss = "get"+name;
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Method found = findMethod(poss, methods);
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if (found != null) {
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return found;
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}
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poss = "is" + name;
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return findMethod(poss, methods);
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}
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/**
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* Fine a setter for a field. This will always be set...
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* @param field field
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* @param methods list of methods to search
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* @return found method or null
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*/
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private static Method findSetter(Field field, Method[] methods) {
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String name = field.getName();
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String poss = "set" + name;
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return findMethod(poss, methods);
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}
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/**
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* Find a method based on it's name (case insensitive).
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* @param name name of method
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* @param methods list of methods to search
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* @return found method or null
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*/
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private static Method findMethod(String name, Method[] methods) {
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for (int i = 0; i < methods.length; i++) {
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if (methods[i].getName().equalsIgnoreCase(name)) {
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return methods[i];
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}
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}
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return null;
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}
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/**
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* Test if an object is empty. <br>
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* An object is considered empty if any of the following criteria are met:
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* <ul>
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* <li>The object is null</li>
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* <li>The object is a zero length string</li>
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* <li>The object is not null, but all of it's fields satisfy this same criteria of being empty</li>
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* <li>The object is a list which has no elements</li>
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* </ul>
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* Primitive types are never empty.
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* @param nilusObject
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* @return true if it's empty
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*/
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public static boolean isEmpty(Object nilusObject) {
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boolean empty = true;
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if (nilusObject == null) {
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return true;
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}
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if (nilusObject instanceof String) {
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String str = (String) nilusObject;
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return (str.length() == 0);
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}
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if (nilusObject instanceof List) {
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return isEmptyList((List) nilusObject);
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}
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if (nilusObject.getClass().isPrimitive()) {
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return false;
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}
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boolean empty = true;
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// and check all getters
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Class<? extends Object> nilusClass = nilusObject.getClass();
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Method[] methods = nilusClass.getDeclaredMethods();
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@ -59,13 +338,23 @@ public class NilusChecker {
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return empty;
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}
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private static boolean isEmptyList(List got) {
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if (got == null) {
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/**
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* A list is considered empty if it has no elements
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* @param list
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* @return true if empty
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*/
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private static boolean isEmptyList(List list) {
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if (list == null) {
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return true;
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}
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return got.size() == 0;
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return list.size() == 0;
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}
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/**
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* A String is empty if it is null or of zero length
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* @param string string
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* @return true if empty
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*/
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public static boolean isEmptyString(String string) {
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if (string == null || string.length() == 0) {
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return true;
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