info.unterrainer.commons.jreutils.Reflecting Maven / Gradle / Ivy
package info.unterrainer.commons.jreutils;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import lombok.experimental.UtilityClass;
@UtilityClass
public class Reflecting {
/**
* Scans object tree connected by annotated fields for a given class using
* reflection and returns found paths.
*
* @param classToScan the class to start scanning in
* @param fieldTypeToFind the type to search for
* @param annotationToScanFor the annotation the fields we should scan are
* annotated with
* @return a list of paths where the given fields have been found
*/
public List getPathsOf(final Class classToScan, final Class fieldTypeToFind,
final Class annotationToScanFor) {
return getPathsOf(classToScan, fieldTypeToFind, annotationToScanFor, "");
}
private List getPathsOf(final Class classToScan, final Class typeToFind,
final Class annotation, final String currentPath) {
List paths = new ArrayList<>();
for (Field field : classToScan.getDeclaredFields()) {
Class currentType = field.getType();
if (field.isAnnotationPresent(annotation)) {
if (typeToFind.isAssignableFrom(currentType)) {
paths.add(currentPath + field.getName());
continue;
}
paths.addAll(getPathsOf(currentType, typeToFind, annotation, currentPath + field.getName() + "."));
}
}
return paths;
}
/**
* Gets the instance of a specific field given by path
*
* @param
* @param path
* @param instanceToSearchIn
* @param annotationToScanFor
* @return
* @throws IllegalArgumentException
* @throws IllegalAccessException
*/
public T getFieldByPath(final String path, final Object instanceToSearchIn,
final Class annotationToScanFor)
throws IllegalArgumentException, IllegalAccessException {
FieldParser p = new FieldParser(path, instanceToSearchIn, annotationToScanFor);
return p.parse();
}
}