de.escalon.hypermedia.affordance.BeanUtil Maven / Gradle / Ivy
package de.escalon.hypermedia.affordance;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Bean related utitility methods Created by Dietrich on 05.12.2015.
*/
public class BeanUtil {
private static Logger LOG = LoggerFactory.getLogger(BeanUtil.class);
private BeanUtil() {
// prevent instantiation
}
/**
* Recursively build list of property paths for bean.
*
* @param clazz
* of bean
* @return property paths
*/
public static List getPropertyPaths(Class clazz) {
return addClassPropertyPaths(new ArrayList(), "", clazz);
}
private static List addClassPropertyPaths(List ret, String currentPath, Class clazz) {
PropertyDescriptor[] propertyDescriptors = getPropertyDescriptors(clazz);
for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
addPropertyPaths(ret, currentPath, propertyDescriptor);
}
return ret;
}
private static List addPropertyPaths(List ret, String currentPath, PropertyDescriptor
propertyDescriptor) {
String propertyName = propertyDescriptor.getName();
if ("class".equals(propertyName)) {
return Collections.emptyList();
}
Class propertyType = propertyDescriptor.getPropertyType();
if (DataType.isSingleValueType(propertyType)) {
if (!currentPath.isEmpty()) {
currentPath += ".";
}
ret.add(currentPath + propertyName);
} else if (DataType.isArrayOrCollection(propertyType)) {
LOG.warn((currentPath.isEmpty() ? currentPath : currentPath + ".")
+ propertyName + ": property paths for collections not supported yet");
// TODO support for collection properties
} else {
currentPath += propertyName;
addClassPropertyPaths(ret, currentPath, propertyType);
}
return ret;
}
private static PropertyDescriptor[] getPropertyDescriptors(Class clazz) {
try {
BeanInfo info = Introspector.getBeanInfo(clazz);
return info.getPropertyDescriptors();
} catch (IntrospectionException e) {
throw new RuntimeException(e);
}
}
}