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XWork is an command-pattern framework that is used to power WebWork
as well as other applications. XWork provides an Inversion of Control
container, a powerful expression language, data type conversion,
validation, and pluggable configuration.
The newest version!
/*
* Copyright (c) 2002-2006 by OpenSymphony
* All rights reserved.
*/
package com.opensymphony.xwork2.conversion.impl;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ObjectFactory;
import com.opensymphony.xwork2.XWorkMessages;
import com.opensymphony.xwork2.XWorkException;
import com.opensymphony.xwork2.conversion.TypeConverter;
import com.opensymphony.xwork2.conversion.annotations.Conversion;
import com.opensymphony.xwork2.conversion.annotations.ConversionRule;
import com.opensymphony.xwork2.conversion.annotations.ConversionType;
import com.opensymphony.xwork2.conversion.annotations.TypeConversion;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.ognl.XWorkTypeConverterWrapper;
import com.opensymphony.xwork2.util.*;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import com.opensymphony.xwork2.util.reflection.ReflectionContextState;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.*;
/**
* XWorkConverter is a singleton used by many of the Struts 2's Ognl extention points,
* such as InstantiatingNullHandler, XWorkListPropertyAccessor etc to do object
* conversion.
*
*
*
* Type conversion is great for situations where you need to turn a String in to a more complex object. Because the web
* is type-agnostic (everything is a string in HTTP), Struts 2's type conversion features are very useful. For instance,
* if you were prompting a user to enter in coordinates in the form of a string (such as "3, 22"), you could have
* Struts 2 do the conversion both from String to Point and from Point to String.
*
* Using this "point" example, if your action (or another compound object in which you are setting properties on)
* has a corresponding ClassName-conversion.properties file, Struts 2 will use the configured type converters for
* conversion to and from strings. So turning "3, 22" in to new Point(3, 22) is done by merely adding the following
* entry to ClassName-conversion.properties (Note that the PointConverter should impl the TypeConverter
* interface):
*
* point = com.acme.PointConverter
*
* Your type converter should be sure to check what class type it is being requested to convert. Because it is used
* for both to and from strings, you will need to split the conversion method in to two parts: one that turns Strings in
* to Points, and one that turns Points in to Strings.
*
* After this is done, you can now reference your point (using <s:property value="point"/> in JSP or ${point}
* in FreeMarker) and it will be printed as "3, 22" again. As such, if you submit this back to an action, it will be
* converted back to a Point once again.
*
* In some situations you may wish to apply a type converter globally. This can be done by editing the file
* xwork-conversion.properties in the root of your class path (typically WEB-INF/classes) and providing a
* property in the form of the class name of the object you wish to convert on the left hand side and the class name of
* the type converter on the right hand side. For example, providing a type converter for all Point objects would mean
* adding the following entry:
*
* com.acme.Point = com.acme.PointConverter
*
*
*
*
*
*
*
* Type conversion should not be used as a substitute for i18n. It is not recommended to use this feature to print out
* properly formatted dates. Rather, you should use the i18n features of Struts 2 (and consult the JavaDocs for JDK's
* MessageFormat object) to see how a properly formatted date should be displayed.
*
*
*
*
*
*
*
* Any error that occurs during type conversion may or may not wish to be reported. For example, reporting that the
* input "abc" could not be converted to a number might be important. On the other hand, reporting that an empty string,
* "", cannot be converted to a number might not be important - especially in a web environment where it is hard to
* distinguish between a user not entering a value vs. entering a blank value.
*
* By default, all conversion errors are reported using the generic i18n key xwork.default.invalid.fieldvalue,
* which you can override (the default text is Invalid field value for field "xxx", where xxx is the field name)
* in your global i18n resource bundle.
*
* However, sometimes you may wish to override this message on a per-field basis. You can do this by adding an i18n
* key associated with just your action (Action.properties) using the pattern invalid.fieldvalue.xxx, where xxx
* is the field name.
*
* It is important to know that none of these errors are actually reported directly. Rather, they are added to a map
* called conversionErrors in the ActionContext. There are several ways this map can then be accessed and the
* errors can be reported accordingly.
*
*
*
* @author Pat Lightbody
* @author Rainer Hermanns
* @author Alexandru Popescu
* @author tm_jee
* @version $Date: 2009-02-20 16:22:40 +0100 (Fri, 20 Feb 2009) $ $Id: XWorkConverter.java 1924 2009-02-20 15:22:40Z lukasz03 $
* @see XWorkBasicConverter
*/
public class XWorkConverter extends DefaultTypeConverter {
protected static final Logger LOG = LoggerFactory.getLogger(XWorkConverter.class);
public static final String REPORT_CONVERSION_ERRORS = "report.conversion.errors";
public static final String CONVERSION_PROPERTY_FULLNAME = "conversion.property.fullName";
public static final String CONVERSION_ERROR_PROPERTY_PREFIX = "invalid.fieldvalue.";
public static final String CONVERSION_COLLECTION_PREFIX = "Collection_";
public static final String LAST_BEAN_CLASS_ACCESSED = "last.bean.accessed";
public static final String LAST_BEAN_PROPERTY_ACCESSED = "last.property.accessed";
/**
* Target class conversion Mappings.
*
* Map>
* - Class -> convert to class
* - Map
* - String -> property name
* eg. Element_property, property etc.
* - Object -> String to represent properties
* eg. value part of
* KeyProperty_property=id
* -> TypeConverter to represent an Ognl TypeConverter
* eg. value part of
* property=foo.bar.MyConverter
* -> Class to represent a class
* eg. value part of
* Element_property=foo.bar.MyObject
*
*/
protected HashMap> mappings = new HashMap>(); // action
/**
* Unavailable target class conversion mappings, serves as a simple cache.
*/
protected HashSet noMapping = new HashSet(); // action
/**
* Record class and its type converter mapping.
*
* - String - classname as String
* - TypeConverter - instance of TypeConverter
*
*/
protected HashMap defaultMappings = new HashMap(); // non-action (eg. returned value)
/**
* Record classes that doesn't have conversion mapping defined.
*
* - String -> classname as String
*
*/
protected HashSet unknownMappings = new HashSet(); // non-action (eg. returned value)
private TypeConverter defaultTypeConverter;
private ObjectFactory objectFactory;
protected XWorkConverter() {
}
@Inject
public void setObjectFactory(ObjectFactory factory) {
this.objectFactory = factory;
// note: this file is deprecated
loadConversionProperties("xwork-default-conversion.properties");
loadConversionProperties("xwork-conversion.properties");
}
@Inject
public void setDefaultTypeConverter(XWorkBasicConverter conv) {
this.defaultTypeConverter = conv;
}
public static String getConversionErrorMessage(String propertyName, ValueStack stack) {
String defaultMessage = LocalizedTextUtil.findDefaultText(XWorkMessages.DEFAULT_INVALID_FIELDVALUE,
ActionContext.getContext().getLocale(),
new Object[]{
propertyName
});
String getTextExpression = "getText('" + CONVERSION_ERROR_PROPERTY_PREFIX + propertyName + "','" + defaultMessage + "')";
String message = (String) stack.findValue(getTextExpression);
if (message == null) {
message = defaultMessage;
}
return message;
}
public static String buildConverterFilename(Class clazz) {
String className = clazz.getName();
return className.replace('.', '/') + "-conversion.properties";
}
@Override
public Object convertValue(Map map, Object o, Class aClass) {
return convertValue(map, null, null, null, o, aClass);
}
/**
* Convert value from one form to another.
* Minimum requirement of arguments:
*
* - supplying context, toClass and value
* - supplying context, target and value.
*
*
* @see TypeConverter#convertValue(java.util.Map, java.lang.Object, java.lang.reflect.Member, java.lang.String, java.lang.Object, java.lang.Class)
*/
@Override
public Object convertValue(Map context, Object target, Member member, String property, Object value, Class toClass) {
//
// Process the conversion using the default mappings, if one exists
//
TypeConverter tc = null;
if ((value != null) && (toClass == value.getClass())) {
return value;
}
// allow this method to be called without any context
// i.e. it can be called with as little as "Object value" and "Class toClass"
if (target != null) {
Class clazz = target.getClass();
Object[] classProp = null;
// this is to handle weird issues with setValue with a different type
if ((target instanceof CompoundRoot) && (context != null)) {
classProp = getClassProperty(context);
}
if (classProp != null) {
clazz = (Class) classProp[0];
property = (String) classProp[1];
}
tc = (TypeConverter) getConverter(clazz, property);
if (LOG.isDebugEnabled())
LOG.debug("field-level type converter for property [" + property + "] = " + (tc == null ? "none found" : tc));
}
if (tc == null && context != null) {
// ok, let's see if we can look it up by path as requested in XW-297
Object lastPropertyPath = context.get(ReflectionContextState.CURRENT_PROPERTY_PATH);
Class clazz = (Class) context.get(XWorkConverter.LAST_BEAN_CLASS_ACCESSED);
if (lastPropertyPath != null && clazz != null) {
String path = lastPropertyPath + "." + property;
tc = (TypeConverter) getConverter(clazz, path);
}
}
if (tc == null) {
if (toClass.equals(String.class) && (value != null) && !(value.getClass().equals(String.class) || value.getClass().equals(String[].class))) {
// when converting to a string, use the source target's class's converter
tc = lookup(value.getClass());
} else {
// when converting from a string, use the toClass's converter
tc = lookup(toClass);
}
if (LOG.isDebugEnabled())
LOG.debug("global-level type converter for property [" + property + "] = " + (tc == null ? "none found" : tc));
}
if (tc != null) {
try {
return tc.convertValue(context, target, member, property, value, toClass);
} catch (Exception e) {
if (LOG.isDebugEnabled())
LOG.debug("unable to convert value using type converter [#0]", e, tc.getClass().getName());
handleConversionException(context, property, value, target);
return TypeConverter.NO_CONVERSION_POSSIBLE;
}
}
if (defaultTypeConverter != null) {
try {
if (LOG.isDebugEnabled())
LOG.debug("falling back to default type converter [" + defaultTypeConverter + "]");
return defaultTypeConverter.convertValue(context, target, member, property, value, toClass);
} catch (Exception e) {
if (LOG.isDebugEnabled())
LOG.debug("unable to convert value using type converter [#0]", e, defaultTypeConverter.getClass().getName());
handleConversionException(context, property, value, target);
return TypeConverter.NO_CONVERSION_POSSIBLE;
}
} else {
try {
if (LOG.isDebugEnabled())
LOG.debug("falling back to Ognl's default type conversion");
return super.convertValue(value, toClass);
} catch (Exception e) {
if (LOG.isDebugEnabled())
LOG.debug("unable to convert value using type converter [#0]", e, super.getClass().getName());
handleConversionException(context, property, value, target);
return TypeConverter.NO_CONVERSION_POSSIBLE;
}
}
}
/**
* Looks for a TypeConverter in the default mappings.
*
* @param className name of the class the TypeConverter must handle
* @return a TypeConverter to handle the specified class or null if none can be found
*/
public TypeConverter lookup(String className) {
if (unknownMappings.contains(className) && !defaultMappings.containsKey(className)) {
return null;
}
TypeConverter result = defaultMappings.get(className);
//Looks for super classes
if (result == null) {
Class clazz = null;
try {
clazz = Thread.currentThread().getContextClassLoader().loadClass(className);
} catch (ClassNotFoundException cnfe) {
//swallow
}
result = lookupSuper(clazz);
if (result != null) {
//Register now, the next lookup will be faster
registerConverter(className, result);
} else {
// if it isn't found, never look again (also faster)
registerConverterNotFound(className);
}
}
return result;
}
/**
* Looks for a TypeConverter in the default mappings.
*
* @param clazz the class the TypeConverter must handle
* @return a TypeConverter to handle the specified class or null if none can be found
*/
public TypeConverter lookup(Class clazz) {
return lookup(clazz.getName());
}
protected Object getConverter(Class clazz, String property) {
if (LOG.isDebugEnabled()) {
LOG.debug("Property: " + property);
LOG.debug("Class: " + clazz.getName());
}
synchronized (clazz) {
if ((property != null) && !noMapping.contains(clazz)) {
try {
Map mapping = mappings.get(clazz);
if (mapping == null) {
mapping = buildConverterMapping(clazz);
} else {
mapping = conditionalReload(clazz, mapping);
}
Object converter = mapping.get(property);
if (LOG.isDebugEnabled() && converter == null) {
LOG.debug("converter is null for property " + property + ". Mapping size: " + mapping.size());
for (String next : mapping.keySet()) {
LOG.debug(next + ":" + mapping.get(next));
}
}
return converter;
} catch (Throwable t) {
noMapping.add(clazz);
}
}
}
return null;
}
protected void handleConversionException(Map context, String property, Object value, Object object) {
if (context != null && (Boolean.TRUE.equals(context.get(REPORT_CONVERSION_ERRORS)))) {
String realProperty = property;
String fullName = (String) context.get(CONVERSION_PROPERTY_FULLNAME);
if (fullName != null) {
realProperty = fullName;
}
Map conversionErrors = (Map) context.get(ActionContext.CONVERSION_ERRORS);
if (conversionErrors == null) {
conversionErrors = new HashMap();
context.put(ActionContext.CONVERSION_ERRORS, conversionErrors);
}
conversionErrors.put(realProperty, value);
}
}
public synchronized void registerConverter(String className, TypeConverter converter) {
defaultMappings.put(className, converter);
if (unknownMappings.contains(className)) {
unknownMappings.remove(className);
}
}
public synchronized void registerConverterNotFound(String className) {
unknownMappings.add(className);
}
private Object[] getClassProperty(Map context) {
return (Object[]) context.get("__link");
}
/**
* Looks for converter mappings for the specified class and adds it to an existing map. Only new converters are
* added. If a converter is defined on a key that already exists, the converter is ignored.
*
* @param mapping an existing map to add new converter mappings to
* @param clazz class to look for converter mappings for
*/
protected void addConverterMapping(Map mapping, Class clazz) {
try {
String converterFilename = buildConverterFilename(clazz);
InputStream is = FileManager.loadFile(converterFilename, clazz);
if (is != null) {
if (LOG.isDebugEnabled()) {
LOG.debug("processing conversion file [" + converterFilename + "] [class=" + clazz + "]");
}
Properties prop = new Properties();
prop.load(is);
for (Map.Entry entry : prop.entrySet()) {
String key = (String) entry.getKey();
if (mapping.containsKey(key)) {
break;
}
// for keyProperty of Set
if (key.startsWith(DefaultObjectTypeDeterminer.KEY_PROPERTY_PREFIX)
|| key.startsWith(DefaultObjectTypeDeterminer.CREATE_IF_NULL_PREFIX)) {
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + "[treated as String]");
}
mapping.put(key, entry.getValue());
}
//for properties of classes
else if (!(key.startsWith(DefaultObjectTypeDeterminer.ELEMENT_PREFIX) ||
key.startsWith(DefaultObjectTypeDeterminer.KEY_PREFIX) ||
key.startsWith(DefaultObjectTypeDeterminer.DEPRECATED_ELEMENT_PREFIX))
) {
TypeConverter _typeConverter = createTypeConverter((String) entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + "[treated as TypeConverter " + _typeConverter + "]");
}
mapping.put(key, _typeConverter);
}
//for keys of Maps
else if (key.startsWith(DefaultObjectTypeDeterminer.KEY_PREFIX)) {
Class converterClass = Thread.currentThread().getContextClassLoader().loadClass((String) entry.getValue());
//check if the converter is a type converter if it is one
//then just put it in the map as is. Otherwise
//put a value in for the type converter of the class
if (converterClass.isAssignableFrom(TypeConverter.class)) {
TypeConverter _typeConverter = createTypeConverter((String) entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + "[treated as TypeConverter " + _typeConverter + "]");
}
mapping.put(key, _typeConverter);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + "[treated as Class " + converterClass + "]");
}
mapping.put(key, converterClass);
}
}
//elements(values) of maps / lists
else {
Class _c = Thread.currentThread().getContextClassLoader().loadClass((String) entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + "[treated as Class " + _c + "]");
}
mapping.put(key, _c);
}
}
}
} catch (Exception ex) {
LOG.error("Problem loading properties for " + clazz.getName(), ex);
}
// Process annotations
Annotation[] annotations = clazz.getAnnotations();
for (Annotation annotation : annotations) {
if (annotation instanceof Conversion) {
Conversion conversion = (Conversion) annotation;
for (TypeConversion tc : conversion.conversions()) {
String key = tc.key();
if (mapping.containsKey(key)) {
break;
}
if (LOG.isDebugEnabled()) {
LOG.debug(key + ":" + key);
}
if (key != null) {
try {
if (tc.type() == ConversionType.APPLICATION) {
defaultMappings.put(key, createTypeConverter(tc.converter()));
} else {
if (tc.rule().toString().equals(ConversionRule.KEY_PROPERTY) || tc.rule().toString().equals(ConversionRule.CREATE_IF_NULL)) {
mapping.put(key, tc.value());
}
//for properties of classes
else if (!(tc.rule().toString().equals(ConversionRule.ELEMENT.toString())) ||
tc.rule().toString().equals(ConversionRule.KEY.toString()) ||
tc.rule().toString().equals(ConversionRule.COLLECTION.toString())
) {
mapping.put(key, createTypeConverter(tc.converter()));
}
//for keys of Maps
else if (tc.rule().toString().equals(ConversionRule.KEY.toString())) {
Class converterClass = Thread.currentThread().getContextClassLoader().loadClass(tc.converter());
if (LOG.isDebugEnabled()) {
LOG.debug("Converter class: " + converterClass);
}
//check if the converter is a type converter if it is one
//then just put it in the map as is. Otherwise
//put a value in for the type converter of the class
if (converterClass.isAssignableFrom(TypeConverter.class)) {
mapping.put(key, createTypeConverter(tc.converter()));
} else {
mapping.put(key, converterClass);
if (LOG.isDebugEnabled()) {
LOG.debug("Object placed in mapping for key "
+ key
+ " is "
+ mapping.get(key));
}
}
}
//elements(values) of maps / lists
else {
mapping.put(key, Thread.currentThread().getContextClassLoader().loadClass(tc.converter()));
}
}
} catch (Exception e) {
}
}
}
}
}
Method[] methods = clazz.getMethods();
for (Method method : methods) {
annotations = method.getAnnotations();
for (Annotation annotation : annotations) {
if (annotation instanceof TypeConversion) {
TypeConversion tc = (TypeConversion) annotation;
String key = tc.key();
if (mapping.containsKey(key)) {
break;
}
// Default to the property name
if (key != null && key.length() == 0) {
key = AnnotationUtils.resolvePropertyName(method);
LOG.debug("key from method name... " + key + " - " + method.getName());
}
if (LOG.isDebugEnabled()) {
LOG.debug(key + ":" + key);
}
if (key != null) {
try {
if (tc.type() == ConversionType.APPLICATION) {
defaultMappings.put(key, createTypeConverter(tc.converter()));
} else {
if (tc.rule().toString().equals(ConversionRule.KEY_PROPERTY)) {
mapping.put(key, tc.value());
}
//for properties of classes
else if (!(tc.rule().toString().equals(ConversionRule.ELEMENT.toString())) ||
tc.rule().toString().equals(ConversionRule.KEY.toString()) ||
tc.rule().toString().equals(ConversionRule.COLLECTION.toString())
) {
mapping.put(key, createTypeConverter(tc.converter()));
}
//for keys of Maps
else if (tc.rule().toString().equals(ConversionRule.KEY.toString())) {
Class converterClass = Thread.currentThread().getContextClassLoader().loadClass(tc.converter());
if (LOG.isDebugEnabled()) {
LOG.debug("Converter class: " + converterClass);
}
//check if the converter is a type converter if it is one
//then just put it in the map as is. Otherwise
//put a value in for the type converter of the class
if (converterClass.isAssignableFrom(TypeConverter.class)) {
mapping.put(key, createTypeConverter(tc.converter()));
} else {
mapping.put(key, converterClass);
if (LOG.isDebugEnabled()) {
LOG.debug("Object placed in mapping for key "
+ key
+ " is "
+ mapping.get(key));
}
}
}
//elements(values) of maps / lists
else {
mapping.put(key, Thread.currentThread().getContextClassLoader().loadClass(tc.converter()));
}
}
} catch (Exception e) {
}
}
}
}
}
}
/**
* Looks for converter mappings for the specified class, traversing up its class hierarchy and interfaces and adding
* any additional mappings it may find. Mappings lower in the hierarchy have priority over those higher in the
* hierarcy.
*
* @param clazz the class to look for converter mappings for
* @return the converter mappings
*/
protected Map buildConverterMapping(Class clazz) throws Exception {
Map mapping = new HashMap();
// check for conversion mapping associated with super classes and any implemented interfaces
Class curClazz = clazz;
while (!curClazz.equals(Object.class)) {
// add current class' mappings
addConverterMapping(mapping, curClazz);
// check interfaces' mappings
Class[] interfaces = curClazz.getInterfaces();
for (Class anInterface : interfaces) {
addConverterMapping(mapping, anInterface);
}
curClazz = curClazz.getSuperclass();
}
if (mapping.size() > 0) {
mappings.put(clazz, mapping);
} else {
noMapping.add(clazz);
}
return mapping;
}
private Map conditionalReload(Class clazz, Map oldValues) throws Exception {
Map mapping = oldValues;
if (FileManager.isReloadingConfigs()) {
if (FileManager.fileNeedsReloading(buildConverterFilename(clazz), clazz)) {
mapping = buildConverterMapping(clazz);
}
}
return mapping;
}
TypeConverter createTypeConverter(String className) throws Exception {
// type converters are used across users
Object obj = objectFactory.buildBean(className, null);
if (obj instanceof TypeConverter) {
return (TypeConverter) obj;
// For backwards compatibility
} else if (obj instanceof ognl.TypeConverter) {
return new XWorkTypeConverterWrapper((ognl.TypeConverter) obj);
} else {
throw new IllegalArgumentException("Type converter class " + obj.getClass() + " doesn't implement com.opensymphony.xwork2.conversion.TypeConverter");
}
}
public void loadConversionProperties(String propsName) {
loadConversionProperties(propsName, false);
}
public void loadConversionProperties(String propsName, boolean require) {
try {
Iterator resources = ClassLoaderUtil.getResources(propsName, getClass(), true);
while (resources.hasNext()) {
URL url = resources.next();
Properties props = new Properties();
props.load(url.openStream());
if (LOG.isDebugEnabled()) {
LOG.debug("processing conversion file [" + propsName + "]");
}
for (Object o : props.entrySet()) {
Map.Entry entry = (Map.Entry) o;
String key = (String) entry.getKey();
try {
TypeConverter _typeConverter = createTypeConverter((String) entry.getValue());
if (LOG.isDebugEnabled()) {
LOG.debug("\t" + key + ":" + entry.getValue() + " [treated as TypeConverter " + _typeConverter + "]");
}
defaultMappings.put(key, _typeConverter);
} catch (Exception e) {
LOG.error("Conversion registration error", e);
}
}
}
} catch (IOException ex) {
if (require) {
throw new XWorkException("Cannot load conversion properties file: "+propsName, ex);
} else {
LOG.debug("Cannot load conversion properties file: "+propsName, ex);
}
}
}
/**
* Recurses through a class' interfaces and class hierarchy looking for a TypeConverter in the default mapping that
* can handle the specified class.
*
* @param clazz the class the TypeConverter must handle
* @return a TypeConverter to handle the specified class or null if none can be found
*/
TypeConverter lookupSuper(Class clazz) {
TypeConverter result = null;
if (clazz != null) {
result = defaultMappings.get(clazz.getName());
if (result == null) {
// Looks for direct interfaces (depth = 1 )
Class[] interfaces = clazz.getInterfaces();
for (Class anInterface : interfaces) {
if (defaultMappings.containsKey(anInterface.getName())) {
result = (TypeConverter) defaultMappings.get(anInterface.getName());
break;
}
}
if (result == null) {
// Looks for the superclass
// If 'clazz' is the Object class, an interface, a primitive type or void then clazz.getSuperClass() returns null
result = lookupSuper(clazz.getSuperclass());
}
}
}
return result;
}
}