com.fitbur.glassfish.hk2.utilities.reflection.internal.ClassReflectionHelperImpl Maven / Gradle / Ivy
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package com.fitbur.glassfish.hk2.utilities.reflection.internal;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import com.fitbur.glassfish.hk2.utilities.reflection.ClassReflectionHelper;
import com.fitbur.glassfish.hk2.utilities.reflection.MethodWrapper;
import com.fitbur.glassfish.hk2.utilities.reflection.Pretty;
/**
* @author jwells
*
*/
public class ClassReflectionHelperImpl implements ClassReflectionHelper {
private final static String CONVENTION_POST_CONSTRUCT = "postConstruct";
private final static String CONVENTION_PRE_DESTROY = "preDestroy";
private final static Set OBJECT_METHODS = getObjectMethods();
private final static Set OBJECT_FIELDS = getObjectFields();
private final ConcurrentHashMap, MethodPresentValue> postConstructCache =
new ConcurrentHashMap, MethodPresentValue>();
private final ConcurrentHashMap, MethodPresentValue> preDestroyCache =
new ConcurrentHashMap, MethodPresentValue>();
private final ConcurrentHashMap, Set> methodCache =
new ConcurrentHashMap, Set>();
private final ConcurrentHashMap, Set> fieldCache =
new ConcurrentHashMap, Set>();
private static Set getObjectMethods() {
return AccessController.doPrivileged(new PrivilegedAction>() {
@Override
public Set run() {
Set retVal = new HashSet();
for (Method method : Object.class.getDeclaredMethods()) {
retVal.add(new MethodWrapperImpl(method));
}
return retVal;
}
});
}
private static Set getObjectFields() {
return AccessController.doPrivileged(new PrivilegedAction>() {
@Override
public Set run() {
Set retVal = new HashSet();
for (Field field : Object.class.getDeclaredFields()) {
retVal.add(field);
}
return retVal;
}
});
}
private static Method[] secureGetDeclaredMethods(final Class clazz) {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Method[] run() {
return clazz.getDeclaredMethods();
}
});
}
private static Field[] secureGetDeclaredFields(final Class clazz) {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public Field[] run() {
return clazz.getDeclaredFields();
}
});
}
/**
* Gets the EXACT set of MethodWrappers on this class only. No subclasses. So
* this set should be considered RAW and has not taken into account any subclasses
*
* @param clazz The class to examine
* @return
*/
private Set getDeclaredMethodWrappers(final Class clazz) {
Method com.fitburclaredMethods[] = secureGetDeclaredMethods(clazz);
Set retVal = new HashSet();
for (Method method : com.fitburclaredMethods) {
retVal.add(new MethodWrapperImpl(method));
// Since postConstruct and preDestroy are top down it is fine to fill in the cache here.
// In other words if this class has a direct postConstruct/preDestroy then it is the method
// that should win. Hence we can often pre-populate the cache here
if ((isPostConstruct(method) || isPreDestroy(method)) && (method.getParameterTypes().length == 0)) {
if (isPostConstruct(method) && !postConstructCache.containsKey(clazz)) {
postConstructCache.putIfAbsent(clazz, new MethodPresentValue(method));
}
if (isPreDestroy(method) && !preDestroyCache.containsKey(clazz)) {
preDestroyCache.putIfAbsent(clazz, new MethodPresentValue(method));
}
}
}
return retVal;
}
/**
* Gets the EXACT set of FieldWrappers on this class only. No subclasses. So
* this set should be considered RAW and has not taken into account any subclasses
*
* @param clazz The class to examine
* @return
*/
private static Set getDeclaredFieldWrappers(final Class clazz) {
Field com.fitburclaredFields[] = secureGetDeclaredFields(clazz);
Set retVal = new HashSet();
for (Field field : com.fitburclaredFields) {
retVal.add(field);
}
return retVal;
}
public Set getAllFieldWrappers(Class clazz) {
if (clazz == null) return Collections.emptySet();
if (Object.class.equals(clazz)) return OBJECT_FIELDS;
Set retVal = fieldCache.get(clazz);
if (retVal != null) {
return retVal;
}
retVal = new HashSet();
retVal.addAll(getDeclaredFieldWrappers(clazz));
retVal.addAll(getAllFieldWrappers(clazz.getSuperclass()));
fieldCache.putIfAbsent(clazz, retVal);
return retVal;
}
public Set getAllMethodWrappers(Class clazz) {
if (clazz == null) return Collections.emptySet();
if (Object.class.equals(clazz)) return OBJECT_METHODS;
Set retVal = methodCache.get(clazz);
if (retVal != null) {
return retVal;
}
retVal = new HashSet();
retVal.addAll(getDeclaredMethodWrappers(clazz));
retVal.addAll(getAllMethodWrappers(clazz.getSuperclass()));
methodCache.putIfAbsent(clazz, retVal);
return retVal;
}
private static boolean isPostConstruct(Method m) {
if (m.isAnnotationPresent(PostConstruct.class)) return true;
if (m.getParameterTypes().length != 0) return false;
return CONVENTION_POST_CONSTRUCT.equals(m.getName());
}
private static boolean isPreDestroy(Method m) {
if (m.isAnnotationPresent(PreDestroy.class)) return true;
if (m.getParameterTypes().length != 0) return false;
return CONVENTION_PRE_DESTROY.equals(m.getName());
}
/* (non-Javadoc)
* @see com.fitbur.glassfish.hk2.utilities.reflection.ClassReflectionHelper#getAllMethods(java.lang.Class)
*/
@Override
public Set getAllMethods(final Class clazz) {
return getAllMethodWrappers(clazz);
}
@Override
public Set getAllFields(final Class clazz) {
return getAllFieldWrappers(clazz);
}
private Method getPostConstructMethod(Class clazz) {
if (clazz == null || Object.class.equals(clazz)) return null;
MethodPresentValue cachedValue = postConstructCache.get(clazz);
if (cachedValue != null) {
if (!cachedValue.isPresent()) {
return null;
}
Method retVal = cachedValue.getMethod();
if (retVal != null) {
return retVal;
}
}
Method retVal = null;
for (Method m : secureGetDeclaredMethods(clazz)) {
if (isPostConstruct(m)) {
retVal = m;
break;
}
}
if (retVal == null) {
retVal = getPostConstructMethod(clazz.getSuperclass());
}
if (retVal != null && retVal.getParameterTypes().length != 0) {
// We do not cache fails
throw new IllegalArgumentException("The method " + Pretty.method(retVal) +
" annotated with @PostConstruct must not have any arguments");
}
postConstructCache.putIfAbsent(clazz, new MethodPresentValue(retVal));
return retVal;
}
private Method getPreDestroyMethod(Class clazz) {
if (clazz == null || Object.class.equals(clazz)) return null;
MethodPresentValue cachedValue = preDestroyCache.get(clazz);
if (cachedValue != null) {
if (!cachedValue.isPresent()) {
return null;
}
Method retVal = cachedValue.getMethod();
if (retVal != null) {
return retVal;
}
}
Method retVal = null;
for (Method m : secureGetDeclaredMethods(clazz)) {
if (isPreDestroy(m)) {
retVal = m;
break;
}
}
if (retVal == null) {
retVal = getPreDestroyMethod(clazz.getSuperclass());
}
if (retVal != null && retVal.getParameterTypes().length != 0) {
// We do not cache fails
throw new IllegalArgumentException("The method " + Pretty.method(retVal) +
" annotated with @PreDestroy must not have any arguments");
}
preDestroyCache.put(clazz, new MethodPresentValue(retVal));
return retVal;
}
@Override
public Method findPostConstruct(final Class clazz, Class matchingClass)
throws IllegalArgumentException {
MethodPresentValue cachedValue = postConstructCache.get(clazz);
if (cachedValue != null) {
if (!cachedValue.isPresent()) {
return null;
}
Method retVal = cachedValue.getMethod();
if (retVal != null) {
return retVal;
}
}
if (matchingClass.isAssignableFrom(clazz)) {
// A little performance optimization
Method retVal;
try {
retVal = clazz.getMethod(CONVENTION_POST_CONSTRUCT, new Class[0]);
}
catch (NoSuchMethodException e) {
retVal = null;
}
postConstructCache.put(clazz, new MethodPresentValue(retVal));
}
return getPostConstructMethod(clazz);
}
@Override
public Method findPreDestroy(final Class clazz, Class matchingClass)
throws IllegalArgumentException {
MethodPresentValue cachedValue = preDestroyCache.get(clazz);
if (cachedValue != null) {
if (!cachedValue.isPresent()) {
return null;
}
Method retVal = cachedValue.getMethod();
if (retVal != null) {
return retVal;
}
}
if (matchingClass.isAssignableFrom(clazz)) {
// A little performance optimization
Method retVal;
try {
retVal = clazz.getMethod(CONVENTION_PRE_DESTROY, new Class[0]);
}
catch (NoSuchMethodException e) {
retVal = null;
}
preDestroyCache.put(clazz, new MethodPresentValue(retVal));
}
return getPreDestroyMethod(clazz);
}
private static class MethodPresentValue {
private final Method method;
private MethodPresentValue(Method method) {
this.method = method;
}
private boolean isPresent() {
return method != null;
}
private Method getMethod() {
return method;
}
}
@Override
public void clean(Class clazz) {
while ((clazz != null) && !Object.class.equals(clazz)) {
postConstructCache.remove(clazz);
preDestroyCache.remove(clazz);
methodCache.remove(clazz);
fieldCache.remove(clazz);
clazz = clazz.getSuperclass();
}
}
@Override
public void dispose() {
postConstructCache.clear();
preDestroyCache.clear();
methodCache.clear();
fieldCache.clear();
}
@Override
public String toString() {
return "ClassReflectionHelperImpl(" + System.identityHashCode(this) + ")";
}
}
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