org.wildfly.clustering.marshalling.protostream.reflect.Reflect Maven / Gradle / Ivy
/*
* Copyright The WildFly Authors
* SPDX-License-Identifier: Apache-2.0
*/
package org.wildfly.clustering.marshalling.protostream.reflect;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.LinkedList;
import java.util.List;
/**
* Utility methods requiring privileged actions for use by reflection-based marshallers.
* Do not change class/method visibility to avoid being called from other {@link java.security.CodeSource}s, thus granting privilege escalation to external code.
* @author Paul Ferraro
*/
final class Reflect {
static Field findField(Class sourceClass, Class fieldType) {
List assignableFields = new LinkedList<>();
Field[] fields = sourceClass.getDeclaredFields();
// Try first with precise type checking
for (Field field : fields) {
Class type = field.getType();
if (!Modifier.isStatic(field.getModifiers()) && (type == fieldType)) {
assignableFields.add(field);
}
}
// Retry with relaxed type checking, if necessary
if (assignableFields.isEmpty()) {
for (Field field : fields) {
Class type = field.getType();
if (!Modifier.isStatic(field.getModifiers()) && (type != Object.class) && type.isAssignableFrom(fieldType)) {
assignableFields.add(field);
}
}
}
// We should not have matched more than 1 field
if (assignableFields.size() > 1) {
throw new IllegalStateException(assignableFields.toString());
}
if (!assignableFields.isEmpty()) {
Field field = assignableFields.get(0);
field.setAccessible(true);
return field;
}
Class superClass = sourceClass.getSuperclass();
if ((superClass == null) || (superClass == Object.class)) {
throw new IllegalArgumentException(fieldType.getName());
}
return findField(superClass, fieldType);
}
static Method findMethod(Class sourceClass, Class returnType) {
List matchingMethods = new LinkedList<>();
for (Method method : sourceClass.getDeclaredMethods()) {
if (!Modifier.isStatic(method.getModifiers()) && (method.getParameterCount() == 0) && (method.getReturnType() == returnType)) {
matchingMethods.add(method);
}
}
// We should not have matched more than 1 method
if (matchingMethods.size() > 1) {
throw new IllegalStateException(matchingMethods.toString());
}
if (!matchingMethods.isEmpty()) {
Method method = matchingMethods.get(0);
method.setAccessible(true);
return method;
}
Class superClass = sourceClass.getSuperclass();
if ((superClass == null) || (superClass == Object.class)) {
throw new IllegalArgumentException(returnType.getName());
}
return findMethod(superClass, returnType);
}
static Method findMethod(Class sourceClass, String methodName) {
try {
Method method = sourceClass.getDeclaredMethod(methodName);
method.setAccessible(true);
return method;
} catch (NoSuchMethodException e) {
throw new IllegalStateException(e);
}
}
static Constructor getConstructor(Class sourceClass, Class... parameterTypes) {
try {
Constructor constructor = sourceClass.getDeclaredConstructor(parameterTypes);
constructor.setAccessible(true);
return constructor;
} catch (NoSuchMethodException e) {
throw new IllegalStateException(e);
}
}
static T newInstance(Constructor constructor, Object... parameters) {
try {
return constructor.newInstance(parameters);
} catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
throw new IllegalStateException(e);
}
}
static Object getValue(Object source, Field field) {
return getValue(source, field, Object.class);
}
static T getValue(Object source, Field field, Class fieldType) {
try {
return fieldType.cast(field.get(source));
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
static void setValue(Object source, Field field, Object value) {
try {
field.set(source, value);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
}
static Object invoke(Object source, Method method) {
return invoke(source, method, Object.class);
}
static T invoke(Object source, Method method, Class returnClass) {
try {
return returnClass.cast(method.invoke(source));
} catch (IllegalAccessException | InvocationTargetException e) {
throw new IllegalStateException(e);
}
}
}