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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The SFC licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package org.openqa.selenium.remote;
import static net.bytebuddy.matcher.ElementMatchers.any;
import static net.bytebuddy.matcher.ElementMatchers.named;
import com.google.common.collect.ImmutableList;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.description.annotation.AnnotationDescription;
import net.bytebuddy.implementation.FixedValue;
import net.bytebuddy.implementation.InvocationHandlerAdapter;
import org.openqa.selenium.WebDriver;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;
/**
* Enhance the interfaces implemented by an instance of the
* {@link org.openqa.selenium.remote.RemoteWebDriver} based on the returned
* {@link org.openqa.selenium.Capabilities} of the driver.
*
* Note: this class is still experimental. Use at your own risk.
*/
public class Augmenter extends BaseAugmenter {
private static final Logger logger = Logger.getLogger(Augmenter.class.getName());
@Override
protected X create(
RemoteWebDriver driver,
Map augmentors,
X objectToAugment) {
CompoundHandler handler = determineAugmentation(driver, augmentors, objectToAugment);
X augmented = performAugmentation(handler, objectToAugment);
copyFields(objectToAugment.getClass(), objectToAugment, augmented);
return augmented;
}
@Override
protected RemoteWebDriver extractRemoteWebDriver(WebDriver driver) {
if (driver.getClass().isAnnotationPresent(Augmentable.class)) {
return (RemoteWebDriver) driver;
}
logger.warning("Augmenter should be applied to the instances of @Augmentable classes " +
"or previously augmented instances only (instance class was: " + driver.getClass() + ")");
return null;
}
private void copyFields(Class clazz, Object source, Object target) {
if (Object.class.equals(clazz)) {
// Stop!
return;
}
for (Field field : clazz.getDeclaredFields()) {
copyField(source, target, field);
}
copyFields(clazz.getSuperclass(), source, target);
}
private void copyField(Object source, Object target, Field field) {
if (Modifier.isFinal(field.getModifiers())) {
return;
}
try {
field.setAccessible(true);
Object value = field.get(source);
field.set(target, value);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
private CompoundHandler determineAugmentation(
RemoteWebDriver driver,
Map augmentors,
Object objectToAugment) {
Map capabilities = driver.getCapabilities().asMap();
CompoundHandler handler = new CompoundHandler(driver, objectToAugment);
for (Map.Entry capabilityName : capabilities.entrySet()) {
AugmenterProvider augmenter = augmentors.get(capabilityName.getKey());
if (augmenter == null) {
continue;
}
Object value = capabilityName.getValue();
if (value instanceof Boolean && !((Boolean) value)) {
continue;
}
handler.addCapabilityHander(augmenter.getDescribedInterface(),
augmenter.getImplementation(value));
}
return handler;
}
@SuppressWarnings({"unchecked"})
protected X performAugmentation(CompoundHandler handler, X from) {
if (handler.isNeedingApplication()) {
Class superClass = from.getClass();
Class loaded = new ByteBuddy()
.subclass(superClass)
.implement(ImmutableList.copyOf(handler.getInterfaces()))
.annotateType(AnnotationDescription.Builder.ofType(Augmentable.class).build())
.method(any()).intercept(InvocationHandlerAdapter.of(handler))
.method(named("isAugmented")).intercept(FixedValue.value(true))
.make()
.load(superClass.getClassLoader())
.getLoaded()
.asSubclass(from.getClass());
try {
return (X) loaded.newInstance();
} catch (ReflectiveOperationException e) {
throw new RuntimeException("Unable to create subclass", e);
}
}
return from;
}
private class CompoundHandler implements InvocationHandler {
private final ExecuteMethod execute;
private final Object originalInstance;
private final Map handlers = new HashMap<>();
private final Set> interfaces = new HashSet<>();
private CompoundHandler(RemoteWebDriver driver, Object originalInstance) {
this.execute = new RemoteExecuteMethod(driver);
this.originalInstance = originalInstance;
}
void addCapabilityHander(Class fromInterface, InterfaceImplementation handledBy) {
if (fromInterface.isInterface()) {
interfaces.add(fromInterface);
}
for (Method method : fromInterface.getDeclaredMethods()) {
handlers.put(method, handledBy);
}
}
Set> getInterfaces() {
return interfaces;
}
boolean isNeedingApplication() {
return !handlers.isEmpty();
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
InterfaceImplementation handler = handlers.get(method);
if (handler == null) {
try {
return method.invoke(originalInstance, args);
} catch (InvocationTargetException e) {
throw e.getTargetException();
}
}
return handler.invoke(execute, proxy, method, args);
}
}
}