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Java client for Appium Mobile Webdriver
/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership.
* 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 io.appium.java_client.proxy;
import com.google.common.base.Preconditions;
import net.bytebuddy.ByteBuddy;
import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
import net.bytebuddy.implementation.MethodDelegation;
import net.bytebuddy.matcher.ElementMatchers;
import java.util.Collection;
import java.util.Collections;
public class Helpers {
private Helpers() {
}
/**
* Creates a transparent proxy instance for the given class.
* It is possible to provide one or more method execution listeners
* or replace particular method calls completely. Callbacks
* defined in these listeners are going to be called when any
* **public** method of the given class is invoked. Overridden callbacks
* are expected to be skipped if they throw
* {@link io.appium.java_client.proxy.NotImplementedException}.
*
* @param cls the class to which the proxy should be created.
* Must not be an interface.
* @param constructorArgs Array of constructor arguments. Could be an
* empty array if the class provides a constructor without arguments.
* @param constructorArgTypes Array of constructor argument types. Must
* represent types of constructorArgs.
* @param listeners One or more method invocation listeners.
* @param Any class derived from Object
* @return Proxy instance
*/
public static T createProxy(
Class cls,
Object[] constructorArgs,
Class[] constructorArgTypes,
Collection listeners
) {
Preconditions.checkArgument(constructorArgs.length == constructorArgTypes.length,
String.format(
"Constructor arguments array length %d must be equal to the types array length %d",
constructorArgs.length, constructorArgTypes.length
)
);
Preconditions.checkArgument(!listeners.isEmpty(), "The collection of listeners must not be empty");
Preconditions.checkArgument(cls != null, "Class must not be null");
Preconditions.checkArgument(!cls.isInterface(), "Class must not be an interface");
//noinspection resource
Class proxy = new ByteBuddy()
.subclass(cls)
.method(ElementMatchers.isPublic()
.and(ElementMatchers.not(
ElementMatchers.isDeclaredBy(Object.class)
.or(ElementMatchers.isOverriddenFrom(Object.class))
)))
.intercept(MethodDelegation.to(Interceptor.class))
.make()
.load(cls.getClassLoader(), ClassLoadingStrategy.Default.WRAPPER)
.getLoaded()
.asSubclass(cls);
try {
//noinspection unchecked
T instance = (T) proxy
.getConstructor(constructorArgTypes)
.newInstance(constructorArgs);
Interceptor.LISTENERS.put(instance, listeners);
return instance;
} catch (SecurityException | ReflectiveOperationException e) {
throw new IllegalStateException(String.format("Unable to create a proxy of %s", cls.getName()), e);
}
}
/**
* Creates a transparent proxy instance for the given class.
* It is possible to provide one or more method execution listeners
* or replace particular method calls completely. Callbacks
* defined in these listeners are going to be called when any
* **public** method of the given class is invoked. Overridden callbacks
* are expected to be skipped if they throw NotImplementedException.
*
* @param cls the class to which the proxy should be created.
* Must not be an interface. Must expose a constructor
* without arguments.
* @param listeners One or more method invocation listeners.
* @param Any class derived from Object
* @return Proxy instance
*/
public static T createProxy(Class cls, Collection listeners) {
return createProxy(cls, new Object[]{}, new Class[]{}, listeners);
}
/**
* Creates a transparent proxy instance for the given class.
* It is possible to provide one or more method execution listeners
* or replace particular method calls completely. Callbacks
* defined in these listeners are going to be called when any
* **public** method of the given class is invoked. Overridden callbacks
* are expected to be skipped if they throw NotImplementedException.
*
* @param cls the class to which the proxy should be created.
* Must not be an interface. Must expose a constructor
* without arguments.
* @param listener Method invocation listener.
* @param Any class derived from Object
* @return Proxy instance
*/
public static T createProxy(Class cls, MethodCallListener listener) {
return createProxy(cls, new Object[]{}, new Class[]{}, Collections.singletonList(listener));
}
/**
* Creates a transparent proxy instance for the given class.
* It is possible to provide one or more method execution listeners
* or replace particular method calls completely. Callbacks
* defined in these listeners are going to be called when any
* **public** method of the given class is invoked. Overridden callbacks
* are expected to be skipped if they throw NotImplementedException.
*
* @param cls the class to which the proxy should be created.
* Must not be an interface.
* @param constructorArgs Array of constructor arguments. Could be an
* empty array if the class provides a constructor without arguments.
* @param constructorArgTypes Array of constructor argument types. Must
* represent types of constructorArgs.
* @param listener Method invocation listener.
* @param Any class derived from Object
* @return Proxy instance
*/
public static T createProxy(
Class cls,
Object[] constructorArgs,
Class[] constructorArgTypes,
MethodCallListener listener
) {
return createProxy(cls, constructorArgs, constructorArgTypes, Collections.singletonList(listener));
}
}