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/*
* Copyright 2014 Open Networking Laboratory
*
* Licensed 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.onlab.junit;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* Utilities for testing.
*/
public final class TestUtils {
/**
* Sets the field, bypassing scope restriction.
*
* @param subject Object where the field belongs
* @param fieldName name of the field to set
* @param value value to set to the field.
* @param <T> subject type
* @param <U> value type
* @throws TestUtilsException if there are reflection errors while setting
* the field
*/
public static <T, U> void setField(T subject, String fieldName, U value)
throws TestUtilsException {
@SuppressWarnings("unchecked")
Class clazz = subject.getClass();
try {
while (clazz != null) {
try {
Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
field.set(subject, value);
break;
} catch (NoSuchFieldException ex) {
if (clazz == clazz.getSuperclass()) {
break;
}
clazz = clazz.getSuperclass();
}
}
} catch (SecurityException | IllegalArgumentException |
IllegalAccessException e) {
throw new TestUtilsException("setField failed", e);
}
}
/**
* Gets the field, bypassing scope restriction.
*
* @param subject Object where the field belongs
* @param fieldName name of the field to get
* @param <T> subject type
* @param <U> fieldO value type
* @return value of the field.
* @throws TestUtilsException if there are reflection errors while getting
* the field
*/
public static <T, U> U getField(T subject, String fieldName)
throws TestUtilsException {
try {
NoSuchFieldException exception = null;
@SuppressWarnings("unchecked")
Class clazz = subject.getClass();
while (clazz != null) {
try {
Field field = clazz.getDeclaredField(fieldName);
field.setAccessible(true);
@SuppressWarnings("unchecked")
U result = (U) field.get(subject);
return result;
} catch (NoSuchFieldException e) {
exception = e;
if (clazz == clazz.getSuperclass()) {
break;
}
clazz = clazz.getSuperclass();
}
}
throw new TestUtilsException("Field not found. " + fieldName, exception);
} catch (SecurityException |
IllegalArgumentException | IllegalAccessException e) {
throw new TestUtilsException("getField failed", e);
}
}
/**
* Calls the method, bypassing scope restriction.
*
* @param subject Object where the method belongs
* @param methodName name of the method to call
* @param paramTypes formal parameter type array
* @param args arguments
* @return return value or null if void
* @param <T> subject type
* @param <U> return value type
* @throws TestUtilsException if there are reflection errors while calling
* the method
*/
public static <T, U> U callMethod(T subject, String methodName,
Class<?>[] paramTypes, Object...args) throws TestUtilsException {
try {
@SuppressWarnings("unchecked")
Class<T> clazz = (Class<T>) subject.getClass();
final Method method;
if (paramTypes == null || paramTypes.length == 0) {
method = clazz.getDeclaredMethod(methodName);
} else {
method = clazz.getDeclaredMethod(methodName, paramTypes);
}
method.setAccessible(true);
@SuppressWarnings("unchecked")
U result = (U) method.invoke(subject, args);
return result;
} catch (NoSuchMethodException | SecurityException |
IllegalAccessException | IllegalArgumentException |
InvocationTargetException e) {
throw new TestUtilsException("callMethod failed", e);
}
}
/**
* Calls the method, bypassing scope restriction.
*
* @param subject Object where the method belongs
* @param methodName name of the method to call
* @param paramType formal parameter type
* @param arg argument
* @return return value or null if void
* @param <T> subject type
* @param <U> return value type
* @throws TestUtilsException if there are reflection errors while calling
* the method
*/
public static <T, U> U callMethod(T subject, String methodName,
Class<?> paramType, Object arg) throws TestUtilsException {
return callMethod(subject, methodName, new Class<?>[]{paramType}, arg);
}
/**
* Triggers an allocation of an object of type T and forces a call to
* the private constructor.
*
* @param constructor Constructor to call
* @param <T> type of the object to create
* @return created object of type T
* @throws TestUtilsException if there are reflection errors while calling
* the constructor
*/
public static <T> T callConstructor(Constructor<T> constructor)
throws TestUtilsException {
try {
constructor.setAccessible(true);
return constructor.newInstance();
} catch (InstantiationException | IllegalAccessException |
InvocationTargetException error) {
throw new TestUtilsException("callConstructor failed", error);
}
}
/**
* Avoid instantiation.
*/
private TestUtils() {}
/**
* Exception that can be thrown if problems are encountered while executing
* the utility method. These are usually problems accessing fields/methods
* through reflection. The original exception can be found by examining the
* cause.
*/
public static class TestUtilsException extends Exception {
private static final long serialVersionUID = 1L;
/**
* Constructs a new exception with the specified detail message and
* cause.
*
* @param message the detail message
* @param cause the original cause of this exception
*/
public TestUtilsException(String message, Throwable cause) {
super(message, cause);
}
}
}
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