org.springframework.test.context.BootstrapUtils Maven / Gradle / Ivy
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/*
* Copyright 2002-2016 the original author or authors.
*
* 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.springframework.test.context;
import java.lang.reflect.Constructor;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeanUtils;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* {@code BootstrapUtils} is a collection of utility methods to assist with
* bootstrapping the Spring TestContext Framework.
*
* @author Sam Brannen
* @author Phillip Webb
* @since 4.1
* @see BootstrapWith
* @see BootstrapContext
* @see TestContextBootstrapper
*/
abstract class BootstrapUtils {
private static final String DEFAULT_BOOTSTRAP_CONTEXT_CLASS_NAME =
"org.springframework.test.context.support.DefaultBootstrapContext";
private static final String DEFAULT_CACHE_AWARE_CONTEXT_LOADER_DELEGATE_CLASS_NAME =
"org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate";
private static final String DEFAULT_TEST_CONTEXT_BOOTSTRAPPER_CLASS_NAME =
"org.springframework.test.context.support.DefaultTestContextBootstrapper";
private static final String DEFAULT_WEB_TEST_CONTEXT_BOOTSTRAPPER_CLASS_NAME =
"org.springframework.test.context.web.WebTestContextBootstrapper";
private static final String WEB_APP_CONFIGURATION_ANNOTATION_CLASS_NAME =
"org.springframework.test.context.web.WebAppConfiguration";
private static final Log logger = LogFactory.getLog(BootstrapUtils.class);
/**
* Create the {@code BootstrapContext} for the specified {@linkplain Class test class}.
* Uses reflection to create a {@link org.springframework.test.context.support.DefaultBootstrapContext}
* that uses a {@link org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate}.
* @param testClass the test class for which the bootstrap context should be created
* @return a new {@code BootstrapContext}; never {@code null}
*/
@SuppressWarnings("unchecked")
static BootstrapContext createBootstrapContext(Class testClass) {
CacheAwareContextLoaderDelegate cacheAwareContextLoaderDelegate = createCacheAwareContextLoaderDelegate();
Class clazz = null;
try {
clazz = (Class) ClassUtils.forName(
DEFAULT_BOOTSTRAP_CONTEXT_CLASS_NAME, BootstrapUtils.class.getClassLoader());
Constructor constructor = clazz.getConstructor(
Class.class, CacheAwareContextLoaderDelegate.class);
if (logger.isDebugEnabled()) {
logger.debug(String.format("Instantiating BootstrapContext using constructor [%s]", constructor));
}
return BeanUtils.instantiateClass(constructor, testClass, cacheAwareContextLoaderDelegate);
}
catch (Throwable ex) {
throw new IllegalStateException("Could not load BootstrapContext [" + clazz + "]", ex);
}
}
@SuppressWarnings("unchecked")
private static CacheAwareContextLoaderDelegate createCacheAwareContextLoaderDelegate() {
Class clazz = null;
try {
clazz = (Class) ClassUtils.forName(
DEFAULT_CACHE_AWARE_CONTEXT_LOADER_DELEGATE_CLASS_NAME, BootstrapUtils.class.getClassLoader());
if (logger.isDebugEnabled()) {
logger.debug(String.format("Instantiating CacheAwareContextLoaderDelegate from class [%s]",
clazz.getName()));
}
return BeanUtils.instantiateClass(clazz, CacheAwareContextLoaderDelegate.class);
}
catch (Throwable ex) {
throw new IllegalStateException("Could not load CacheAwareContextLoaderDelegate [" + clazz + "]", ex);
}
}
/**
* Resolve the {@link TestContextBootstrapper} type for the test class in the
* supplied {@link BootstrapContext}, instantiate it, and provide it a reference
* to the {@link BootstrapContext}.
*
If the {@link BootstrapWith @BootstrapWith} annotation is present on
* the test class, either directly or as a meta-annotation, then its
* {@link BootstrapWith#value value} will be used as the bootstrapper type.
* Otherwise, either the
* {@link org.springframework.test.context.support.DefaultTestContextBootstrapper
* DefaultTestContextBootstrapper} or the
* {@link org.springframework.test.context.web.WebTestContextBootstrapper
* WebTestContextBootstrapper} will be used, depending on the presence of
* {@link org.springframework.test.context.web.WebAppConfiguration @WebAppConfiguration}.
* @param bootstrapContext the bootstrap context to use
* @return a fully configured {@code TestContextBootstrapper}
*/
static TestContextBootstrapper resolveTestContextBootstrapper(BootstrapContext bootstrapContext) {
Class testClass = bootstrapContext.getTestClass();
Class clazz = null;
try {
clazz = resolveExplicitTestContextBootstrapper(testClass);
if (clazz == null) {
clazz = resolveDefaultTestContextBootstrapper(testClass);
}
if (logger.isDebugEnabled()) {
logger.debug(String.format("Instantiating TestContextBootstrapper for test class [%s] from class [%s]",
testClass.getName(), clazz.getName()));
}
TestContextBootstrapper testContextBootstrapper =
BeanUtils.instantiateClass(clazz, TestContextBootstrapper.class);
testContextBootstrapper.setBootstrapContext(bootstrapContext);
return testContextBootstrapper;
}
catch (IllegalStateException ex) {
throw ex;
}
catch (Throwable ex) {
throw new IllegalStateException("Could not load TestContextBootstrapper [" + clazz +
"]. Specify @BootstrapWith's 'value' attribute or make the default bootstrapper class available.",
ex);
}
}
@Nullable
private static Class resolveExplicitTestContextBootstrapper(Class testClass) {
Set annotations = AnnotatedElementUtils.findAllMergedAnnotations(testClass, BootstrapWith.class);
if (annotations.size() < 1) {
return null;
}
Assert.state(annotations.size() <= 1, () -> String.format(
"Configuration error: found multiple declarations of @BootstrapWith for test class [%s]: %s",
testClass.getName(), annotations));
return annotations.iterator().next().value();
}
private static Class resolveDefaultTestContextBootstrapper(Class testClass) throws Exception {
ClassLoader classLoader = BootstrapUtils.class.getClassLoader();
AnnotationAttributes attributes = AnnotatedElementUtils.findMergedAnnotationAttributes(testClass,
WEB_APP_CONFIGURATION_ANNOTATION_CLASS_NAME, false, false);
if (attributes != null) {
return ClassUtils.forName(DEFAULT_WEB_TEST_CONTEXT_BOOTSTRAPPER_CLASS_NAME, classLoader);
}
return ClassUtils.forName(DEFAULT_TEST_CONTEXT_BOOTSTRAPPER_CLASS_NAME, classLoader);
}
}