/* * Copyright 2002-2012 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.support; import java.util.ArrayList; import java.util.Collections; import java.util.List; import java.util.Set; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.BeanUtils; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.core.GenericTypeResolver; import org.springframework.core.annotation.AnnotationAwareOrderComparator; import org.springframework.core.io.ClassPathResource; import org.springframework.core.io.support.ResourcePatternUtils; import org.springframework.test.context.ContextConfigurationAttributes; import org.springframework.test.context.ContextLoader; import org.springframework.test.context.MergedContextConfiguration; import org.springframework.test.context.SmartContextLoader; import org.springframework.util.Assert; import org.springframework.util.ClassUtils; import org.springframework.util.ObjectUtils; import org.springframework.util.ResourceUtils; import org.springframework.util.StringUtils; /** * Abstract application context loader that provides a basis for all concrete * implementations of the {@link ContextLoader} SPI. Provides a * Template Method based approach for {@link #processLocations processing} * resource locations. * *
As of Spring 3.1, {@code AbstractContextLoader} also provides a basis * for all concrete implementations of the {@link SmartContextLoader} SPI. For * backwards compatibility with the {@code ContextLoader} SPI, * {@link #processContextConfiguration(ContextConfigurationAttributes)} delegates * to {@link #processLocations(Class, String...)}. * * @author Sam Brannen * @author Juergen Hoeller * @since 2.5 * @see #generateDefaultLocations * @see #modifyLocations */ public abstract class AbstractContextLoader implements SmartContextLoader { private static final Log logger = LogFactory.getLog(AbstractContextLoader.class); private static final String[] EMPTY_STRING_ARRAY = new String[0]; private static final String SLASH = "/"; // --- SmartContextLoader ----------------------------------------------- /** * For backwards compatibility with the {@link ContextLoader} SPI, the * default implementation simply delegates to {@link #processLocations(Class, String...)}, * passing it the {@link ContextConfigurationAttributes#getDeclaringClass() * declaring class} and {@link ContextConfigurationAttributes#getLocations() * resource locations} retrieved from the supplied * {@link ContextConfigurationAttributes configuration attributes}. The * processed locations are then * {@link ContextConfigurationAttributes#setLocations(String[]) set} in * the supplied configuration attributes. * *
Can be overridden in subclasses — for example, to process * annotated classes instead of resource locations. * * @since 3.1 * @see #processLocations(Class, String...) */ @Override public void processContextConfiguration(ContextConfigurationAttributes configAttributes) { String[] processedLocations = processLocations(configAttributes.getDeclaringClass(), configAttributes.getLocations()); configAttributes.setLocations(processedLocations); } /** * Prepare the {@link ConfigurableApplicationContext} created by this * {@code SmartContextLoader} before bean definitions are read. * *
The default implementation: *
Any {@code ApplicationContextInitializers} implementing
* {@link org.springframework.core.Ordered Ordered} or marked with {@link
* org.springframework.core.annotation.Order @Order} will be sorted appropriately.
*
* @param context the newly created application context
* @param mergedConfig the merged context configuration
* @see ApplicationContextInitializer#initialize(ConfigurableApplicationContext)
* @see #loadContext(MergedContextConfiguration)
* @see ConfigurableApplicationContext#setId
* @since 3.2
*/
@SuppressWarnings("unchecked")
protected void prepareContext(ConfigurableApplicationContext context, MergedContextConfiguration mergedConfig) {
context.getEnvironment().setActiveProfiles(mergedConfig.getActiveProfiles());
Set For example, if the supplied class is {@code com.example.MyTest},
* the generated locations will contain a single string with a value of
* "classpath:/com/example/MyTest{@code <suffix>}",
* where {@code <suffix>} is the value of the
* {@link #getResourceSuffix() resource suffix} string.
*
* As of Spring 3.1, the implementation of this method adheres to the
* contract defined in the {@link SmartContextLoader} SPI. Specifically,
* this method will preemptively verify that the generated default
* location actually exists. If it does not exist, this method will log a
* warning and return an empty array.
*
* Subclasses can override this method to implement a different
* default location generation strategy.
*
* @param clazz the class for which the default locations are to be generated
* @return an array of default application context resource locations
* @since 2.5
* @see #getResourceSuffix()
*/
protected String[] generateDefaultLocations(Class> clazz) {
Assert.notNull(clazz, "Class must not be null");
String suffix = getResourceSuffix();
Assert.hasText(suffix, "Resource suffix must not be empty");
String resourcePath = SLASH + ClassUtils.convertClassNameToResourcePath(clazz.getName()) + suffix;
String prefixedResourcePath = ResourceUtils.CLASSPATH_URL_PREFIX + resourcePath;
ClassPathResource classPathResource = new ClassPathResource(resourcePath, clazz);
if (classPathResource.exists()) {
if (logger.isInfoEnabled()) {
logger.info(String.format("Detected default resource location \"%s\" for test class [%s].",
prefixedResourcePath, clazz.getName()));
}
return new String[] { prefixedResourcePath };
}
// else
if (logger.isInfoEnabled()) {
logger.info(String.format("Could not detect default resource locations for test class [%s]: "
+ "%s does not exist.", clazz.getName(), classPathResource));
}
return EMPTY_STRING_ARRAY;
}
/**
* Generate a modified version of the supplied locations array and return it.
*
* A plain path — for example, "context.xml" — will
* be treated as a classpath resource that is relative to the package in which
* the specified class is defined. A path starting with a slash is treated
* as an absolute classpath location, for example:
* "/org/springframework/whatever/foo.xml". A path which
* references a URL (e.g., a path prefixed with
* {@link ResourceUtils#CLASSPATH_URL_PREFIX classpath:},
* {@link ResourceUtils#FILE_URL_PREFIX file:}, {@code http:},
* etc.) will be added to the results unchanged.
*
* Subclasses can override this method to implement a different
* location modification strategy.
*
* @param clazz the class with which the locations are associated
* @param locations the resource locations to be modified
* @return an array of modified application context resource locations
* @since 2.5
*/
protected String[] modifyLocations(Class> clazz, String... locations) {
String[] modifiedLocations = new String[locations.length];
for (int i = 0; i < locations.length; i++) {
String path = locations[i];
if (path.startsWith(SLASH)) {
modifiedLocations[i] = ResourceUtils.CLASSPATH_URL_PREFIX + path;
} else if (!ResourcePatternUtils.isUrl(path)) {
modifiedLocations[i] = ResourceUtils.CLASSPATH_URL_PREFIX + SLASH
+ StringUtils.cleanPath(ClassUtils.classPackageAsResourcePath(clazz) + SLASH + path);
} else {
modifiedLocations[i] = StringUtils.cleanPath(path);
}
}
return modifiedLocations;
}
/**
* Determine whether or not default resource locations should be
* generated if the {@code locations} provided to
* {@link #processLocations(Class, String...)} are {@code null} or empty.
*
* As of Spring 3.1, the semantics of this method have been overloaded
* to include detection of either default resource locations or default
* configuration classes. Consequently, this method can also be used to
* determine whether or not default configuration classes should be
* detected if the {@code classes} present in the
* {@link ContextConfigurationAttributes configuration attributes} supplied
* to {@link #processContextConfiguration(ContextConfigurationAttributes)}
* are {@code null} or empty.
*
* Can be overridden by subclasses to change the default behavior.
*
* @return always {@code true} by default
* @since 2.5
*/
protected boolean isGenerateDefaultLocations() {
return true;
}
/**
* Get the suffix to append to {@link ApplicationContext} resource locations
* when generating default locations.
*
* Must be implemented by subclasses.
*
* @return the resource suffix; should not be {@code null} or empty
* @since 2.5
* @see #generateDefaultLocations(Class)
*/
protected abstract String getResourceSuffix();
}