/*
* Copyright 2012-2016 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.boot.test.context;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider;
import org.springframework.core.type.filter.AnnotationTypeFilter;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
/**
* Internal utility class to scan for a {@link SpringBootConfiguration} class.
*
* @author Phillip Webb
*/
final class SpringBootConfigurationFinder {
private static final Map<String, Class<?>> cache = Collections
.synchronizedMap(new Cache(40));
private final ClassPathScanningCandidateComponentProvider scanner;
SpringBootConfigurationFinder() {
this.scanner = new ClassPathScanningCandidateComponentProvider(false);
this.scanner.addIncludeFilter(
new AnnotationTypeFilter(SpringBootConfiguration.class));
this.scanner.setResourcePattern("*.class");
}
public Class<?> findFromClass(Class<?> source) {
Assert.notNull(source, "Source must not be null");
return findFromPackage(ClassUtils.getPackageName(source));
}
public Class<?> findFromPackage(String source) {
Assert.notNull(source, "Source must not be null");
Class<?> configuration = cache.get(source);
if (configuration == null) {
configuration = scanPackage(source);
cache.put(source, configuration);
}
return configuration;
}
private Class<?> scanPackage(String source) {
while (source.length() > 0) {
Set<BeanDefinition> components = this.scanner.findCandidateComponents(source);
if (!components.isEmpty()) {
Assert.state(components.size() == 1,
"Found multiple @SpringBootConfiguration annotated classes "
+ components);
return ClassUtils.resolveClassName(
components.iterator().next().getBeanClassName(), null);
}
source = getParentPackage(source);
}
return null;
}
private String getParentPackage(String sourcePackage) {
int lastDot = sourcePackage.lastIndexOf(".");
return (lastDot == -1 ? "" : sourcePackage.substring(0, lastDot));
}
/**
* Cache implementation based on {@link LinkedHashMap}.
*/
private static class Cache extends LinkedHashMap<String, Class<?>> {
private final int maxSize;
Cache(int maxSize) {
super(16, 0.75f, true);
this.maxSize = maxSize;
}
@Override
protected boolean removeEldestEntry(Map.Entry<String, Class<?>> eldest) {
return size() > this.maxSize;
}
}
}