org.springframework.core.type.classreading.SimpleMetadataReaderFactory Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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
*
* https://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.core.type.classreading;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* Simple implementation of the {@link MetadataReaderFactory} interface,
* creating a new ASM {@link org.springframework.asm.ClassReader} for every request.
*
* @author Juergen Hoeller
* @since 2.5
*/
public class SimpleMetadataReaderFactory implements MetadataReaderFactory {
private final ResourceLoader resourceLoader;
/**
* Create a new SimpleMetadataReaderFactory for the default class loader.
*/
public SimpleMetadataReaderFactory() {
this.resourceLoader = new DefaultResourceLoader();
}
/**
* Create a new SimpleMetadataReaderFactory for the given resource loader.
* @param resourceLoader the Spring ResourceLoader to use
* (also determines the ClassLoader to use)
*/
public SimpleMetadataReaderFactory(@Nullable ResourceLoader resourceLoader) {
this.resourceLoader = (resourceLoader != null ? resourceLoader : new DefaultResourceLoader());
}
/**
* Create a new SimpleMetadataReaderFactory for the given class loader.
* @param classLoader the ClassLoader to use
*/
public SimpleMetadataReaderFactory(@Nullable ClassLoader classLoader) {
this.resourceLoader =
(classLoader != null ? new DefaultResourceLoader(classLoader) : new DefaultResourceLoader());
}
/**
* Return the ResourceLoader that this MetadataReaderFactory has been
* constructed with.
*/
public final ResourceLoader getResourceLoader() {
return this.resourceLoader;
}
@Override
public MetadataReader getMetadataReader(String className) throws IOException {
try {
String resourcePath = ResourceLoader.CLASSPATH_URL_PREFIX +
ClassUtils.convertClassNameToResourcePath(className) + ClassUtils.CLASS_FILE_SUFFIX;
Resource resource = this.resourceLoader.getResource(resourcePath);
return getMetadataReader(resource);
}
catch (FileNotFoundException ex) {
// Maybe an inner class name using the dot name syntax? Need to use the dollar syntax here...
// ClassUtils.forName has an equivalent check for resolution into Class references later on.
int lastDotIndex = className.lastIndexOf('.');
if (lastDotIndex != -1) {
String innerClassName =
className.substring(0, lastDotIndex) + '$' + className.substring(lastDotIndex + 1);
String innerClassResourcePath = ResourceLoader.CLASSPATH_URL_PREFIX +
ClassUtils.convertClassNameToResourcePath(innerClassName) + ClassUtils.CLASS_FILE_SUFFIX;
Resource innerClassResource = this.resourceLoader.getResource(innerClassResourcePath);
if (innerClassResource.exists()) {
return getMetadataReader(innerClassResource);
}
}
throw ex;
}
}
@Override
public MetadataReader getMetadataReader(Resource resource) throws IOException {
return new SimpleMetadataReader(resource, this.resourceLoader.getClassLoader());
}
}