spring SimpleMetadataReader 源码
spring SimpleMetadataReader 代码
文件路径：/spring-core/src/main/java/org/springframework/core/type/classreading/SimpleMetadataReader.java
/*
* Copyright 2002-2022 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.IOException;
import java.io.InputStream;
import org.springframework.asm.ClassReader;
import org.springframework.core.io.Resource;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.ClassMetadata;
import org.springframework.lang.Nullable;
/**
* {@link MetadataReader} implementation based on an ASM
* {@link org.springframework.asm.ClassReader}.
*
* @author Juergen Hoeller
* @author Costin Leau
* @since 2.5
*/
final class SimpleMetadataReader implements MetadataReader {
private static final int PARSING_OPTIONS = ClassReader.SKIP_DEBUG
| ClassReader.SKIP_CODE | ClassReader.SKIP_FRAMES;
private final Resource resource;
private final AnnotationMetadata annotationMetadata;
SimpleMetadataReader(Resource resource, @Nullable ClassLoader classLoader) throws IOException {
SimpleAnnotationMetadataReadingVisitor visitor = new SimpleAnnotationMetadataReadingVisitor(classLoader);
getClassReader(resource).accept(visitor, PARSING_OPTIONS);
this.resource = resource;
this.annotationMetadata = visitor.getMetadata();
}
private static ClassReader getClassReader(Resource resource) throws IOException {
try (InputStream is = resource.getInputStream()) {
try {
return new ClassReader(is);
}
catch (IllegalArgumentException ex) {
throw new IOException("ASM ClassReader failed to parse class file - " +
"probably due to a new Java class file version that isn't supported yet: " + resource, ex);
}
}
}
@Override
public Resource getResource() {
return this.resource;
}
@Override
public ClassMetadata getClassMetadata() {
return this.annotationMetadata;
}
@Override
public AnnotationMetadata getAnnotationMetadata() {
return this.annotationMetadata;
}
}
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