org.springframework.core.type.classreading.SimpleMethodMetadataReadingVisitor Maven / Gradle / Ivy
/*
* Copyright 2002-2019 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.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import org.springframework.asm.AnnotationVisitor;
import org.springframework.asm.MethodVisitor;
import org.springframework.asm.SpringAsmInfo;
import org.springframework.asm.Type;
import org.springframework.core.annotation.MergedAnnotation;
import org.springframework.core.annotation.MergedAnnotations;
import org.springframework.lang.Nullable;
/**
* ASM method visitor that creates {@link SimpleMethodMetadata}.
*
* @author Phillip Webb
* @since 5.2
*/
final class SimpleMethodMetadataReadingVisitor extends MethodVisitor {
@Nullable
private final ClassLoader classLoader;
private final String declaringClassName;
private final int access;
private final String name;
private final String descriptor;
private final List> annotations = new ArrayList<>(4);
private final Consumer consumer;
@Nullable
private Source source;
SimpleMethodMetadataReadingVisitor(@Nullable ClassLoader classLoader, String declaringClassName,
int access, String name, String descriptor, Consumer consumer) {
super(SpringAsmInfo.ASM_VERSION);
this.classLoader = classLoader;
this.declaringClassName = declaringClassName;
this.access = access;
this.name = name;
this.descriptor = descriptor;
this.consumer = consumer;
}
@Override
@Nullable
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
return MergedAnnotationReadingVisitor.get(this.classLoader, this::getSource,
descriptor, visible, this.annotations::add);
}
@Override
public void visitEnd() {
if (!this.annotations.isEmpty()) {
String returnTypeName = Type.getReturnType(this.descriptor).getClassName();
MergedAnnotations annotations = MergedAnnotations.of(this.annotations);
SimpleMethodMetadata metadata = new SimpleMethodMetadata(this.name,
this.access, this.declaringClassName, returnTypeName, annotations);
this.consumer.accept(metadata);
}
}
private Object getSource() {
Source source = this.source;
if (source == null) {
source = new Source(this.declaringClassName, this.name, this.descriptor);
this.source = source;
}
return source;
}
/**
* {@link MergedAnnotation} source.
*/
static final class Source {
private final String declaringClassName;
private final String name;
private final String descriptor;
@Nullable
private String toStringValue;
Source(String declaringClassName, String name, String descriptor) {
this.declaringClassName = declaringClassName;
this.name = name;
this.descriptor = descriptor;
}
@Override
public int hashCode() {
int result = 1;
result = 31 * result + this.declaringClassName.hashCode();
result = 31 * result + this.name.hashCode();
result = 31 * result + this.descriptor.hashCode();
return result;
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (other == null || getClass() != other.getClass()) {
return false;
}
Source otherSource = (Source) other;
return (this.declaringClassName.equals(otherSource.declaringClassName) &&
this.name.equals(otherSource.name) && this.descriptor.equals(otherSource.descriptor));
}
@Override
public String toString() {
String value = this.toStringValue;
if (value == null) {
StringBuilder builder = new StringBuilder();
builder.append(this.declaringClassName);
builder.append(".");
builder.append(this.name);
Type[] argumentTypes = Type.getArgumentTypes(this.descriptor);
builder.append("(");
for (Type type : argumentTypes) {
builder.append(type.getClassName());
}
builder.append(")");
value = builder.toString();
this.toStringValue = value;
}
return value;
}
}
}