spring Tree 源码
springboot Tree 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/fieldvalues/javac/Tree.java
/*
* Copyright 2012-2019 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.boot.configurationprocessor.fieldvalues.javac;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* Reflection based access to {@code com.sun.source.tree.Tree}.
*
* @author Phillip Webb
*/
class Tree extends ReflectionWrapper {
private final Class<?> treeVisitorType = findClass("com.sun.source.tree.TreeVisitor");
private final Method acceptMethod = findMethod("accept", this.treeVisitorType, Object.class);
private final Method getClassTreeMembers = findMethod(findClass("com.sun.source.tree.ClassTree"), "getMembers");
Tree(Object instance) {
super("com.sun.source.tree.Tree", instance);
}
void accept(TreeVisitor visitor) throws Exception {
this.acceptMethod.invoke(getInstance(), Proxy.newProxyInstance(getInstance().getClass().getClassLoader(),
new Class<?>[] { this.treeVisitorType }, new TreeVisitorInvocationHandler(visitor)), 0);
}
/**
* {@link InvocationHandler} to call the {@link TreeVisitor}.
*/
private class TreeVisitorInvocationHandler implements InvocationHandler {
private TreeVisitor treeVisitor;
TreeVisitorInvocationHandler(TreeVisitor treeVisitor) {
this.treeVisitor = treeVisitor;
}
@Override
@SuppressWarnings("rawtypes")
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getName().equals("visitClass") && (Integer) args[1] == 0) {
Iterable members = (Iterable) Tree.this.getClassTreeMembers.invoke(args[0]);
for (Object member : members) {
if (member != null) {
Tree.this.acceptMethod.invoke(member, proxy, ((Integer) args[1]) + 1);
}
}
}
if (method.getName().equals("visitVariable")) {
this.treeVisitor.visitVariable(new VariableTree(args[0]));
}
return null;
}
}
}
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- 所属分类： 后端技术
- 本文标签： Java Spring Spring Boot
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