spring ExpressionTree 源码
springboot ExpressionTree 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/ExpressionTree.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.Method;
import java.util.ArrayList;
import java.util.List;
/**
* Reflection based access to {@code com.sun.source.tree.ExpressionTree}.
*
* @author Phillip Webb
* @author Stephane Nicoll
*/
class ExpressionTree extends ReflectionWrapper {
private final Class<?> literalTreeType = findClass("com.sun.source.tree.LiteralTree");
private final Method literalValueMethod = findMethod(this.literalTreeType, "getValue");
private final Class<?> methodInvocationTreeType = findClass("com.sun.source.tree.MethodInvocationTree");
private final Method methodInvocationArgumentsMethod = findMethod(this.methodInvocationTreeType, "getArguments");
private final Class<?> newArrayTreeType = findClass("com.sun.source.tree.NewArrayTree");
private final Method arrayValueMethod = findMethod(this.newArrayTreeType, "getInitializers");
ExpressionTree(Object instance) {
super("com.sun.source.tree.ExpressionTree", instance);
}
String getKind() throws Exception {
return findMethod("getKind").invoke(getInstance()).toString();
}
Object getLiteralValue() throws Exception {
if (this.literalTreeType.isAssignableFrom(getInstance().getClass())) {
return this.literalValueMethod.invoke(getInstance());
}
return null;
}
Object getFactoryValue() throws Exception {
if (this.methodInvocationTreeType.isAssignableFrom(getInstance().getClass())) {
List<?> arguments = (List<?>) this.methodInvocationArgumentsMethod.invoke(getInstance());
if (arguments.size() == 1) {
return new ExpressionTree(arguments.get(0)).getLiteralValue();
}
}
return null;
}
List<? extends ExpressionTree> getArrayExpression() throws Exception {
if (this.newArrayTreeType.isAssignableFrom(getInstance().getClass())) {
List<?> elements = (List<?>) this.arrayValueMethod.invoke(getInstance());
List<ExpressionTree> result = new ArrayList<>();
if (elements == null) {
return result;
}
for (Object element : elements) {
result.add(new ExpressionTree(element));
}
return result;
}
return null;
}
}
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- 本文标签： Java Spring Spring Boot
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