spring ResolvableTypeCodeGenerator 源码
spring ResolvableTypeCodeGenerator 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/aot/ResolvableTypeCodeGenerator.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.beans.factory.aot;
import java.util.Arrays;
import org.springframework.core.ResolvableType;
import org.springframework.javapoet.CodeBlock;
import org.springframework.util.ClassUtils;
/**
* Internal code generator used to support {@link ResolvableType}.
*
* @author Stephane Nicoll
* @author Phillip Webb
* @since 6.0
*/
final class ResolvableTypeCodeGenerator {
private ResolvableTypeCodeGenerator() {
}
public static CodeBlock generateCode(ResolvableType resolvableType) {
return generateCode(resolvableType, false);
}
private static CodeBlock generateCode(ResolvableType resolvableType, boolean allowClassResult) {
if (ResolvableType.NONE.equals(resolvableType)) {
return CodeBlock.of("$T.NONE", ResolvableType.class);
}
Class<?> type = ClassUtils.getUserClass(resolvableType.toClass());
if (resolvableType.hasGenerics()) {
return generateCodeWithGenerics(resolvableType, type);
}
if (allowClassResult) {
return CodeBlock.of("$T.class", type);
}
return CodeBlock.of("$T.forClass($T.class)", ResolvableType.class, type);
}
private static CodeBlock generateCodeWithGenerics(ResolvableType target, Class<?> type) {
ResolvableType[] generics = target.getGenerics();
boolean hasNoNestedGenerics = Arrays.stream(generics).noneMatch(ResolvableType::hasGenerics);
CodeBlock.Builder builder = CodeBlock.builder();
builder.add("$T.forClassWithGenerics($T.class", ResolvableType.class, type);
for (ResolvableType generic : generics) {
builder.add(", $L", generateCode(generic, hasNoNestedGenerics));
}
builder.add(")");
return builder.build();
}
}
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