spring FormatHelper 源码
spring FormatHelper 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/spel/ast/FormatHelper.java
/*
* Copyright 2002-2018 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.expression.spel.ast;
import java.util.List;
import java.util.StringJoiner;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;
import org.springframework.util.ClassUtils;
/**
* Utility methods (formatters etc) used during parsing and evaluation.
*
* @author Andy Clement
*/
abstract class FormatHelper {
/**
* Produce a readable representation for a given method name with specified arguments.
* @param name the name of the method
* @param argumentTypes the types of the arguments to the method
* @return a nicely formatted representation, e.g. {@code foo(String,int)}
*/
public static String formatMethodForMessage(String name, List<TypeDescriptor> argumentTypes) {
StringJoiner sj = new StringJoiner(",", "(", ")");
for (TypeDescriptor typeDescriptor : argumentTypes) {
if (typeDescriptor != null) {
sj.add(formatClassNameForMessage(typeDescriptor.getType()));
}
else {
sj.add(formatClassNameForMessage(null));
}
}
return name + sj.toString();
}
/**
* Determine a readable name for a given Class object.
* <p>A String array will have the formatted name "java.lang.String[]".
* @param clazz the Class whose name is to be formatted
* @return a formatted String suitable for message inclusion
* @see ClassUtils#getQualifiedName(Class)
*/
public static String formatClassNameForMessage(@Nullable Class<?> clazz) {
return (clazz != null ? ClassUtils.getQualifiedName(clazz) : "null");
}
}
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