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sviolet.thistle.util.conversion.BeanMethodNameUtils Maven / Gradle / Ivy

/*
 * Copyright (C) 2015-2017 S.Violet
 *
 * 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
 *
 *      http://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.
 *
 * Project GitHub: https://github.com/shepherdviolet/thistle
 * Email: [email protected]
 */

package sviolet.thistle.util.conversion;

/**
 * 

根据JavaBean的参数名转化为方法名

* * 1、如果属性名的第二个字母大写,那么该属性名直接用作 getter/setter 方法中 get/set 的后部分,就是说大小写不变。例如属性名为uName,方法是getuName/setuName。
* 2、如果前两个字母是大写(一般的专有名词和缩略词都会大写),也是属性名直接用作 getter/setter 方法中 get/set 的后部分。例如属性名为URL,方法是getURL/setURL。
* 3、如果首字母大写,也是属性名直接用作 getter/setter 方法中 get/set 的后部分。例如属性名为Name,方法是getName/setName,这种是最糟糕的情况,会找不到属性出错,因为默认的属性名是name。
* *

根据JavaBean的方法名转化为参数名

* * @author S.Violet */ public class BeanMethodNameUtils { /** * 将FieldName转化为setter方法名 * @param fieldName fieldName of java bean */ public static String fieldToSetter(String fieldName) { return "set" + formatFieldName(fieldName); } /** * 将FieldName转化为getter方法名 * @param fieldName fieldName of java bean */ public static String fieldToGetter(String fieldName) { return "get" + formatFieldName(fieldName); } /** * 将FieldName转化为getter方法名(boolean属性专用的isXXX()) * @param fieldName fieldName of java bean */ public static String fieldToBoolGetter(String fieldName) { return "is" + formatFieldName(fieldName); } /** * 将is/get/set方法名转化为参数名(去掉前面的is/get/set, 将首字母转小写) * @param methodName 方法名 * @return 参数名, 若返回null, 表示方法名不符合标准 */ public static String methodToField(String methodName) { if (methodName == null || methodName.length() <= 2) { return null; } if (methodName.startsWith("set") || methodName.startsWith("get")) { if (methodName.length() == 3) { return null; } char[] fieldNameChars = methodName.substring(3, methodName.length()).toCharArray(); if (fieldNameChars[0] > 64 && fieldNameChars[0] < 91) { fieldNameChars[0] += 32; } return String.valueOf(fieldNameChars); } else if (methodName.startsWith("is")) { char[] fieldNameChars = methodName.substring(2, methodName.length()).toCharArray(); if (fieldNameChars[0] > 64 && fieldNameChars[0] < 91) { fieldNameChars[0] += 32; } return String.valueOf(fieldNameChars); } return null; } private static String formatFieldName(String fieldName) { //检查输入 if (fieldName == null || fieldName.length() <= 0) { return ""; } //转为charArray char[] fieldNameChars = fieldName.toCharArray(); //判断第一位字符 final char firstChar = fieldNameChars[0]; boolean isFirstCharLowerCase; if (firstChar > 64 && firstChar < 91) { isFirstCharLowerCase = false; } else if (firstChar > 96 && firstChar < 123){ isFirstCharLowerCase = true; } else { //第一个字符异常的话, 直接返回 return fieldName; } //判断第二个字符 final char secondChar; boolean isSecondCharLowerCase = true; if (fieldNameChars.length > 1){ secondChar = fieldNameChars[1]; //第二个字符异常的话, 视为小写(试图把首字母变大写) isSecondCharLowerCase = secondChar <= 64 || secondChar >= 91; } //当前两位都是小写字母, 首字母变为大写 if (isFirstCharLowerCase && isSecondCharLowerCase){ fieldNameChars[0] -= 32; } return String.valueOf(fieldNameChars); } }




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