com.gitee.cn9750wang.webtools.error.P21Exception Maven / Gradle / Ivy

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/*
 *    Copyright 2021 wwy
 *
 *    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.
 */
package com.gitee.cn9750wang.webtools.error;

import com.gitee.cn9750wang.webtools.error.defines.ServerErr;
import com.gitee.cn9750wang.webtools.vo.result.error.ErrorMessage;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

/**
 * 异常类
 * @author wwy
 */
public class P21Exception extends RuntimeException{

    private List errors = null;

    public P21Exception(){
        super();
    }

    public P21Exception(Throwable cause) {
        super(cause);
        addToList(ServerErr.SERVER_ERR.getMessage().setMsg(cause.getMessage()));
    }

    public P21Exception(String message) {
        super(message);
        addToList(ServerErr.SERVER_ERR.getMessage().setMsg(message));
    }

    /**
     * 添加一条错误信息到错误列表中
     * @param code 错误代码
     * @param msg 错误信息
     * @return 异常对象
     */
    public P21Exception error(ErrorCode code,String msg){
        return this.error(new ErrorMessage(code,msg));
    }

    /**
     * 添加一条错误信息到错误列表中
     * @param message 错误信息对象
     * @return 异常对象
     */
    public P21Exception error(ErrorMessage message){
        if(message == null){
            return this;
        }
        addToList(message);
        return this;
    }

    private void addToList(ErrorMessage message){
        if(errors == null){
            errors = Collections.singletonList(message);
        }else if(errors.size() == 1){
            var newList = new ArrayList();
            newList.add(errors.get(0));
            newList.add(message);
            errors = newList;
        }else{
            errors.add(message);
        }
    }

    /**
     * 获取所有错误信息
     * @return 错误信息列表,永远也不会返回null
     */
    public Collection getErrors() {
        if(errors == null){
            return Collections.emptyList();
        }
        return errors;
    }

    /**
     * 将错误列表的容量修剪为错误列表的当前大小
     */
    public void trimErrors(){
        if(errors instanceof ArrayList){
            ((ArrayList) errors).trimToSize();
        }
    }

    @Override
    public String getMessage() {
        if(errors == null){
            return super.getMessage();
        }else if(errors.size() == 1){
            return errors.get(0).getMsg();
        }
        var sb = new StringBuilder();
        final int len = errors.size();
        for(int i = 0; i < len; i++){
            sb.append(i).append(". ").append(errors.get(i).getMsg()).append('\n');
        }
        return sb.toString();
    }


}