CommonBizException.java

import java.lang.reflect.Constructor;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

import org.apache.commons.lang3.ArrayUtils;

/**
 * 业务异常基类，所有业务异常都必须继承于此异常
 *
 * @author: yufan.sheng
 * @since: 2014-09-17 上午12:57:30
 * @version: 1.0
 */

public class CommonBizException extends RuntimeException {

    private static final long serialVersionUID = -5097768787801034398L;

    /**
     * 异常ID，用于表示某一异常实例，每一个异常实例都有一个唯一的异常ID
     */
    protected String id;

    /**
     * 异常信息，包含必要的上下文业务信息，用于打印日志
     */
    protected String message;

    /**
     * 具体异常码，即异常码code的后3位，由各具体异常实例化时自己定义
     */
    protected String defineCode;

    protected String realClassName;

    protected CommonBizException(String defineCode) {
        super();
        this.defineCode = defineCode;
        initId();
    }

    private void initId() {
        this.id = UUID.randomUUID().toString().toUpperCase().replaceAll("-", "");
    }

    public String getId() {
        return id;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message, Object... args) {
        this.message = MessageFormat.format(message, args);
    }


    public String getDefineCode() {
        return defineCode;
    }

    public static <T extends CommonBizException> T newException(T exception, String message, Object...args) {
        if(exception == null) {
            throw new RuntimeException("no exception instance specified");
        } try {
            Constructor constructor = exception.getClass().getDeclaredConstructor(String.class);
            constructor.setAccessible(true);
            T newException = (T)constructor.newInstance(exception.getDefineCode());
            newException.setMessage(message, args);
            return newException;
        } catch (Throwable e) {
            throw new RuntimeException("create exception instance fail : "+e.getMessage(), e);
        }
    }

    /**
     * 比较异常的class和defineCode是否相同
     * @param e
     * @return
     */
    public boolean codeEquals(CommonBizException e){
        if(e == null){
            return false;
        }
        if(!e.getClass().equals(this.getClass())){
            return false;
        }
        if(!e.getDefineCode().equals(getDefineCode())){
            return false;
        }
        return true;
    }

    public CommonBizException upcasting() {
        if(this.getClass().equals(CommonBizException.class)){
            return this;
        }
        CommonBizException superexception = new CommonBizException(this.defineCode);
        superexception.message = this.message;
        superexception.realClassName = this.getClass().getName();
        superexception.id = this.id;
        superexception.setStackTrace(this.getStackTrace());
        return superexception;
    }

    public CommonBizException downcasting(){
        if(this.realClassName == null || CommonBizException.class.getName().equals(this.realClassName)){
            return this;
        }
        Class clz = null;
        try{
            clz = Class.forName(this.realClassName);
        }catch(Exception e){
        }
        if(clz == null){
            return this;
        }
        try {
            Constructor constructor = clz.getDeclaredConstructor(String.class);
            constructor.setAccessible(true);
            CommonBizException newException = (CommonBizException)constructor.newInstance(this.defineCode);
            newException.message = this.message;
            newException.id = this.id;
            newException.setStackTrace(this.getStackTrace());
            return newException;
        } catch (Throwable e) {
            return this;
        }
    }

    public String getRealClassName() {
        if(realClassName==null){
            return this.getClass().getName();
        }
        return realClassName;
    }

    public void mergeStackTrace(StackTraceElement[] stackTrace){
        this.setStackTrace(ArrayUtils.addAll(this.getStackTrace(), stackTrace));
    }

    public StackTraceElement[] getCoreStackTrace(){
        List<StackTraceElement> list = new ArrayList<StackTraceElement>();
        for(StackTraceElement traceEle : getStackTrace()){
            if(traceEle.getClassName().startsWith("com.yeepay")){
                list.add(traceEle);
            }
        }
        StackTraceElement[] stackTrace = new StackTraceElement[list.size()];
        return list.toArray(stackTrace);
    }

    public String getCoreStackTraceStr(){
        StringBuffer sb = new StringBuffer();
        for(StackTraceElement traceEle : getCoreStackTrace()){
            sb.append("\n"+traceEle.toString());
        }
        return sb.toString();
    }
}

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