/**
    *    Copyright 2009-2020 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
    *
    *       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 org.apache.ibatis.executor;
  
  /**
   * @author Clinton Begin
   */
  public class ErrorContext {
  
    private static final String LINE_SEPARATOR = System.lineSeparator();
    private static final ThreadLocal<ErrorContext> LOCAL = new ThreadLocal<>();
  
    private ErrorContext stored;
    private String resource;
    private String activity;
    private String object;
    private String message;
    private String sql;
    private Throwable cause;
  
    private ErrorContext() {
    }
  
    public static ErrorContext instance() {
      ErrorContext context = LOCAL.get();
      if (context == null) {
        context = new ErrorContext();
        LOCAL.set(context);
      }
      return context;
    }
  
    public ErrorContext store() {
      ErrorContextt.html#ErrorContext">ErrorContext newContext = new ErrorContext();
      newContext.stored = this;
      LOCAL.set(newContext);
      return LOCAL.get();
    }
  
    public ErrorContext recall() {
      if (stored != null) {
        LOCAL.set(stored);
        stored = null;
      }
      return LOCAL.get();
    }
  
    public ErrorContext resource(String resource) {
      this.resource = resource;
      return this;
    }
  
    public ErrorContext activity(String activity) {
      this.activity = activity;
      return this;
    }
  
    public ErrorContext object(String object) {
      this.object = object;
      return this;
    }
  
    public ErrorContext message(String message) {
      this.message = message;
      return this;
    }
  
    public ErrorContext sql(String sql) {
      this.sql = sql;
      return this;
    }
  
    public ErrorContext cause(Throwable cause) {
      this.cause = cause;
      return this;
    }
  
    public ErrorContext reset() {
      resource = null;
      activity = null;
      object = null;
      message = null;
      sql = null;
      cause = null;
      LOCAL.remove();
      return this;
   }
 
   @Override
   public String toString() {
     StringBuilder description = new StringBuilder();
 
     // message
     if (this.message != null) {
       description.append(LINE_SEPARATOR);
       description.append("### ");
       description.append(this.message);
     }
 
     // resource
     if (resource != null) {
       description.append(LINE_SEPARATOR);
       description.append("### The error may exist in ");
       description.append(resource);
     }
 
     // object
     if (object != null) {
       description.append(LINE_SEPARATOR);
       description.append("### The error may involve ");
       description.append(object);
     }
 
     // activity
     if (activity != null) {
       description.append(LINE_SEPARATOR);
       description.append("### The error occurred while ");
       description.append(activity);
     }
 
     // sql
     if (sql != null) {
       description.append(LINE_SEPARATOR);
       description.append("### SQL: ");
       description.append(sql.replace('\n', ' ').replace('\r', ' ').replace('\t', ' ').trim());
     }
 
     // cause
     if (cause != null) {
       description.append(LINE_SEPARATOR);
       description.append("### Cause: ");
       description.append(cause.toString());
     }
 
     return description.toString();
   }
 
 }