content: /*******************************************************************************
   * Copyright 2017 Bstek
   *
   * 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.bstek.ureport.expression.parse;
  
  import org.antlr.v4.runtime.BaseErrorListener;
  import org.antlr.v4.runtime.RecognitionException;
  import org.antlr.v4.runtime.Recognizer;
  
  /**
   * @author
   * @since 2016年12月6日
   */
  public class ExpressionErrorListener extends BaseErrorListener {
  	private StringBuffer sb;
  	@Override
  	public void syntaxError(Recognizer<?, ?> recognizer,Object offendingSymbol,
  			int line, int charPositionInLine,
  			String msg, RecognitionException e) {
  		if(sb==null){
  			sb=new StringBuffer();
  		}
  		sb.append("["+offendingSymbol+"] is invalid:"+msg);
  		sb.append("\r\n");
  	}
  	public String getErrorMessage(){
  		if(sb==null){
  			return null;
  		}
  		return sb.toString();
  	}
  }
  