001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 package org.apache.hadoop.mapred; 019 020 import java.io.IOException; 021 import java.util.List; 022 import java.util.Iterator; 023 024 import org.apache.hadoop.classification.InterfaceAudience; 025 import org.apache.hadoop.classification.InterfaceStability; 026 027 /** 028 * This class wraps a list of problems with the input, so that the user 029 * can get a list of problems together instead of finding and fixing them one 030 * by one. 031 */ 032 @InterfaceAudience.Public 033 @InterfaceStability.Stable 034 public class InvalidInputException extends IOException { 035 036 private static final long serialVersionUID = 1L; 037 private List<IOException> problems; 038 039 /** 040 * Create the exception with the given list. 041 * @param probs the list of problems to report. this list is not copied. 042 */ 043 public InvalidInputException(List<IOException> probs) { 044 problems = probs; 045 } 046 047 /** 048 * Get the complete list of the problems reported. 049 * @return the list of problems, which must not be modified 050 */ 051 public List<IOException> getProblems() { 052 return problems; 053 } 054 055 /** 056 * Get a summary message of the problems found. 057 * @return the concatenated messages from all of the problems. 058 */ 059 public String getMessage() { 060 StringBuffer result = new StringBuffer(); 061 Iterator<IOException> itr = problems.iterator(); 062 while(itr.hasNext()) { 063 result.append(itr.next().getMessage()); 064 if (itr.hasNext()) { 065 result.append("\n"); 066 } 067 } 068 return result.toString(); 069 } 070 }