001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel; 018 019/** 020 * An exception caused when a mandatory header is not available on a message 021 * {@link Exchange} 022 * 023 * @see org.apache.camel.support.ExchangeHelper#getMandatoryHeader(Exchange, String, Class) 024 */ 025public class NoSuchHeaderException extends CamelExchangeException { 026 027 private final String headerName; 028 private final transient Class<?> type; 029 030 public NoSuchHeaderException(Exchange exchange, String headerName, Class<?> type) { 031 super("No '" + headerName + "' header available of type: " + type.getName() 032 + reason(exchange, headerName), exchange); 033 this.headerName = headerName; 034 this.type = type; 035 } 036 037 public String getHeaderName() { 038 return headerName; 039 } 040 041 public Class<?> getType() { 042 return type; 043 } 044 045 protected static String reason(Exchange exchange, String propertyName) { 046 Object value = exchange.getProperty(propertyName); 047 return valueDescription(value); 048 } 049 050 static String valueDescription(Object value) { 051 if (value == null) { 052 return ""; 053 } 054 return " but has value: " + value + " of type: " + value.getClass().getCanonicalName(); 055 } 056}