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 */ 017 package org.apache.camel.language.simple; 018 019 import org.apache.camel.Expression; 020 import org.apache.camel.component.file.FileExchange; 021 import org.apache.camel.language.IllegalSyntaxException; 022 import org.apache.camel.util.ObjectHelper; 023 024 /** 025 * File language is an extension to Simple language to add file specific expressions. 026 * 027 * Examples of supported file expressions are: 028 * <ul> 029 * <li><tt>file:name</tt> to access the file name</li> 030 * <li><tt>file:name.noext</tt> to access the file name with no extension</li> 031 * <li><tt>file:parent</tt> to access the parent file name</li> 032 * <li><tt>file:path</tt> to access the file path name</li> 033 * <li><tt>file:absolute.path</tt> to access the absolute file path name</li> 034 * <li><tt>file:canonical.path</tt> to access the canonical path name</li> 035 * <li><tt>file:length</tt> to access the file length as a Long type</li> 036 * <li><tt>date:<command>:<pattern></tt> for date formatting using the {@link java.text.SimpleDateFormat} patterns. 037 * Additional Supported commands are: <tt>file</tt> for the last modified timestamp of the file. 038 * All the commands from {@link SimpleLanguage} is also avaiable. 039 * </li> 040 * </ul> 041 * All the simple expression is also available so you can eg use <tt>${in.header.foo}</tt> to access the foo header. 042 * 043 * @see org.apache.camel.language.simple.SimpleLanguage 044 * @see org.apache.camel.language.bean.BeanLanguage 045 */ 046 public class FileLanguage extends AbstractSimpleLanguage { 047 048 public static Expression file(String expression) { 049 FileLanguage language = new FileLanguage(); 050 return language.createExpression(expression); 051 } 052 053 protected Expression<FileExchange> createSimpleExpression(String expression) { 054 055 // file: prefix 056 String remainder = ifStartsWithReturnRemainder("file:", expression); 057 if (remainder != null) { 058 if (ObjectHelper.equal(remainder, "name")) { 059 return FileExpressionBuilder.fileNameExpression(); 060 } else if (ObjectHelper.equal(remainder, "name.noext")) { 061 return FileExpressionBuilder.fileNameNoExtensionExpression(); 062 } else if (ObjectHelper.equal(remainder, "parent")) { 063 return FileExpressionBuilder.fileParentExpression(); 064 } else if (ObjectHelper.equal(remainder, "path")) { 065 return FileExpressionBuilder.filePathExpression(); 066 } else if (ObjectHelper.equal(remainder, "absolute.path")) { 067 return FileExpressionBuilder.fileAbsolutePathExpression(); 068 } else if (ObjectHelper.equal(remainder, "canonical.path")) { 069 return FileExpressionBuilder.fileCanoicalPathExpression(); 070 } else if (ObjectHelper.equal(remainder, "length")) { 071 return FileExpressionBuilder.fileSizeExpression(); 072 } 073 } 074 075 // date: prefix 076 remainder = ifStartsWithReturnRemainder("date:", expression); 077 if (remainder != null) { 078 String[] parts = remainder.split(":"); 079 if (parts.length != 2) { 080 throw new IllegalSyntaxException(this, expression + " ${date:command:pattern} is the correct syntax."); 081 } 082 String command = parts[0]; 083 String pattern = parts[1]; 084 return FileExpressionBuilder.dateExpression(command, pattern); 085 } 086 087 // fallback to simple language if not file specific 088 return FileExpressionBuilder.simpleExpression(expression); 089 } 090 091 }