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 */ 017 018 package org.apache.camel.language.simple; 019 020 import java.text.SimpleDateFormat; 021 import java.util.Date; 022 023 import org.apache.camel.Exchange; 024 import org.apache.camel.Expression; 025 import org.apache.camel.builder.ExpressionBuilder; 026 import org.apache.camel.language.IllegalSyntaxException; 027 import org.apache.camel.language.constant.ConstantLanguage; 028 029 /** 030 * A helper class for working with <a href="http://activemq.apache.org/camel/expression.html">expressions</a> based 031 * on files. 032 * <p/> 033 * This expression expects the headers from the {@link FileLanguage} on the <b>IN</b> message. 034 * 035 * @see org.apache.camel.language.simple.FileLanguage 036 */ 037 public final class FileExpressionBuilder { 038 039 private FileExpressionBuilder() { 040 // Helper class 041 } 042 043 public static <E extends Exchange> Expression<E> fileNameExpression() { 044 return new Expression<E>() { 045 public Object evaluate(E exchange) { 046 return exchange.getIn().getHeader("CamelFileName", String.class); 047 } 048 049 @Override 050 public String toString() { 051 return "file:name"; 052 } 053 }; 054 } 055 056 public static <E extends Exchange> Expression<E> fileNameNoExtensionExpression() { 057 return new Expression<E>() { 058 public Object evaluate(E exchange) { 059 String name = exchange.getIn().getHeader("CamelFileName", String.class); 060 if (name.lastIndexOf(".") != -1) { 061 return name.substring(0, name.lastIndexOf('.')); 062 } else { 063 // name does not have extension 064 return name; 065 } 066 } 067 068 @Override 069 public String toString() { 070 return "file:name.noext"; 071 } 072 }; 073 } 074 075 public static <E extends Exchange> Expression<E> fileParentExpression() { 076 return new Expression<E>() { 077 public Object evaluate(E exchange) { 078 return exchange.getIn().getHeader("CamelFileParent", String.class); 079 } 080 081 @Override 082 public String toString() { 083 return "file:parent"; 084 } 085 }; 086 } 087 088 public static <E extends Exchange> Expression<E> filePathExpression() { 089 return new Expression<E>() { 090 public Object evaluate(E exchange) { 091 return exchange.getIn().getHeader("CamelFilePath", String.class); 092 } 093 094 @Override 095 public String toString() { 096 return "file:path"; 097 } 098 }; 099 } 100 101 public static <E extends Exchange> Expression<E> fileAbsolutePathExpression() { 102 return new Expression<E>() { 103 public Object evaluate(E exchange) { 104 return exchange.getIn().getHeader("CamelFileAbsolutePath", String.class); 105 } 106 107 @Override 108 public String toString() { 109 return "file:absolute.path"; 110 } 111 }; 112 } 113 114 public static <E extends Exchange> Expression<E> fileCanoicalPathExpression() { 115 return new Expression<E>() { 116 public Object evaluate(E exchange) { 117 return exchange.getIn().getHeader("CamelFileCanonicalPath", String.class); 118 } 119 120 @Override 121 public String toString() { 122 return "file:canonical.path"; 123 } 124 }; 125 } 126 127 public static <E extends Exchange> Expression<E> fileSizeExpression() { 128 return new Expression<E>() { 129 public Object evaluate(E exchange) { 130 return exchange.getIn().getHeader("CamelFileLength", Long.class); 131 } 132 133 @Override 134 public String toString() { 135 return "file:length"; 136 } 137 }; 138 } 139 140 public static <E extends Exchange> Expression<E> dateExpression(final String command, final String pattern) { 141 return new Expression<E>() { 142 public Object evaluate(E exchange) { 143 if ("file".equals(command)) { 144 Date date = exchange.getIn().getHeader("CamelFileLastModified", Date.class); 145 if (date != null) { 146 SimpleDateFormat df = new SimpleDateFormat(pattern); 147 return df.format(date); 148 } else { 149 return null; 150 } 151 } 152 // must call evaluate to return the nested language evaluate when evaluating 153 // stacked expressions 154 return ExpressionBuilder.dateExpression(command, pattern).evaluate(exchange); 155 } 156 157 @Override 158 public String toString() { 159 return "date(" + command + ":" + pattern + ")"; 160 } 161 }; 162 } 163 164 public static <E extends Exchange> Expression<E> simpleExpression(final String simple) { 165 return new Expression<E>() { 166 public Object evaluate(E exchange) { 167 // must call evaluate to return the nested language evaluate when evaluating 168 // stacked expressions 169 try { 170 return SimpleLanguage.simple(simple).evaluate(exchange); 171 } catch (IllegalSyntaxException e) { 172 // fallback to constant so end users can enter a fixed filename 173 return ConstantLanguage.constant(simple).evaluate(exchange); 174 } 175 } 176 177 @Override 178 public String toString() { 179 return "simple(" + simple + ")"; 180 } 181 }; 182 } 183 184 }