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 != null) { 061 return name.substring(0, name.lastIndexOf('.')); 062 } else { 063 return null; 064 } 065 } 066 067 @Override 068 public String toString() { 069 return "file:name.noext"; 070 } 071 }; 072 } 073 074 public static <E extends Exchange> Expression<E> fileParentExpression() { 075 return new Expression<E>() { 076 public Object evaluate(E exchange) { 077 return exchange.getIn().getHeader("CamelFileParent", String.class); 078 } 079 080 @Override 081 public String toString() { 082 return "file:parent"; 083 } 084 }; 085 } 086 087 public static <E extends Exchange> Expression<E> filePathExpression() { 088 return new Expression<E>() { 089 public Object evaluate(E exchange) { 090 return exchange.getIn().getHeader("CamelFilePath", String.class); 091 } 092 093 @Override 094 public String toString() { 095 return "file:path"; 096 } 097 }; 098 } 099 100 public static <E extends Exchange> Expression<E> fileAbsolutePathExpression() { 101 return new Expression<E>() { 102 public Object evaluate(E exchange) { 103 return exchange.getIn().getHeader("CamelFileAbsolutePath", String.class); 104 } 105 106 @Override 107 public String toString() { 108 return "file:absolute.path"; 109 } 110 }; 111 } 112 113 public static <E extends Exchange> Expression<E> fileCanoicalPathExpression() { 114 return new Expression<E>() { 115 public Object evaluate(E exchange) { 116 return exchange.getIn().getHeader("CamelFileCanonicalPath", String.class); 117 } 118 119 @Override 120 public String toString() { 121 return "file:canonical.path"; 122 } 123 }; 124 } 125 126 public static <E extends Exchange> Expression<E> fileSizeExpression() { 127 return new Expression<E>() { 128 public Object evaluate(E exchange) { 129 return exchange.getIn().getHeader("CamelFileLength", Long.class); 130 } 131 132 @Override 133 public String toString() { 134 return "file:length"; 135 } 136 }; 137 } 138 139 public static <E extends Exchange> Expression<E> dateExpression(final String command, final String pattern) { 140 return new Expression<E>() { 141 public Object evaluate(E exchange) { 142 if ("file".equals(command)) { 143 Date date = exchange.getIn().getHeader("CamelFileLastModified", Date.class); 144 if (date != null) { 145 SimpleDateFormat df = new SimpleDateFormat(pattern); 146 return df.format(date); 147 } else { 148 return null; 149 } 150 } 151 // must call evaluate to return the nested language evaluate when evaluating 152 // stacked expressions 153 return ExpressionBuilder.dateExpression(command, pattern).evaluate(exchange); 154 } 155 156 @Override 157 public String toString() { 158 return "date(" + command + ":" + pattern + ")"; 159 } 160 }; 161 } 162 163 public static <E extends Exchange> Expression<E> simpleExpression(final String simple) { 164 return new Expression<E>() { 165 public Object evaluate(E exchange) { 166 // must call evaluate to return the nested language evaluate when evaluating 167 // stacked expressions 168 try { 169 return SimpleLanguage.simple(simple).evaluate(exchange); 170 } catch (IllegalSyntaxException e) { 171 // fallback to constant so end users can enter a fixed filename 172 return ConstantLanguage.constant(simple).evaluate(exchange); 173 } 174 } 175 176 @Override 177 public String toString() { 178 return "simple(" + simple + ")"; 179 } 180 }; 181 } 182 183 }