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.component.file.strategy;
018    
019    import java.io.File;
020    
021    import org.apache.camel.Expression;
022    import org.apache.camel.component.file.FileExchange;
023    
024    /**
025     * File renamed using {@link Expression} to dynamically compute the file name.
026     * <p/>
027     * If most cases the {@link org.apache.camel.language.simple.FileLanguage FileLanguage} is used to
028     * create the expressions.
029     */
030    public class FileExpressionRenamer implements FileRenamer {
031    
032        private static final boolean ON_WINDOWS = System.getProperty("os.name").startsWith("Windows");
033    
034        private Expression expression;
035    
036        public File renameFile(FileExchange exchange, File file) {
037            if (expression == null) {
038                throw new IllegalArgumentException("Expression is not set");
039            }
040            File parent = file.getParentFile();
041    
042            Object result = expression.evaluate(exchange);
043            String name = exchange.getContext().getTypeConverter().convertTo(String.class, result);
044    
045            if (ON_WINDOWS && (name.indexOf(":") >= 0 || name.startsWith("//"))) {
046                return new File(name);
047            }
048            return new File(parent, name);
049        }
050    
051        public Expression getExpression() {
052            return expression;
053        }
054    
055        public void setExpression(Expression expression) {
056            this.expression = expression;
057        }
058    }