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;
018    
019    import org.apache.camel.Converter;
020    import org.apache.camel.Exchange;
021    import org.apache.camel.FallbackConverter;
022    import org.apache.camel.TypeConverter;
023    import org.apache.camel.spi.TypeConverterRegistry;
024    
025    /**
026     * A set of converter methods for working with generic file types
027     */
028    @Converter
029    public final class GenericFileConverter {
030    
031        private GenericFileConverter() {
032            // Helper Class
033        }
034    
035        @FallbackConverter
036        public static Object convertTo(Class<?> type, Exchange exchange, Object value, TypeConverterRegistry registry) {
037            // use a fallback type converter so we can convert the embedded body if the value is GenericFile
038            if (GenericFile.class.isAssignableFrom(value.getClass())) {
039    
040                GenericFile<?> file = (GenericFile<?>) value;
041                Class<?> from = file.getBody().getClass();
042    
043                // maybe from is already the type we want
044                if (from.isAssignableFrom(type)) {
045                    return file.getBody();
046                }
047    
048                // no then try to lookup a type converter
049                TypeConverter tc = registry.lookup(type, from);
050                if (tc != null) {
051                    Object body = file.getBody();
052                    return tc.convertTo(type, exchange, body);
053                }
054            }
055            
056            return null;
057        }
058    
059        @Converter
060        public static String convertToString(GenericFile<?> file, Exchange exchange) {
061            if (exchange != null) {
062                return exchange.getContext().getTypeConverter().convertTo(String.class, exchange, file.getBody());
063            } else {
064                // should revert to fallback converter if we don't have an exchange
065                return null;
066            }
067        }
068    }