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.dataformat.bindy.csv;
018
019 import java.io.InputStream;
020 import java.io.InputStreamReader;
021 import java.io.OutputStream;
022 import java.util.ArrayList;
023 import java.util.Arrays;
024 import java.util.List;
025 import java.util.Map;
026 import java.util.Scanner;
027
028 import org.apache.camel.Exchange;
029 import org.apache.camel.dataformat.bindy.BindyCsvFactory;
030 import org.apache.camel.dataformat.bindy.util.Converter;
031 import org.apache.camel.spi.DataFormat;
032 import org.apache.camel.spi.PackageScanClassResolver;
033 import org.apache.camel.util.ObjectHelper;
034 import org.apache.commons.logging.Log;
035 import org.apache.commons.logging.LogFactory;
036
037 /**
038 * A <a href="http://camel.apache.org/data-format.html">data format</a>
039 * ({@link DataFormat}) using Bindy to marshal to and from CSV files
040 */
041 public class BindyCsvDataFormat implements DataFormat {
042 private static final transient Log LOG = LogFactory.getLog(BindyCsvDataFormat.class);
043
044 private String packageName;
045 private BindyCsvFactory modelFactory;
046
047 public BindyCsvDataFormat() {
048 }
049
050 public BindyCsvDataFormat(String packageName) {
051 this.packageName = packageName;
052 }
053
054 @SuppressWarnings("unchecked")
055 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
056
057 BindyCsvFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
058 List<Map<String, Object>> models = (ArrayList<Map<String, Object>>) body;
059 byte[] bytesCRLF;
060
061 // Get CRLF
062 bytesCRLF = Converter.getByteReturn(factory.getCarriageReturn());
063
064 for (Map<String, Object> model : models) {
065 String result = factory.unbind(model);
066 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
067 outputStream.write(bytes);
068
069 // Add a carriage return
070 outputStream.write(bytesCRLF);
071 }
072 }
073
074 public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
075 BindyCsvFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
076
077 // List of Pojos
078 List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
079
080 // Pojos of the model
081 Map<String, Object> model;
082
083 InputStreamReader in = new InputStreamReader(inputStream);
084
085 // Scanner is used to read big file
086 Scanner scanner = new Scanner(in);
087
088 // Retrieve the separator defined to split the record
089 String separator = factory.getSeparator();
090 ObjectHelper.notEmpty(separator, "The separator has not been defined in the annotation @Record or not instantiated during initModel.");
091
092 int count = 0;
093 try {
094
095 // If the first line of the CSV file contains columns name, then we skip this line
096 if (factory.getSkipFirstLine()) {
097 scanner.nextLine();
098 }
099
100 while (scanner.hasNextLine()) {
101
102 // Read the line
103 String line = scanner.nextLine().trim();
104
105 if (ObjectHelper.isEmpty(line)) {
106 // skip if line is empty
107 continue;
108 }
109
110 if (LOG.isDebugEnabled()) {
111 LOG.debug("Counter " + count++ + " : content : " + line);
112 }
113
114 // Create POJO where CSV data will be stored
115 model = factory.factory();
116
117 // Split the CSV record according to the separator defined in
118 // annotated class @CSVRecord
119 List<String> result = Arrays.asList(line.split(separator));
120
121 // Bind data from CSV record with model classes
122 factory.bind(result, model);
123
124 // Link objects together
125 factory.link(model);
126
127 // Add objects graph to the list
128 models.add(model);
129
130 if (LOG.isDebugEnabled()) {
131 LOG.debug("Graph of objects created : " + model);
132 }
133
134 }
135
136 return models;
137
138 } finally {
139 scanner.close();
140 ObjectHelper.close(in, "in", LOG);
141 }
142
143 }
144
145 /**
146 * Method used to create the singleton of the BindyCsvFactory
147 */
148 public BindyCsvFactory getFactory(PackageScanClassResolver resolver) throws Exception {
149 if (modelFactory == null) {
150 modelFactory = new BindyCsvFactory(resolver, packageName);
151 }
152 return modelFactory;
153 }
154
155 public void setModelFactory(BindyCsvFactory modelFactory) {
156 this.modelFactory = modelFactory;
157 }
158
159 public String getPackageName() {
160 return packageName;
161 }
162
163 public void setPackageName(String packageName) {
164 this.packageName = packageName;
165 }
166
167 }