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.HashMap;
025 import java.util.Iterator;
026 import java.util.List;
027 import java.util.Map;
028 import java.util.Scanner;
029
030 import org.apache.camel.Exchange;
031 import org.apache.camel.dataformat.bindy.BindyAbstractDataFormat;
032 import org.apache.camel.dataformat.bindy.BindyAbstractFactory;
033 import org.apache.camel.dataformat.bindy.BindyCsvFactory;
034 import org.apache.camel.dataformat.bindy.BindyKeyValuePairFactory;
035 import org.apache.camel.dataformat.bindy.util.Converter;
036 import org.apache.camel.spi.DataFormat;
037 import org.apache.camel.spi.PackageScanClassResolver;
038 import org.apache.camel.util.IOHelper;
039 import org.apache.camel.util.ObjectHelper;
040 import org.apache.commons.logging.Log;
041 import org.apache.commons.logging.LogFactory;
042
043 /**
044 * A <a href="http://camel.apache.org/data-format.html">data format</a> (
045 * {@link DataFormat}) using Bindy to marshal to and from CSV files
046 */
047 public class BindyCsvDataFormat extends BindyAbstractDataFormat {
048 private static final transient Log LOG = LogFactory.getLog(BindyCsvDataFormat.class);
049
050 public BindyCsvDataFormat() {
051 }
052
053 public BindyCsvDataFormat(String... packages) {
054 super(packages);
055 }
056
057 @SuppressWarnings("unchecked")
058 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
059
060 BindyCsvFactory factory = (BindyCsvFactory)getFactory(exchange.getContext().getPackageScanClassResolver());
061 ObjectHelper.notNull(factory, "not instantiated");
062
063 // Get CRLF
064 byte[] bytesCRLF = Converter.getByteReturn(factory.getCarriageReturn());
065
066 if (factory.getGenerateHeaderColumnNames()) {
067
068 String result = factory.generateHeader();
069 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
070 outputStream.write(bytes);
071
072 // Add a carriage return
073 outputStream.write(bytesCRLF);
074 }
075
076 List<Map<String, Object>> models;
077
078 // the body is not a prepared list so help a bit here and create one for us
079 if (exchange.getContext().getTypeConverter().convertTo(List.class, body) == null) {
080 models = new ArrayList<Map<String, Object>>();
081 Iterator it = ObjectHelper.createIterator(body);
082 while (it.hasNext()) {
083 Object model = it.next();
084 String name = model.getClass().getName();
085 Map<String, Object> row = new HashMap<String, Object>();
086 row.put(name, body);
087 models.add(row);
088 }
089 } else {
090 // cast to the expected type
091 models = (List<Map<String, Object>>) body;
092 }
093
094 for (Map<String, Object> model : models) {
095
096 String result = factory.unbind(model);
097
098 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
099 outputStream.write(bytes);
100
101 // Add a carriage return
102 outputStream.write(bytesCRLF);
103 }
104 }
105
106 public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
107 BindyCsvFactory factory = (BindyCsvFactory)getFactory(exchange.getContext().getPackageScanClassResolver());
108 ObjectHelper.notNull(factory, "not instantiated");
109
110 // List of Pojos
111 List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
112
113 // Pojos of the model
114 Map<String, Object> model;
115
116 InputStreamReader in = new InputStreamReader(inputStream);
117
118 // Scanner is used to read big file
119 Scanner scanner = new Scanner(in);
120
121 // Retrieve the separator defined to split the record
122 String separator = factory.getSeparator();
123 ObjectHelper.notNull(separator, "The separator has not been defined in the annotation @CsvRecord or not instantiated during initModel.");
124
125 int count = 0;
126 try {
127 // If the first line of the CSV file contains columns name, then we
128 // skip this line
129 if (factory.getSkipFirstLine()) {
130 // Check if scanner is empty
131 if (scanner.hasNextLine()) {
132 scanner.nextLine();
133 }
134 }
135
136 while (scanner.hasNextLine()) {
137
138 // Read the line
139 String line = scanner.nextLine().trim();
140
141 if (ObjectHelper.isEmpty(line)) {
142 // skip if line is empty
143 continue;
144 }
145
146 // Increment counter
147 count++;
148
149 // Create POJO where CSV data will be stored
150 model = factory.factory();
151
152 // Split the CSV record according to the separator defined in
153 // annotated class @CSVRecord
154 String[] tokens = line.split(separator, -1);
155 List<String> result = Arrays.asList(tokens);
156 // must unquote tokens before use
157 result = unquoteTokens(result);
158
159 if (result.size() == 0 || result.isEmpty()) {
160 throw new java.lang.IllegalArgumentException("No records have been defined in the CSV !");
161 }
162
163 if (result.size() > 0) {
164
165 if (LOG.isDebugEnabled()) {
166 LOG.debug("Size of the record splitted : " + result.size());
167 }
168
169 // Bind data from CSV record with model classes
170 factory.bind(result, model, count);
171
172 // Link objects together
173 factory.link(model);
174
175 // Add objects graph to the list
176 models.add(model);
177
178 if (LOG.isDebugEnabled()) {
179 LOG.debug("Graph of objects created : " + model);
180 }
181
182 }
183
184 }
185
186 // Test if models list is empty or not
187 // If this is the case (correspond to an empty stream, ...)
188 if (models.size() == 0) {
189 throw new java.lang.IllegalArgumentException("No records have been defined in the CSV !");
190 } else {
191 return models;
192 }
193
194 } finally {
195 scanner.close();
196 IOHelper.close(in, "in", LOG);
197 }
198
199 }
200
201 /**
202 * Unquote the tokens, by removing leading and trailing quote chars
203 */
204 private List<String> unquoteTokens(List<String> result) {
205 List<String> answer = new ArrayList<String>(result.size());
206 for (String s : result) {
207 if (s.startsWith("\"") || s.startsWith("'")) {
208 s = s.substring(1);
209 }
210 if (s.endsWith("\"") || s.endsWith("'")) {
211 s = s.substring(0, s.length() - 1);
212 }
213 answer.add(s);
214 }
215 return answer;
216 }
217
218 protected BindyAbstractFactory createModelFactory(PackageScanClassResolver resolver) throws Exception {
219 return new BindyCsvFactory(resolver, getPackages());
220 }
221 }