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.fixed;
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.HashMap;
024 import java.util.Iterator;
025 import java.util.List;
026 import java.util.Map;
027 import java.util.Scanner;
028
029 import org.apache.camel.Exchange;
030 import org.apache.camel.dataformat.bindy.BindyFixedLengthFactory;
031 import org.apache.camel.dataformat.bindy.util.Converter;
032 import org.apache.camel.spi.DataFormat;
033 import org.apache.camel.spi.PackageScanClassResolver;
034 import org.apache.camel.util.IOHelper;
035 import org.apache.camel.util.ObjectHelper;
036 import org.apache.commons.logging.Log;
037 import org.apache.commons.logging.LogFactory;
038
039 /**
040 * A <a href="http://camel.apache.org/data-format.html">data format</a> (
041 * {@link DataFormat}) using Bindy to marshal to and from Fixed Length
042 */
043 public class BindyFixedLengthDataFormat implements DataFormat {
044 private static final transient Log LOG = LogFactory.getLog(BindyFixedLengthDataFormat.class);
045
046 private String[] packages;
047 private BindyFixedLengthFactory modelFactory;
048
049 public BindyFixedLengthDataFormat() {
050 }
051
052 public BindyFixedLengthDataFormat(String... packages) {
053 this.packages = packages;
054 }
055
056 @SuppressWarnings("unchecked")
057 public void marshal(Exchange exchange, Object body, OutputStream outputStream) throws Exception {
058
059 BindyFixedLengthFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
060 ObjectHelper.notNull(factory, "not instantiated");
061
062 // Get CRLF
063 byte[] bytesCRLF = Converter.getByteReturn(factory.getCarriageReturn());
064
065 List<Map<String, Object>> models;
066
067 // the body is not a prepared list so help a bit here and create one for us
068 if (exchange.getContext().getTypeConverter().convertTo(List.class, body) == null) {
069 models = new ArrayList<Map<String, Object>>();
070 Iterator it = ObjectHelper.createIterator(body);
071 while (it.hasNext()) {
072 Object model = it.next();
073 String name = model.getClass().getName();
074 Map<String, Object> row = new HashMap<String, Object>();
075 row.put(name, body);
076 models.add(row);
077 }
078 } else {
079 // cast to the expected type
080 models = (List<Map<String, Object>>) body;
081 }
082
083 for (Map<String, Object> model : models) {
084
085 String result = factory.unbind(model);
086
087 byte[] bytes = exchange.getContext().getTypeConverter().convertTo(byte[].class, exchange, result);
088 outputStream.write(bytes);
089
090 // Add a carriage return
091 outputStream.write(bytesCRLF);
092 }
093 }
094
095 public Object unmarshal(Exchange exchange, InputStream inputStream) throws Exception {
096 BindyFixedLengthFactory factory = getFactory(exchange.getContext().getPackageScanClassResolver());
097 ObjectHelper.notNull(factory, "not instantiated");
098
099 // List of Pojos
100 List<Map<String, Object>> models = new ArrayList<Map<String, Object>>();
101
102 // Pojos of the model
103 Map<String, Object> model;
104
105 InputStreamReader in = new InputStreamReader(inputStream);
106
107 // Scanner is used to read big file
108 Scanner scanner = new Scanner(in);
109
110 int count = 0;
111
112 try {
113
114 // TODO Test if we have a Header
115 // TODO Test if we have a Footer (containing by example checksum)
116
117 while (scanner.hasNextLine()) {
118 String line;
119
120 // Read the line (should not trim as its fixed length)
121 line = scanner.nextLine();
122
123 if (ObjectHelper.isEmpty(line)) {
124 // skip if line is empty
125 continue;
126 }
127
128 // Increment counter
129 count++;
130
131 // Check if the record length corresponds to the parameter
132 // provided in the @FixedLengthRecord
133 if ((line.length() < factory.recordLength()) || (line.length() > factory.recordLength())) {
134 throw new java.lang.IllegalArgumentException("Size of the record : " + line.length() + " is not equal to the value provided in the model : " + factory.recordLength() + " !");
135 }
136
137 // Create POJO where Fixed data will be stored
138 model = factory.factory();
139
140 // Bind data from Fixed record with model classes
141 factory.bind(line, model, count);
142
143 // Link objects together
144 factory.link(model);
145
146 // Add objects graph to the list
147 models.add(model);
148
149 if (LOG.isDebugEnabled()) {
150 LOG.debug("Graph of objects created : " + model);
151 }
152
153 }
154
155 // Test if models list is empty or not
156 // If this is the case (correspond to an empty stream, ...)
157 if (models.size() == 0) {
158 throw new java.lang.IllegalArgumentException("No records have been defined in the message !");
159 } else {
160 return models;
161 }
162
163 } finally {
164 scanner.close();
165 IOHelper.close(in, "in", LOG);
166 }
167
168 }
169
170 /**
171 * Method used to create the singleton of the BindyCsvFactory
172 */
173 public BindyFixedLengthFactory getFactory(PackageScanClassResolver resolver) throws Exception {
174 if (modelFactory == null) {
175 modelFactory = new BindyFixedLengthFactory(resolver, packages);
176 }
177 return modelFactory;
178 }
179
180 public void setModelFactory(BindyFixedLengthFactory modelFactory) {
181 this.modelFactory = modelFactory;
182 }
183
184 public String[] getPackages() {
185 return packages;
186 }
187
188 public void setPackages(String[] packages) {
189 this.packages = packages;
190 }
191
192 }